Topicwise-Solutions-To-Coding-Questions

Solutions to the algorithmic problems in LeetCode, GeeksForGeeks, Hackerrank, Interviewbit and Codeforces written in C++ and JAVA

What you can find in this repository

We have solved quite a number of problems from several topics. See the below table for further details.

How to contribute?

1. Fork the repository
2. Do the desired changes (add/delete/modify)
3. Make a pull request

If you want to update the readme file as well, you have to install Java and Jsoup. Then you can run the UpdateReadme.java file to update the readme file.

When to contribute?

1. If there is no solution to a problem in the main branch
2. If your solution is asymptotically faster than the one in the main branch
3. If your algorithm is of the same time complexity but with reduced code size (In this case, comment out the original solution and make a pull request with your solution.)
4. If you have another method of solving the problem which is asymptotically slower than the original method (In this case, comment your solution in the main file and make a pull request.)
5. If you want to update the UpdateReadme.java file

Format for solution files

1. Paste the link for the question within comments.
2. Paste the solution.
3. Save with proper extension name.

Description of auto-updation of Readme file

UpdateReadme.java is the main file. It reads information (that are obtained online) from OnlineInfo.csv file. If you have updated the readme file with some online information without adding into csv file, then you need to run OnlineToCSV.java file to read that from readme and store in the csv file.

For difficulty level, csv file is already updated. For other online information columns you'll have to update it.

Algorithms

Number of Problems Solved (21-May-2023 11:22:31)

Topic Name	Java	CPP	Python
Arrays	123	75	0
BackTracking	35	16	0
Bit-Magic	32	23	0
Codeforces	76	1	0
Concurrency	6	0	0
Disjoint-Set	6	1	0
Dynamic-Programming	173	87	2
Graph	93	50	1
Greedy	60	19	0
Hashing	75	23	0
Heap	35	13	0
Linked-List	67	42	0
Matrix	56	27	0
Miscellaneous	135	12	0
Queue	12	6	0
Recursion	14	13	0
Searching	55	36	0
Segment-Tree	4	0	0
Sorting	19	7	0
Stack	33	18	1
Strings	118	47	0
Tree	177	88	0
Trie	18	13	0
Total	1422	617	4

Reference

• C++
  • STL Time Complexity (Detailed)
  • STL Time Complexity (Summary)
  • Data Structure and Algorithms Cheat Sheet
• JAVA
  • Time Complexity

Arrays

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Rearrange Array Alternately 1587115620	GFG	Java	Medium	O(n)
2	3sum With Multiplicity	LC	Java		O(n2)
3	Arithmetic Sequences	BS	CPP Java		O(n2)
4	Bulk Shift Letters	BS	CPP		O(1)
5	Compressed Vector Product	BS	CPP		O(1)
6	Dropped Sensor Metric	BS	CPP		O(1)
7	K Distinct Window	BS	Java		O(n)
8	Largest Sublist Sum	BS LC GFG	CPP Java	Medium	O(1)
9	Largest And Smallest Difference	BS	Java		O(n)
10	Majority Vote	BS LC	Java		O(n)
11	Maximum Absolute Value Of Sublist	BS LC	CPP Java		O(1)
12	Number Of K Length Sublists With Average At Least Target	BS	Java		O(n)
13	Rain Catcher	BS LC	Java		O(n)
14	Remove Duplicates Occurring More Than Twice	BS LC	CPP Java		O(1)
15	Set Split	BS	Java		O(n2)
16	Split String With Same Distinct Counts	BS LC	Java		O(n)
17	Submajority Vote	BS LC	Java		O(n)
18	XOR Range Queries	BS	Java		O(n)
19	Array Of Alternate Ve And Ve Nos1401	GFG	CPP Java	Easy	O(n2)
20	Bag Of Tokens	LC	Java		O(n)
21	Best Time To Buy And Sell Stock	LC	CPP		O(1)
22	Best Time To Buy And Sell Stock Ii	LC GFG	Java	Medium	O(n)
23	Binary Subarrays With Sum	LC	Java		O(n)
24	Boats To Save People	LC	Java		O(n)
25	Brick Wall	LC	Java		O(n2)
26	Chocolate Distribution Problem3825	GFG	Java	Easy	O(n)
27	Common Elements1132	GFG	CPP Java	Easy	O(n)
28	Contiguous Array	LC	CPP Java		O(n)
29	Count Number Of Bad Pairs	LC	CPP		O(1)
30	Count Number Of Nice Subarrays	LC	Java		O(n)
31	Count Pairs With Given Sum5022	GFG	Java	Easy	O(n)
32	Count Smaller Elements2214	GFG	Java	null	O(n)
33	Count Subarrays With Equal Number Of 1s And 0s 1587115620	GFG	CPP Java	Medium	O(1)
34	Count Subarrays With Score Less Than K	LC	Java		O(n2)
35	Count The Subarrays Having Product Less Than K1708	GFG	Java	Hard	O(n2)
36	Crush	HR	Java		O(n)
37	Cyclically Rotate An Array By One2614	GFG	CPP Java	Basic	O(1)
38	Distinct Absolute Array Elements4529	GFG	CPP Java	Easy	O(n2)
39	Factorials Of Large Numbers2508	GFG	CPP Java	Medium	O(1)
40	Find All Good Indices	LC	Java		O(n)
41	Find Good Days To Rob The Bank	LC	Java		O(n)
42	Find In Mountain Array	LC	Java		O(n)
43	Find Missing Observations	LC	CPP Java		O(n)
44	Find Pivot Index	LC GFG	CPP Java	Easy	O(n)
45	Find Target Indices After Sorting Array	LC	Java		O(n)
46	Find The Duplicate Number	LC	CPP Java		O(n)
47	Fruit Into Baskets	LC	Java		O(n2)
48	Greatest English Letter In Upper And Lower Case	LC	CPP		O(n2)
49	Insert Interval	LC	CPP Java		O(n)
50	Intersection Of Two Arrays Ii	LC LC GFG	CPP Java	Easy	O(1)
51	Interval List Intersections	LC	Java		O(n)
52	Inversion Of Array 1587115620	GFG	Java	Medium	O(n)
53	Jump Game	GFG	Java	Medium	O(n)
54	K Divisible Elements Subarrays	LC	Java		O(n)
55	Kth Smallest Element5635	GFG	CPP Java	Medium	O(1)
56	Large Factorial4721	GFG	CPP Java	Medium	O(1)
57	Largest Number Formed From An Array1117	GFG	Java	Medium	O(n)
58	Leaders In An Array 1587115620	GFG	CPP Java	Easy	O(1)
59	Longest Consecutive Sequence	LC GFG	CPP Java	Medium	O(1)
60	Longest Continuous Subarray With Absolute Diff Less Than Or Equal To Limit	LC	Java		O(n2)
61	Longest Mountain In Array	LC	Java		O(n2)
62	Longest Nice Subarray	LC	Java		O(n2)
63	Longest Subarray Of 1s After Deleting One Element	LC	Java		O(n2)
64	Majority Element	LC GFG	CPP	Medium	O(1)
65	Majority Element Ii	LC	CPP		O(1)
66	Make Array Zero By Subtracting Equal Amounts	LC	CPP		O(1)
67	Max Circular Subarray Sum 1587115620	GFG	Java	Hard	O(n2)
68	Max Consecutive Ones Iii	LC GFG	CPP Java	Medium	O(1)
69	Max Distance Between Same Elements	GFG	Java	Easy	O(n)
70	Max Sum Of A Pair With Equal Sum Of Digits	LC	CPP		O(1)
71	Max Sum Subarray Of Size K5313	GFG	CPP Java	Basic	O(1)
72	Maximum Ascending Subarray Sum	LC	Java		O(n)
73	Maximum Difference Of Zeros And Ones In Binary String4111	GFG	CPP Java	Easy	O(1)
74	Maximum Erasure Value	LC	Java		O(n2)
75	Maximum Index 1587115620	GFG	Java	Medium	O(n2)
76	Maximum Intervals Overlap5708	GFG	Java	null	O(n)
77	Maximum Number Of Pairs In Array	LC	CPP		O(1)
78	Maximum Points You Can Obtain From Cards	LC	CPP		O(1)
79	Maximum Product Subarray	LC GFG	CPP Java	Medium	O(1)
80	Maximum Product Subset Of An Array	GFG	Java	Medium	O(n)
81	Median Of Two Sorted Arrays	LC GFG	Java	Hard	O(n)
82	Merge Intervals	LC GFG	CPP Java	Medium	O(1)
83	Merge Similar Items	LC	CPP		O(1)
84	Merge Two Sorted Arrays5135	GFG	CPP Java	Hard	O(1)
85	Minimize Maximum Of Array	LC	Java		O(n)
86	Minimize Maximum Pair Sum In Array	LC	Java		O(n2)
87	Minimize The Heights3351	GFG	Java	Medium	O(n)
88	Minimum Number Of Jumps 1587115620	GFG	Java	Medium	O(n)
89	Minimum Size Subarray Sum	LC	CPP Java		O(1)
90	Move All Negative Elements To End1813	GFG	CPP Java	Easy	O(1)
91	Move Zeroes	LC	CPP Java		O(1)
92	Next Higher Palindromic Number Using The Same Set Of Digits5859	GFG	CPP Java	Medium	O(1)
93	Next Permutation	LC	CPP Java		O(1)
94	Non Decreasing Array	LC	Java		O(n)
95	Number Of Arithmetic Triplets	LC	CPP		O(1)
96	Number Of Good Ways To Split A String	LC	CPP		O(1)
97	Number Of Sub Arrays Of Size K And Average Greater Than Or Equal To Threshold	LC	CPP Java		O(1)
98	Number Of Subsequences That Satisfy The Given Sum Condition	LC	Java		O(n)
99	Number Of Zero Filled Subarrays	LC	CPP Java		O(1)
100	Pairs Of Songs With Total Durations Divisible By 60	LC	Java		O(n)
101	Palindrome String0817	GFG	Java	Easy	O(1)
102	Partition Array Into Three Parts With Equal Sum	LC	CPP Java		O(1)
103	Partition Array Such That Maximum Difference Is K	LC	Java		O(n)
104	Partitions	IB	Java		O(n2)
105	Pick From Both Sides	IB	Java		O(n)
106	Plus One	GFG	CPP Java	Easy	O(n)
107	Product Of Array Except Self	LC GFG	Java	null	O(1)
108	Product Of The Last K Numbers	LC	Java		O(n)
109	Push Dominoes	LC	Java		O(n2)
110	Rearrange An Array With O1 Extra Space3142	GFG	Java	Medium	O(n2)
111	Remove Duplicates From Sorted Array	LC	CPP Java		O(1)
112	Remove One Element To Make The Array Strictly Increasing	LC	CPP		O(1)
113	Replace Elements With Greatest Element On Right Side	LC	CPP Java		O(1)
114	Reverse An Array	GFG	CPP Java	School	O(1)
115	Rotate And Delete 1587115621	GFG	Java	Medium	O(n)
116	Rotate Array	LC	CPP Java		O(1)
117	Shortest Subarray With Sum At Least K	LC	CPP Java		O(1)
118	Shortest Unsorted Continuous Subarray	LC	CPP Java		O(1)
119	Smallest Subarray With Sum Greater Than X5651	GFG	CPP Java	null	O(1)
120	Smallest Subset With Greater Sum	GFG	Java	Easy	O(n)
121	Smallest Sum Contiguous Subarray	GFG	Java	Medium	O(n)
122	Sort An Array Of 0s 1s And 2s4231	GFG	CPP Java	Easy	O(1)
123	Sort Colors	LC	CPP Java		O(1)
124	Stickler Theif 1587115621	GFG	CPP	Easy	O(1)
125	Stock Buy And Sell 1587115621	GFG	CPP	Medium	O(1)
126	Subarray Product Less Than K	LC GFG	CPP	Hard	O(1)
127	Subarray Sum Equals K	LC	CPP Java		O(1)
128	Subarray With 0 Sum 1587115621	GFG	CPP Java	Easy	O(1)
129	Subarray With Given Sum 1587115621	GFG	CPP Java	Easy	O(1)
130	Subarrays With K Different Integers	LC	Java		O(n)
131	Sum Of Absolute Differences In A Sorted Array	LC	Java		O(n)
132	Sum Of All Odd Length Subarrays	LC	Java		O(n2)
133	Sum Of Middle Elements Of Two Sorted Arrays2305	GFG	Java	Medium	O(n)
134	Summary Ranges	LC	Java		O(n)
135	Three Way Partitioning	GFG	CPP Java	Easy	O(1)
136	Trapping Rain Water	LC	CPP		O(1)
137	Triplet Sum In Array 1587115621	GFG	CPP	Medium	O(1)
138	Union Of Two Arrays3538	GFG	CPP Java	Basic	O(1)
139	Union Of Two Sorted Arrays	GFG	CPP Java	Easy	O(1)
140	Unique Morse Code Words	LC	CPP		O(1)
141	Valid Triangle Number	LC	Java		O(n3)
142	Wave Array 1587115621	GFG	Java	Easy	O(n)
143	Ways To Make A Fair Array	LC	Java		O(n)
144	Zero Sum Subarrays1825	GFG	CPP Java	Medium	O(1)

BackTracking

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Additive Number	LC	Java		O(n)
2	All Unique Permutations Of An Array	GFG	Java	Medium	O(n2)
3	Binary Watch	LC	Java		O(1)
4	Combination Sum	LC GFG	CPP Java	Medium	O(n)
5	Combination Sum Ii	LC	CPP Java		O(n)
6	Combination Sum Iii	LC	CPP Java		O(n)
7	Combination Sum Iv	LC	CPP Java		O(n)
8	Count Number Of Maximum Bitwise Or Subsets	LC	Java		O(n)
9	Design Add And Search Words Data Structure	LC	Java		O(n2)
10	Fair Distribution Of Cookies	LC	Java		O(n)
11	Find Whether Path Exist5238	GFG	Java	Medium	O(n2)
12	Generate Parentheses	LC	CPP Java		O(n)
13	Largest Number In K Swaps 1587115620	GFG	Java	Medium	O(n2)
14	Minimum Genetic Mutation	LC	Java		O(n3)
15	N Queens	LC	Java		O(n2)
16	Non Decreasing Subsequences	LC	Java		O(n)
17	Number Of Paths0926	GFG	CPP Java	Easy	O(1)
18	Numbers With Same Consecutive Differences	LC	Java		O(n2)
19	Palindrome Partitioning	LC GFG	Java	Hard	O(n)
20	Palindrome Partitioning Ii	LC	Java		O(n)
21	Partition A Set Into Two Subsets Such That The Difference Of Subset Sums Is Minimum Set 2	GFG	Java	Hard	O(1)
22	Partition Array To K Subsets	GFG	Java	Hard	O(n)
23	Permutations	LC GFG	CPP Java	Easy	O(1)
24	Permutations Ii	LC	CPP Java		O(n)
25	Rat In A Maze Problem	GFG	CPP Java	Medium	O(1)
26	Remove Invalid Parentheses	LC	Java		O(n)
27	Restore Ip Addresses	LC GFG	CPP	Medium	O(1)
28	Split Array Into Fibonacci Sequence	LC	Java		O(n)
29	Subset Sums Between The Given Range	GFG	Java	Hard	O(n2)
30	Sudoku Solver	LC GFG	CPP Java	Hard	O(1)
31	Sum Of All Subset Xor Totals	LC	Java		O(1)
32	Travelling Salesman Problem2732	GFG	Java	Hard	O(n)
33	Unique Paths Iii	LC	CPP		O(1)
34	Word Break Ii	LC GFG	CPP Java	Hard	O(1)
35	Word Ladder Ii	LC GFG	CPP Java	null	O(1)
36	Word Search	LC	CPP Java		O(1)
37	Word Search Ii	LC	CPP Java		O(1)

Bit-Magic

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Longest Consecutive Run Of 1s In Binary	BS GFG	CPP Java	Easy	O(1)
2	Minimum Updates To Make Bitwise OR Equal To Target	BS	CPP Java		O(1)
3	Add Binary	LC	CPP Java		O(n)
4	Bit Difference 1587115620	GFG	CPP Java	Basic	O(n)
5	Bitwise Xor Of All Pairings	LC	Java		O(n)
6	Check Whether K Th Bit Is Set Or Not 1587115620	GFG	CPP Java	Easy	O(n)
7	Count Total Set Bits 1587115620	GFG	CPP Java	Medium	O(n)
8	Find Position Of Set Bit3706	GFG	CPP Java	Basic	O(1)
9	Find The Original Array Of Prefix Xor	LC	Java		O(n)
10	Finding The Numbers0215	GFG	Java	Easy	O(n)
11	Geek And Function V	GFG	Java	Easy	O(n2)
12	Jump Game	GFG	CPP	Medium	O(1)
13	Largest Combination With Bitwise And Greater Than Zero	LC	Java		O(n2)
14	Maximum Subset Xor	GFG	Java	Hard	O(n2)
15	Maximum Xor After Operations	LC	Java		O(n)
16	Minimize Xor	LC	Java		O(n)
17	Missing Number In Array1416	GFG	CPP Java	Easy	O(n2)
18	Nth Natural Number	GFG	CPP Java	Hard	O(1)
19	Number Of 1 Bits	LC	CPP Java		O(1)
20	Number Of Excellent Pairs	LC	Java		O(n)
21	Parallel Courses Ii	LC	CPP		O(1)
22	Permutation Sequence	LC	CPP Java		O(n)
23	Power Of Two	LC	CPP Java		O(1)
24	Reverse Bits	LC GFG	CPP Java	Easy	O(1)
25	Single Number	LC	CPP Java		O(n)
26	Single Number Iii	LC	CPP Java		O(1)
27	Sort By Set Bit Count1153	GFG	Java	Easy	O(n)
28	Sum Of Two Integers	LC	CPP Java		O(1)
29	Sum Of Two Numbers Without Using Arithmetic Operators	GFG	CPP Java	Easy	O(1)
30	Trailing Zeroes In Factorial5134	GFG	CPP Java	Easy	O(1)
31	Ugly Number	LC	CPP Java		O(1)
32	Ugly Number Ii	LC	CPP Java		O(1)
33	X Xor A Is Minimum And Set Bits In X B	GFG	Java	Hard	O(n)

Codeforces

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	112 A	CF	Java		O(n)
2	1141 B	CF	Java		O(n)
3	1144 B	CF	Java		O(n)
4	115 A	CF	Java		O(n)
5	1208 A	CF	Java		O(n)
6	1283 A	CF	Java		O(n)
7	129 A	CF	Java		O(n)
8	1294 A	CF	Java		O(n)
9	1296 B	CF	Java		O(n2)
10	1311 A	CF	Java		O(n)
11	1324 A	CF	Java		O(n2)
12	1325 B	CF	Java		O(n2)
13	1326 B	CF	Java		O(n)
14	1335 B	CF	Java		O(n2)
15	1337 B	CF	Java		O(n2)
16	1343 B	CF	Java		O(n2)
17	1350 A	CF	Java		O(n2)
18	1353 B	CF	Java		O(n2)
19	1367 B	CF	Java		O(n2)
20	1368 A	CF	Java		O(n2)
21	1370 A	CF	CPP Java		O(1)
22	1374 B	CF	Java		O(n)
23	1385 B	CF	Java		O(n2)
24	1401 A	CF	Java		O(n)
25	141 A	CF	Java		O(n)
26	1426 B	CF	Java		O(n4)
27	1430 A	CF	Java		O(n)
28	1462 C	CF	Java		O(n2)
29	1475 B	CF	Java		O(n)
30	148 A	CF	Java		O(n)
31	1525 B	CF	Java		O(n2)
32	1543 B	CF	Java		O(n2)
33	1559 B	CF	Java		O(n2)
34	1560 B	CF	Java		O(n)
35	158 A	CF	Java		O(1)
36	1607 H	CF	Java		O(n2)
37	1624 B	CF	Java		O(n)
38	200 B	CF	Java		O(n)
39	231 A	CF	Java		O(n)
40	236 A	CF	Java		O(n)
41	263 A	CF	Java		O(n2)
42	266 B	CF	Java		O(n2)
43	282 A	CF	Java		O(n)
44	318 A	CF	Java		O(1)
45	32 B	CF	Java		O(n)
46	320 A	CF	Java		O(n)
47	339 A	CF	Java		O(n)
48	34 B	CF	Java		O(n)
49	4 A	CF	Java		O(1)
50	41 A	CF	Java		O(n)
51	432 A	CF	Java		O(n)
52	439 A	CF	Java		O(n)
53	443 A	CF	Java		O(n)
54	469 A	CF	Java		O(n)
55	474 A	CF	Java		O(n)
56	490 A	CF	Java		O(n)
57	496 A	CF	Java		O(n)
58	50 A	CF	Java		O(1)
59	546 A	CF	Java		O(1)
60	580 A	CF	Java		O(n)
61	59 A	CF	Java		O(n)
62	617 A	CF	Java		O(1)
63	677 A	CF	Java		O(n)
64	702 A	CF	Java		O(n)
65	709 A	CF	Java		O(n)
66	71 A	CF	Java		O(n)
67	711 A	CF	Java		O(n)
68	732 A	CF	Java		O(1)
69	746 B	CF	Java		O(n)
70	749 A	CF	Java		O(n)
71	750 A	CF	Java		O(n)
72	768 A	CF	Java		O(n)
73	977 B	CF	Java		O(n)
74	978 B	CF	Java		O(n)
75	991 B	CF	Java		O(n)
76	999 B	CF	Java		O(n)

Concurrency

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Building H2o	LC	Java		O(1)
2	Fizz Buzz Multithreaded	LC	Java		O(n)
3	Print Foobar Alternately	LC	Java		O(n)
4	Print In Order	LC	Java		O(1)
5	Print Zero Even Odd	LC	Java		O(n)
6	The Dining Philosophers	LC	Java		O(n)

Disjoint-Set

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Accounts Merge	LC	Java		O(n)
2	Lexicographically Smallest Equivalent String	LC	Java		O(n)
3	Number Of Operations To Make Network Connected	LC	Java		O(n)
4	Number Of Provinces	LC GFG	Java	Medium	O(n3)
5	Redundant Connection	LC	Java		O(n)
6	Satisfiability Of Equality Equations	LC	Java		O(n)
7	Union Find	GFG	CPP	null	O(1)

Dynamic-Programming

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	0 1 Knapsack Problem0945	GFG	CPP Java	Medium	O(n2)
2	Collecting Coins	BS	Java		O(n)
3	Count Square Submatrices	BS	Java		O(n2)
4	Delete Characters To Equalize Strings	BS	Java		O(n2)
5	Equal Partitions	BS LC	Java		O(n)
6	Largest Sum Of Non Adjacent Numbers	BS	CPP Java		O(1)
7	Longest Bitonic Subsequence	BS	Java		O(n2)
8	Longest Common Substring	BS GFG	CPP Java	Medium	O(1)
9	Longest Increasing Subsequence	BS GFG	Java	Medium	O(n2)
10	Longest Palindromic Substring	BS	CPP		O(1)
11	Longest Sign Alternating Subsequence	BS LC GFG	CPP Java	Medium	O(1)
12	Minimum Dropping Path Sum	BS LC	CPP Java		O(1)
13	Multiset Sum	BS	CPP Java		O(1)
14	Palindrome Splitting	BS LC	CPP Java		O(1)
15	Rod Cutting	BS	Java		O(n)
16	Skip Tasks To Minimize Work	BS	CPP Java		O(1)
17	XOR Range Queries	BS	CPP		O(1)
18	All Possible Full Binary Trees	LC	Java		O(n2)
19	Arithmetic Slices	LC	CPP Java		O(n2)
20	Arithmetic Slices Ii Subsequence	LC	CPP Java		O(n2)
21	Bbt Counter4914	GFG	CPP Java	Easy	O(n)
22	Beautiful Arrangement	LC	Java		O(n)
23	Best Time To Buy And Sell Stock Iv	LC GFG	Java	Hard	O(n2)
24	Best Time To Buy And Sell Stock With Cooldown	LC	Java		O(n)
25	Best Time To Buy And Sell Stock With Transaction Fee	LC	Java		O(n)
26	Binary Trees With Factors	LC	CPP Java		O(n)
27	Box Stacking	GFG	Java	Medium	O(n2)
28	Brackets In Matrix Chain Multiplication1024	GFG	CPP Java	Hard	O(n)
29	Burst Balloons	LC	Java		O(n)
30	Check If There Is A Valid Partition For The Array	LC	CPP Java		O(n)
31	Cherry Pickup Ii	LC	Java		O(n5)
32	Climbing Stairs	LC GFG	Java	Medium	O(n)
33	Coin Change	LC GFG	CPP Java	Medium	O(n2)
34	Coin Change 2	LC	CPP Java		O(n)
35	Count Different Palindromic Subsequences	LC	CPP		O(1)
36	Count Digit Groupings Of A Number1520	GFG	CPP Java	Medium	O(n)
37	Count Number Of Teams	LC	Java		O(n3)
38	Count Number Of Ways To Place Houses	LC	Java		O(n)
39	Count Numbers With Unique Digits	LC	Java		O(n2)
40	Count Of Ap Subsequences0016	GFG	CPP Java	null	O(n2)
41	Count Palindromic Subsequences	GFG	CPP Java	Medium	O(n2)
42	Count Primes	LC	Java		O(n2)
43	Count Sorted Vowel Strings	LC	Java		O(n2)
44	Count Special Integers	LC	Java		O(n)
45	Count Square Submatrices With All Ones	LC	CPP Java		O(n2)
46	Count Unique Characters Of All Substrings Of A Given String	[LC](Ref : https://leetcode.com/problems/count-unique-characters-of-all-substrings-of-a-given-string/discuss/128952/JavaC%2B%2BPython-One-pass-O(N)) LC	CPP		O(1)
47	Count Vowels Permutation	LC	CPP Java		O(n)
48	Counting Bits	LC	CPP Java		O(n2)
49	Cutted Segments1642	GFG	CPP Java	Medium	O(1)
50	Decode Ways	LC	CPP Java		O(n)
51	Decode Ways Ii	LC	CPP Java		O(n)
52	Delete And Earn	LC	Java		O(n)
53	Dice Roll Simulation	LC	Java		O(n)
54	Different Ways To Add Parentheses	LC	Java		O(n3)
55	Distinct Subsequences	LC	CPP Java		O(n)
56	Domino And Tromino Tiling	LC	Java		O(n)
57	Dungeon Game	LC	Java		O(n2)
58	Edit Distance	LC GFG	CPP Java	Medium	O(n2)
59	Egg Drop With 2 Eggs And N Floors	LC	CPP		O(1)
60	Find All Duplicates In An Array	LC	CPP		O(1)
61	Find Two Non Overlapping Sub Arrays Each With Target Sum	LC	Java		O(n2)
62	Freedom Trail	LC	Java		O(n)
63	Friends Pairing Problem5425	GFG	CPP Java	Easy	O(n)
64	Get Maximum In Generated Array	LC	Java		O(n)
65	Get Minimum Squares0538	GFG	CPP Java	Medium	O(1)
66	Gold Mine Problem2608	GFG	CPP Java	Easy	O(1)
67	Greatest Sum Divisible By Three	LC	Java		O(n)
68	House Robber	LC	CPP Java		O(n)
69	House Robber Ii	LC	CPP Java		O(n)
70	House Robber Iii	LC GFG	CPP Java	Medium	O(1)
71	Integer Break	LC	Java		O(n2)
72	Integer Replacement	LC	Java		O(n)
73	Interleaving String	LC	Java		O(n2)
74	Intersecting Intervals	GFG	Java	Hard	O(n)
75	Is Subsequence	LC	Java		O(n)
76	Jump Game Ii	LC	Java		O(n2)
77	Jump Game V	LC	Java		O(n)
78	K Palindrome	GFG	Java	Easy	O(n2)
79	Knapsack With Duplicate Items4201	GFG	CPP Java	Easy	O(1)
80	Knight Dialer	LC	Java		O(n)
81	Knight Probability In Chessboard	LC	Java		O(n)
82	Largest Divisible Subset	LC	CPP Java		O(n2)
83	Largest Sum Of Averages	LC	Java		O(n)
84	Last Stone Weight Ii	LC	Java		O(n)
85	Lcs Of Three Strings0028	GFG	CPP Java	Medium	O(1)
86	Longest Arithmetic Subsequence	LC	Java		O(n2)
87	Longest Arithmetic Subsequence Of Given Difference	LC	Java		O(n)
88	Longest Common Subsequence	LC GFG	CPP Java	Medium	O(n3)
89	Longest Common Subsequence 1587115620	GFG	CPP	Medium	O(1)
90	Longest Continuous Increasing Subsequence	LC	CPP Java		O(1)
91	Longest Ideal Subsequence	LC	CPP Java		O(1)
92	Longest Increasing Path In A Matrix	LC	Java		O(n)
93	Longest Increasing Subsequence	LC	CPP		O(1)
94	Longest Increasing Subsequence 1587115620	GFG	CPP	Medium	O(1)
95	Longest Palindromic Subsequence	LC GFG	CPP Java Python	Medium	O(1)
96	Longest Palindromic Substring	LC	Java		O(n2)
97	Longest Repeating Subsequence2004	GFG	CPP Java	Easy	O(1)
98	Longest String Chain	LC	CPP		O(1)
99	Longest Turbulent Subarray	LC	Java		O(n)
100	Matrix Block Sum	LC	Java		O(n)
101	Matrix Chain Multiplication0303	GFG	CPP Java	Hard	O(1)
102	Max Sum Of Rectangle No Larger Than K	LC	Java		O(n2)
103	Maximal Square	LC GFG	CPP Java	Medium	O(1)
104	Maximum Height By Stacking Cuboids	LC	Java		O(n2)
105	Maximum Length Of Pair Chain	LC	CPP Java		O(1)
106	Maximum Length Of Repeated Subarray	LC	CPP Java		O(1)
107	Maximum Number Of Events That Can Be Attended Ii	LC	Java		O(n)
108	Maximum Profit In Job Scheduling	LC	Java		O(n2)
109	Maximum Score From Performing Multiplication Operations	LC	Java		O(n2)
110	Maximum Score Words Formed By Letters	LC	Java		O(n2)
111	Maximum Sum Increasing Subsequence4749	GFG	Java	Medium	O(n2)
112	Maximum Sum Of Elements Not Part Of Lis	GFG	Java	Medium	O(n)
113	Min Cost Climbing Stairs	LC	CPP Java		O(1)
114	Minimize The Difference Between Target And Chosen Elements	LC	Java		O(n3)
115	Minimum Ascii Delete Sum For Two Strings	LC	Java		O(n2)
116	Minimum Cost For Tickets	LC	CPP Java		O(1)
117	Minimum Cost To Fill Given Weight In A Bag1956	GFG	CPP Java	Medium	O(n2)
118	Minimum Cost Tree From Leaf Values	LC	Java		O(n)
119	Minimum Falling Path Sum	LC	CPP Java		O(1)
120	Minimum Insertion Steps To Make A String Palindrome	LC	Java		O(n2)
121	Minimum Path Cost In A Grid	LC	Java		O(n2)
122	Minimum Path Sum	LC	CPP Java		O(1)
123	Minimum Score Triangulation Of Polygon	LC	Java		O(n2)
124	Minimum Sum Partition3317	GFG	Java	Hard	O(n2)
125	Minimum Swaps To Make Sequences Increasing	LC	Java		O(n)
126	N Queens	LC	CPP		O(1)
127	N Queens Ii	LC	CPP		O(1)
128	N Th Tribonacci Number	LC	Java		O(n)
129	Ncr1019	GFG	CPP Java	Medium	O(n2)
130	Nth Catalan Number0817	GFG	CPP Java	Easy	O(n2)
131	Number Of Coins1824	GFG	Java	Medium	O(n2)
132	Number Of Dice Rolls With Target Sum	LC	Java		O(n2)
133	Number Of Distinct Roll Sequences	LC	CPP Java		O(1)
134	Number Of Longest Increasing Subsequence	LC	CPP Java		O(1)
135	Number Of Paths In A Matrix With K Coins2728	GFG	Java	null	O(1)
136	Number Of People Aware Of A Secret	LC	Java		O(n)
137	Number Of Ways Of Cutting A Pizza	LC	Java		O(n2)
138	Number Of Ways To Form A Target String Given A Dictionary	LC	Java Python		O(n)
139	Number Of Ways To Paint N 3 Grid	LC	Java		O(n3)
140	Number Of Ways To Reach A Position After Exactly K Steps	LC	Java		O(1)
141	Number Of Ways To Stay In The Same Place After Some Steps	LC	Java		O(1)
142	Number Of Ways2552	GFG	Java	Medium	O(n)
143	Numbers At Most N Given Digit Set	LC	Java		O(n)
144	Ones And Zeroes	LC	Java		O(n2)
145	Out Of Boundary Paths	LC	Java		O(n)
146	Paint House Iii	LC	CPP Java		O(1)
147	Painting The Fence3727	GFG	CPP Java	Medium	O(1)
148	Palindrome Partitioning Ii	LC GFG	CPP	null	O(1)
149	Palindrome Partitioning Iv	LC	Java		O(n)
150	Palindromic Substrings	LC	Java		O(n)
151	Partition Array For Maximum Sum	LC	Java		O(n2)
152	Partition To K Equal Sum Subsets	LC	Java		O(n)
153	Path In Matrix3805	GFG	Java	Medium	O(n)
154	Paths In Matrix Whose Sum Is Divisible By K	LC	Java		O(1)
155	Perfect Squares	LC	Java		O(n2)
156	Perfect Sum Problem5633	GFG	Java	Medium	O(1)
157	Poor Pigs	LC	CPP		O(1)
158	Predict The Winner	LC	Java		O(n2)
159	Print All Lcs Sequences3413	GFG	CPP Java	Hard	O(1)
160	Profitable Schemes	LC	Java		O(1)
161	Range Sum Query 2d Immutable	LC	Java		O(n)
162	Reach A Given Score 1587115621	GFG	CPP Java	Easy	O(1)
163	Regular Expression Matching	LC	Java		O(1)
164	Remove Boxes	LC	Java		O(n)
165	Rotate Function	LC	Java		O(n)
166	Russian Doll Envelopes	LC	CPP Java		O(1)
167	Scramble String	LC	Java		O(n)
168	Shortest Common Supersequence	LC	CPP Java		O(1)
169	Sort Integers By The Power Value	LC	Java		O(n)
170	Special Keyboard3018	GFG	Java	Medium	O(n2)
171	Stickler Theif 1587115621	GFG	CPP Java	Easy	O(1)
172	Student Attendance Record Ii	LC	Java		O(n2)
173	Subset Sum Problem 1611555638	GFG	CPP Java	Medium	O(n2)
174	Subset Sum Problem2014	GFG	CPP Java	Medium	O(1)
175	Sum Of Floored Pairs	LC	Java		O(n3)
176	Super Egg Drop	LC GFG	CPP Java	Medium	O(n3)
177	Super Ugly Number	LC	Java		O(n2)
178	Target Sum	LC	CPP Java		O(1)
179	Total Appeal Of A String	LC LC LC	CPP		O(1)
180	Triangle	LC	Java		O(n2)
181	Unique Paths	LC	CPP Java		O(1)
182	Unique Paths Ii	LC	CPP Java		O(1)
183	Wildcard Matching	LC GFG	CPP Java	Medium	O(1)
184	Wildcard String Matching1126	GFG	Java	Hard	O(n2)
185	Word Break	LC GFG	CPP Java	Medium	O(1)
186	Word Wrap1646	GFG	Java	Hard	O(n)

Graph

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	269f61832b146dd5e6d89b4ca18cbd2a2654ebbe	GFG	CPP Java	Medium	O(n2)
2	Number Of Islands	BS GFG	Java	Medium	O(n3)
3	Reverse Graph	BS	Java		O(n3)
4	Unlock Rooms	BS	CPP Java		O(1)
5	Accounts Merge	LC	Java		O(n)
6	All Paths From Source To Target	LC	Java		O(n)
7	Array Nesting	LC	Java		O(n2)
8	Articulation Point 1	GFG	CPP Java	Hard	O(n)
9	Articulation Point2616	GFG	CPP	null	O(1)
10	As Far From Land As Possible	LC	Java		O(n2)
11	Bfs Traversal Of Graph	GFG	CPP Java	Easy	O(n2)
12	Bridge Edge In Graph	GFG	CPP Java	Medium	O(n)
13	Build A Matrix With Conditions	LC	Java		O(n2)
14	Cheapest Flights Within K Stops	LC	CPP Java		O(n3)
15	Circle Of Strings4530	GFG	CPP Java	Medium	O(n)
16	Clone Graph	LC	CPP Java		O(n2)
17	Coloring A Border	LC	Java		O(n)
18	Count Sub Islands	LC	Java		O(n)
19	Count Unreachable Pairs Of Nodes In An Undirected Graph	LC	CPP Java		O(n)
20	Course Schedule	LC	CPP Java		O(n3)
21	Course Schedule Ii	LC	CPP Java		O(n3)
22	Course Schedule Iv	LC	CPP Java		O(n3)
23	Critical Connections In A Network	LC	CPP Java		O(n)
24	Delete And Earn	LC	CPP		O(1)
25	Depth First Traversal For A Graph	GFG	CPP Java	Easy	O(n)
26	Detect Cycle In A Directed Graph	GFG	CPP Java	Medium	O(n)
27	Detect Cycle In An Undirected Graph	GFG	CPP Java	Medium	O(n)
28	Distance From The Source Bellman Ford Algorithm	GFG GFG	CPP Java	Medium	O(n)
29	Employee Importance	LC	CPP Java		O(n2)
30	Euler Circuit And Path	GFG	Java	Medium	O(n2)
31	Euler Circuit In A Directed Graph	GFG	Java	Medium	O(n2)
32	Evaluate Division	LC	Java		O(n)
33	Find Closest Node To Given Two Nodes	LC	CPP Java		O(n3)
34	Find Eventual Safe States	LC	Java		O(n)
35	Find The City With The Smallest Number Of Neighbors At A Threshold Distance	LC	Java		O(n2)
36	Find The Number Of Islands	GFG	CPP	Medium	O(1)
37	Find The Town Judge	LC	CPP Java		O(n2)
38	Geekss Garden	GFG	Java	Easy	O(n4)
39	Implementing Dijkstra Set 1 Adjacency Matrix	GFG	CPP Java	Medium	O(1)
40	Implementing Floyd Warshall2042	GFG	CPP Java	Medium	O(n)
41	Is Graph Bipartite	LC GFG	CPP Java	Medium	O(n3)
42	Journey To The Moon	HR	[CPP](./Graph/HRnk - JourneyToTheMoon.cpp) Java		O(n)
43	Jump Game Iii	LC	Java		O(1)
44	Jump Game Iv	LC	Java		O(n2)
45	Jump Game Vii	LC	Java		O(n)
46	Keys And Rooms	LC	Java		O(n)
47	Largest Color Value In A Directed Graph	LC	Java Python		O(n3)
48	Length Of Largest Region Of 1s 1587115620	GFG	CPP Java	Medium	O(1)
49	Longest Cycle In A Graph	LC	CPP Java		O(1)
50	Maximum Xor After Operations	LC	CPP		O(1)
51	Min Cost To Connect All Points	LC	Java		O(n)
52	Minimize Malware Spread	LC	Java		O(n)
53	Minimize Malware Spread Ii	LC	Java		O(n3)
54	Minimum Cost Path3833	GFG	Java	Hard	O(n2)
55	Minimum Jumps To Reach Home	LC	Java		O(n)
56	Minimum Number Of Days To Disconnect Island	LC	Java		O(n)
57	Minimum Operations To Convert Number	LC	Java		O(n3)
58	Minimum Score Of A Path Between Two Cities	LC	Java		O(n2)
59	Minimum Spanning Tree	GFG	CPP Java	Medium	O(1)
60	Minimum Swaps	GFG	CPP Java	Medium	O(1)
61	Network Delay Time	LC	Java		O(n)
62	Node With Highest Edge Score	LC	CPP Java		O(1)
63	Number Of Closed Islands	LC GFG	Java	Hard	O(n)
64	Number Of Islands	LC	CPP		O(1)
65	Number Of Operations To Make Network Connected	LC	CPP Java		O(n)
66	Number Of Provinces	LC	CPP Java		O(1)
67	Open The Lock	LC	Java		O(n3)
68	Pacific Atlantic Water Flow	LC	Java		O(n)
69	Parallel Courses	LC	CPP		O(1)
70	Parallel Courses Iii	LC	CPP Java		O(1)
71	Possible Bipartition	LC	Java		O(n3)
72	Possible Paths Between 2 Vertices 1587115620	GFG	Java	Medium	O(n2)
73	Prerequisite Tasks	GFG	CPP Java	Medium	O(1)
74	Print Adjacency List 1587115620	GFG	CPP Java	Easy	O(1)
75	Process Restricted Friend Requests	LC	Java		O(n)
76	Reachable Nodes With Restrictions	LC	CPP Java		O(1)
77	Redundant Connection	LC	CPP Java		O(1)
78	Redundant Connection Ii	LC	CPP Java		O(1)
79	Reorder Routes To Make All Paths Lead To The City Zero	LC	Java		O(n2)
80	Rotting Oranges	LC GFG	CPP Java	Medium	O(n)
81	Shortest Bridge	LC	Java		O(n2)
82	Shortest Path In Binary Matrix	LC	Java		O(n)
83	Shortest Path With Alternating Colors	LC	Java		O(n2)
84	Shortest Source To Destination Path3544	GFG	Java	Medium	O(n2)
85	Similar String Groups	LC	Java		O(n2)
86	Smallest Missing Genetic Value In Each Subtree	LC	Java		O(n)
87	Smallest String With Swaps	LC	Java		O(n3)
88	Steps By Knight5927	GFG	CPP Java	Medium	O(1)
89	Strongly Connected Component Tarjanss Algo 1587115621	GFG	CPP Java	Hard	O(1)
90	Strongly Connected Components Kosarajus Algo	GFG	CPP Java	Medium	O(1)
91	Surrounded Regions	LC	Java		O(n)
92	The Time When The Network Becomes Idle	LC	Java		O(n3)
93	Time Needed To Inform All Employees	LC	Java		O(n2)
94	Topological Sort	GFG	CPP Java	Medium	O(1)
95	Water And Jug Problem	LC	Java		O(n3)
96	Where Will The Ball Fall	LC	Java		O(n2)
97	Word Boggle4143	GFG	Java	Medium	O(n4)
98	Word Ladder	LC GFG	CPP Java	null	O(1)
99	X Total Shapes3617	GFG	Java	Medium	O(n3)

Greedy

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	919	LC2	Java		O(n2)
2	Fractional Knapsack	BS GFG	CPP	Medium	O(1)
3	Append K Integers With Minimal Sum	LC	Java		O(n)
4	Chocolate Distribution Problem3825	GFG	CPP Java	Easy	O(n)
5	Cinema Seat Allocation	LC	Java		O(n)
6	Coin Piles5152	GFG	CPP Java	Medium	O(n2)
7	Construct Smallest Number From Di String	LC	Java		O(n)
8	Course Schedule Iii	LC	CPP		O(1)
9	Design An Atm Machine	LC	Java		O(n)
10	Divide Intervals Into Minimum Number Of Groups	LC	Java		O(n)
11	Element Appearing More Than 25 In Sorted Array	LC	Java		O(n)
12	Find The Minimum Number Of Fibonacci Numbers Whose Sum Is K	LC	Java		O(n)
13	Fractional Knapsack 1587115620	GFG	Java	Medium	O(n)
14	Gas Station	LC	Java		O(n)
15	Hand Of Straights	LC	Java		O(n)
16	Huffman Encoding3345	GFG	CPP Java	Medium	O(1)
17	Ipo	LC	Java		O(n2)
18	Job Sequencing Problem 1587115620	GFG	CPP Java	Medium	O(1)
19	Largest Number With Given Sum 1587115620	GFG	Java	Easy	O(n)
20	Largest Palindromic Number	LC	Java		O(n)
21	Largest Values From Labels	LC	Java		O(n)
22	Least Number Of Unique Integers After K Removals	LC	Java		O(n)
23	Length Of The Longest Alphabetical Continuous Substring	LC	Java		O(n)
24	Longer Contiguous Segments Of Ones Than Zeros	LC	Java		O(n)
25	Longest Binary Subsequence Less Than Or Equal To K	LC	CPP		O(1)
26	Longest Subarray With Maximum Bitwise And	LC	Java		O(n)
27	Longest Subsequence With Limited Sum	LC	Java		O(n)
28	Make Array Zero By Subtracting Equal Amounts	LC	Java		O(n)
29	Max Length Chain	GFG	CPP Java	Medium	O(1)
30	Maximize Sum After K Negations1149	GFG	CPP Java	Easy	O(1)
31	Maximize Toys0331	GFG	CPP Java	Easy	O(1)
32	Maximum Area Of A Piece Of Cake After Horizontal And Vertical Cuts	LC	Java		O(n)
33	Maximum Number Of Consecutive Values You Can Make	LC	Java		O(n)
34	Maximum Number Of Groups Entering A Competition	LC	CPP Java		O(1)
35	Maximum Points You Can Obtain From Cards	LC	Java		O(n)
36	Merge Intervals	LC	CPP		O(1)
37	Minimum Cost Of Buying Candies With Discount	LC	Java		O(n)
38	Minimum Cost Of Ropes 1587115620	GFG	Java	Easy	O(n)
39	Minimum Deletions To Make Array Divisible	LC	Java		O(n2)
40	Minimum Money Required Before Transactions	LC	Java		O(n)
41	Minimum Number Of Refueling Stops	LC	Java		O(n2)
42	Minimum Replacements To Sort The Array	LC	Java		O(n)
43	Minimum Swaps To Make Strings Equal	LC	Java		O(n)
44	Minimum Time To Make Rope Colorful	LC	Java		O(n2)
45	Minimum Time To Type Word Using Special Typewriter	LC	Java		O(n)
46	Most Profit Assigning Work	LC	Java		O(n2)
47	N Meetings In One Room 1587115620	GFG	CPP Java	Easy	O(n)
48	Optimal Partition Of String	LC	Java		O(n)
49	Pairs With Specific Difference1533	GFG	CPP Java	Easy	O(1)
50	Patching Array	LC	Java		O(n2)
51	Queue Reconstruction By Height	LC	Java		O(n2)
52	Rabbits In Forest	LC	Java		O(n)
53	Reducing Dishes	LC	Java		O(n)
54	Remove Colored Pieces If Both Neighbors Are The Same Color	LC	Java		O(n)
55	Remove Digit From Number To Maximize Result	LC	Java		O(n)
56	Removing Minimum And Maximum From Array	LC	Java		O(n)
57	Shop In Candy Store1145	GFG	CPP Java	Easy	O(n)
58	Shortest Distance To A Character	LC	Java		O(n)
59	Shortest Impossible Sequence Of Rolls	LC	CPP Java		O(1)
60	Smallest Number5829	GFG	CPP	null	O(1)
61	Split The Binary String Into Substrings With Equal Number Of 0s And 1s	GFG	Java	Medium	O(n)
62	Task Scheduler	LC	CPP Java		O(1)
63	Task Scheduler Ii	LC	Java		O(n)
64	The Number Of Weak Characters In The Game	LC	Java		O(n)
65	Water Connection Problem5822	GFG	CPP Java	Medium	O(1)

Hashing

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	4sum Ii	LC	Java		O(n2)
2	Condo Developers	BS	CPP		O(1)
3	Palindromic Anagram	BS	Java		O(n)
4	Smallest Intersecting Element	BS	Java		O(n2)
5	Underground Tunnel	BS	CPP		O(1)
6	All Oone Data Structure	LC	Java		O(1)
7	Array Pair Sum Divisibility Problem3257	GFG	Java	Easy	O(n)
8	Array Subset Of Another Array2317	GFG	Java	Easy	O(n)
9	Bulls And Cows	LC	Java		O(n)
10	Check Array Formation Through Concatenation	LC	Java		O(n)
11	Check Distances Between Same Letters	LC	Java		O(n)
12	Check If A String Contains All Binary Codes Of Size K	LC	CPP Java		O(n)
13	Check If The Sentence Is Pangram	LC	Java		O(n)
14	Continuous Subarray Sum	LC	Java		O(n2)
15	Count Element Occurences	GFG	Java	Medium	O(n)
16	Count Good Meals	LC	CPP Java		O(n2)
17	Count Number Of Bad Pairs	LC	Java		O(n)
18	Count Number Of Distinct Integers After Reverse Operations	LC	Java		O(n2)
19	Count Pairs In Array Divisible By K	GFG	Java	Medium	O(n)
20	Count Triplets 1	HR	Java		O(n)
21	Ctci Ransom Note	HR	Java		O(n)
22	Degree Of An Array	LC	Java		O(n)
23	Design A Number Container System	LC	CPP		O(1)
24	Design Hashmap	LC	CPP Java		O(n)
25	Design Hashset	LC	CPP Java		O(n)
26	Determine If String Halves Are Alike	LC	Java		O(n)
27	Evaluate The Bracket Pairs Of A String	LC	Java		O(n2)
28	Find All Duplicates In An Array	LC	Java		O(n)
29	Find All Lonely Numbers In The Array	LC	Java		O(n)
30	Find All Numbers Disappeared In An Array	LC	CPP Java		O(n)
31	Find Common Characters	LC	CPP Java		O(n2)
32	Find Original Array From Doubled Array	LC	Java		O(n)
33	Find Subarrays With Equal Sum	LC	Java		O(n)
34	Find The Difference Of Two Arrays	LC	Java		O(n)
35	Find Unique Binary String	LC	CPP Java		O(n2)
36	First Missing Positive	LC	CPP Java		O(n)
37	First Non Repeating Character In A Stream1216	GFG	Java	Medium	O(n2)
38	First Repeating Element4018	GFG	Java	null	O(n)
39	Group Anagrams	LC	Java		O(n3)
40	In First But Second5423	GFG	CPP Java	Medium	O(n)
41	Intersection Of Multiple Arrays	LC	Java		O(n)
42	Largest Positive Integer That Exists With Its Negative	LC	Java		O(n)
43	Longest K Unique Characters Substring0853	GFG	CPP	Easy	O(1)
44	Longest Palindrome By Concatenating Two Letter Words	LC	Java		O(n)
45	Longest Subarray With Sum Divisible By K1259	GFG	Java	Medium	O(n2)
46	Longest Substring Without Repeating Characters	LC	CPP Java		O(1)
47	Max Distance Between Same Elements	GFG	CPP	Easy	O(1)
48	Max Number Of K Sum Pairs	LC	Java		O(n)
49	Max Sum Of A Pair With Equal Sum Of Digits	LC	Java		O(n2)
50	Maximum Number Of Pairs In Array	LC	Java		O(n)
51	Maximum Repeating Number4858	GFG	CPP	Basic	O(1)
52	Merge Similar Items	LC	Java		O(n)
53	Minimum Consecutive Cards To Pick Up	LC	Java		O(n)
54	Minimum Index Sum Of Two Lists	LC	Java		O(n)
55	Minimum Replacements To Sort The Array	LC	CPP		O(1)
56	Most Common Word	LC	Java		O(n)
57	Most Frequent Word In An Array Of Strings3528	GFG	CPP Java	Medium	O(1)
58	Naming A Company	LC	Java		O(n3)
59	Number Of Arithmetic Triplets	LC	Java		O(n)
60	Number Of Ways Where Square Of Number Is Equal To Product Of Two Numbers	LC	Java		O(n)
61	Pairs Of Songs With Total Durations Divisible By 60	LC	CPP		O(1)
62	Partition Labels	LC	Java		O(n)
63	Points In Straight Line	GFG	Java	Hard	O(n2)
64	Rank Transform Of An Array	LC	Java		O(n2)
65	Rearrange Characters To Make Target String	LC	Java		O(n)
66	Recover The Original Array	LC	Java		O(n2)
67	Relative Sorting4323	GFG	Java	Medium	O(n2)
68	Remove Letter To Equalize Frequency	LC	Java		O(n)
69	Reordered Power Of 2	LC	Java		O(n2)
70	Repeated Dna Sequences	LC	Java		O(n)
71	Replace Elements In An Array	LC	Java		O(n)
72	Rings And Rods	LC	Java		O(n)
73	Sender With Largest Word Count	LC	Java		O(n)
74	Sort Array By Increasing Frequency	LC	Java		O(n2)
75	Sort The Jumbled Numbers	LC	Java		O(n2)
76	Split Array Into Consecutive Subsequences	LC	Java		O(n)
77	Stock Price Fluctuation	LC	Java		O(n)
78	Subdomain Visit Count	LC	Java		O(n2)
79	Swapping Pairs Make Sum Equal4142	GFG	Java	Easy	O(n)
80	Task Scheduler Ii	LC	CPP		O(1)
81	Top K Frequent Elements In Array	GFG	Java	Easy	O(n)
82	Top K Frequent Words	LC	Java		O(n2)
83	Uncommon Words From Two Sentences	LC	CPP Java		O(1)
84	Unique Email Addresses	LC	CPP Java		O(1)
85	Unique Number Of Occurrences	LC	CPP		O(1)

Heap

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	K Unique String	BS	Java		O(n)
2	Optimal Decrement	BS	Java		O(n)
3	Chinky And Diamonds3340	GFG	Java	Easy	O(n)
4	Course Schedule Iii	LC	Java		O(n)
5	Find K Pairs With Smallest Sums	LC	Java		O(n)
6	Find K Th Smallest Element In Given N Ranges	GFG	Java	Medium	O(n2)
7	Find Median From Data Stream	LC GFG	CPP Java	Hard	O(1)
8	Find Nearest Point That Has The Same X Or Y Coordinate	LC	CPP Java		O(1)
9	Find Subsequence Of Length K With The Largest Sum	LC	Java		O(n)
10	Find The Kth Largest Integer In The Array	LC	Java		O(n)
11	Find The Kth Smallest Sum Of A Matrix With Sorted Rows	LC	Java		O(n2)
12	Furthest Building You Can Reach	LC	Java		O(n)
13	Is Binary Tree Heap	GFG	CPP Java	Easy	O(1)
14	Jump Game Vi	LC	Java		O(n2)
15	K Closest Points To Origin	LC	CPP Java		O(n)
16	K Largest Elements4206	GFG	Java	Medium	O(n)
17	K Th Largest Sum Contiguous Subarray	GFG	Java	Medium	O(n2)
18	Kth Largest Element In A Stream	LC	Java		O(n)
19	Kth Largest Element In A Stream703.	LC	CPP		O(1)
20	Kth Largest Element In An Array	LC	CPP Java		O(n)
21	Kth Smallest Element5635	GFG	CPP	Medium	O(1)
22	Maximum Number Of Events That Can Be Attended	LC	Java		O(n2)
23	Maximum Performance Of A Team	LC	Java		O(1)
24	Meeting Rooms Iii	LC	Java		O(n)
25	Merge K Sorted Arrays	GFG	CPP Java	Medium	O(1)
26	Merge K Sorted Lists	LC	CPP Java		O(1)
27	Merge Two Binary Max Heap0144	GFG	Java	Easy	O(n)
28	Minimum Cost Of Ropes 1587115620	GFG	CPP Java	Easy	O(1)
29	Minimum Cost To Hire K Workers	LC	Java		O(n)
30	Minimum Obstacle Removal To Reach Corner	LC	Java		O(n)
31	Minimum Sum4058	GFG	CPP Java	Medium	O(1)
32	Process Tasks Using Servers	LC	Java		O(n2)
33	Single Threaded Cpu	LC	Java		O(n)
34	Sliding Window Median	LC	Java		O(n)
35	Smallest Range Covering Elements From K Lists	LC GFG	CPP Java	Hard	O(1)
36	The K Weakest Rows In A Matrix	LC	Java		O(n)
37	Top K Frequent Words	LC	CPP		O(1)
38	Trapping Rain Water Ii	LC	Java		O(n2)

Linked-List

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	87f12e5c728d69a5322634776b54c75897d14daa	GFG	Java	Medium	O(n2)
2	Central Linked List	BS LC GFG	CPP	Easy	O(n2)
3	Interleaved Linked List	BS	Java		O(n)
4	Linked List Union	BS	Java		O(n)
5	Pairwise Linked List Swap	BS LC	Java		O(n)
6	Reverse A Linked List	BS LC	CPP Java		O(1)
7	Swap Kth Node Values	BS	Java		O(n)
8	Add 1 To A Number Represented As Linked List	GFG	CPP Java	Easy	O(1)
9	Add Two Numbers	LC	CPP Java		O(n)
10	Add Two Numbers Ii	LC GFG	CPP Java	Easy	O(n)
11	Check If Linked List Is Pallindrome	GFG	CPP Java	Easy	O(n)
12	Circular Linked List	GFG	CPP Java	Basic	O(n)
13	Convert Binary Number In A Linked List To Integer	LC	CPP Java		O(1)
14	Copy List With Random Pointer	LC GFG	CPP Java	Hard	O(n)
15	Decimal Equivalent Of Binary Linked List	GFG	CPP Java	Easy	O(n)
16	Delete Middle Of Linked List	GFG	CPP Java	Easy	O(n)
17	Delete N Nodes After M Nodes Of A Linked List	GFG	CPP Java	Easy	O(1)
18	Delete Nodes Having Greater Value On Right	GFG	CPP Java	Medium	O(1)
19	Delete The Middle Node Of A Linked List	LC	Java		O(n)
20	Deletion And Reverse In Linked List	GFG	CPP Java	Easy	O(n)
21	Design Browser History	LC	Java		O(n)
22	Find The Minimum And Maximum Number Of Nodes Between Critical Points	LC	Java		O(n)
23	Flatten A Multilevel Doubly Linked List	LC GFG	CPP Java	Medium	O(n)
24	Given A Linked List Of 0s 1s And 2s Sort It	GFG	CPP Java	Easy	O(1)
25	Given A Linked List Reverse Alternate Nodes And Append At The End	GFG	CPP Java	null	O(1)
26	Implement Stack Using Queues	LC	CPP		O(1)
27	Insertion Sort List	LC	Java		O(n2)
28	Intersection Of Two Linked List	GFG	Java	Easy	O(n)
29	Intersection Of Two Sorted Linked Lists	GFG	Java	Easy	O(n)
30	Length Of Longest Palindrome In Linked List	GFG	Java	Medium	O(n)
31	Linked List Cycle	LC	CPP Java		O(n)
32	Linked List Cycle Ii	LC	CPP Java		O(1)
33	Linked List Of Strings Forms A Palindrome	GFG	Java	Easy	O(n)
34	Linked List That Is Sorted Alternatingly	GFG	Java	Easy	O(n)
35	Maximum Twin Sum Of A Linked List	LC	Java		O(n)
36	Merge 2 Sorted Linked List In Reverse Order	GFG	Java	Easy	O(n)
37	Merge In Between Linked Lists	LC	Java		O(n)
38	Merge Nodes In Between Zeros	LC	Java		O(n)
39	Merge Sort On Doubly Linked List	GFG	Java	Medium	O(n)
40	Merge Two Sorted Lists	LC	CPP Java		O(1)
41	Middle Of The Linked List	LC	Java		O(n)
42	Modify Linked List 1	GFG	Java	Easy	O(n)
43	Multiply Two Linked Lists	GFG	CPP Java	Easy	O(1)
44	Next Greater Node In Linked List	LC	Java		O(n)
45	Odd Even Linked List	LC	CPP Java		O(1)
46	Partition A Linked List Around A Given Value	GFG	CPP Java	Medium	O(1)
47	Partition List	LC	CPP Java		O(1)
48	Polynomial Addition	GFG	Java	Medium	O(n)
49	Quick Sort On Linked List	GFG	CPP Java	Medium	O(1)
50	Remove All Occurences Of Duplicates In A Linked List	GFG	Java	Medium	O(n)
51	Remove Duplicates From Sorted List	LC	CPP Java		O(1)
52	Remove Duplicates From Sorted List Ii	LC	CPP Java		O(1)
53	Remove Every Kth Node	GFG	Java	Easy	O(n)
54	Remove Linked List Elements	LC	CPP Java		O(1)
55	Remove Loop In Linked List	GFG	CPP Java	Medium	O(1)
56	Remove Nth Node From End Of List	LC GFG	CPP Java	Easy	O(1)
57	Remove Zero Sum Consecutive Nodes From Linked List	LC	Java		O(n)
58	Reorder List	LC	Java		O(n)
59	Reverse A Doubly Linked List	GFG	CPP Java	Easy	O(1)
60	Reverse A Linked List In Groups Of Given Size	GFG	CPP	Medium	O(1)
61	Reverse Linked List Ii	LC	CPP Java		O(1)
62	Reverse Nodes In Even Length Groups	LC	Java		O(n)
63	Reverse Nodes In K Group	LC	CPP Java		O(1)
64	Rotate A Linked List	GFG	CPP Java	Medium	O(1)
65	Rotate List	LC	CPP		O(1)
66	Segregate Even And Odd Nodes In A Linked List5035	GFG	CPP Java	Easy	O(1)
67	Sort A Linked List	GFG	CPP Java	Medium	O(1)
68	Sort List	LC	CPP		O(1)
69	Sorted Insert For Circular Linked List	GFG	Java	Easy	O(n)
70	Split A Circular Linked List Into Two Halves	GFG	CPP Java	Easy	O(n)
71	Split Linked List In Parts	LC	Java		O(n2)
72	Swap Nodes In Pairs	LC	CPP		O(1)

Matrix

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Bomber Man	BS	CPP Java		O(n2)
2	Condo Developers	BS	Java		O(n2)
3	Conway's Game Of Life	BS	CPP Java		O(n2)
4	Enclosed Islands	BS LC	Java		O(n2)
5	Matrix Search	BS LC GFG	CPP Java	Medium	O(1)
6	N Lexicographic Integers	BS	CPP		O(1)
7	Spiral Matrix	BS LC GFG	Java	Medium	O(n)
8	Zero Matrix	BS	Java		O(n2)
9	Adventure In A Maze2051	GFG	Java	null	O(n)
10	Battleships In A Board	LC	Java		O(n2)
11	Boolean Matrix Problem 1587115620	GFG	CPP Java	Medium	O(n2)
12	Boundary Elements Of Matrix1102	GFG	CPP Java	Easy	O(n)
13	Bricks Falling When Hit	LC	Java		O(n)
14	Check If Matrix Is X Matrix	LC	Java		O(n)
15	Check If There Is A Valid Parentheses String Path	LC	Java		O(1)
16	Count Occurences Of A Given Word In A 2 D Array	GFG	Java	null	O(n)
17	Count Servers That Communicate	LC	CPP Java		O(n2)
18	Design A Food Rating System	LC	CPP		O(1)
19	Equal Row And Column Pairs	LC	CPP Java		O(n2)
20	Find All Groups Of Farmland	LC	Java		O(n3)
21	Find Nth Element Of Spiral Matrix	GFG	CPP Java	Medium	O(1)
22	Find The String In Grid0111	GFG	Java	Medium	O(n2)
23	Flipping An Image	LC	Java		O(n)
24	Flood Fill	LC	CPP		O(1)
25	Game Of Life	LC	Java		O(n2)
26	Island Perimeter	LC	Java		O(n2)
27	Largest Local Values In A Matrix	LC	CPP Java		O(n4)
28	Largest Rectangular Sub Matrix Whose Sum Is 0	GFG	Java	null	O(n3)
29	Largest Zigzag Sequence5416	GFG	Java	Easy	O(n3)
30	Magic Squares In Grid	LC	Java		O(n)
31	Max Area Of Island	LC	CPP		O(1)
32	Max Rectangle	GFG	Java	Medium	O(n2)
33	Maximum Area Of Triangle	IB	Java		O(n2)
34	Maximum Difference Between Pair In A Matrix	GFG	Java	Hard	O(n2)
35	Maximum Rows Covered By Columns	LC	Java		O(n2)
36	Maximum Sum Of An Hourglass	LC	Java		O(n2)
37	Maximum Sum Rectangle2948	GFG	Java	null	O(n)
38	Minesweeper	LC	Java		O(n2)
39	Number Of Excellent Pairs	LC	CPP		O(1)
40	Number Of Palindromic Paths In A Matrix0819	GFG	Java	Medium	O(n2)
41	Prettyprint	IB	CPP Java		O(1)
42	Print Diagonally1623	GFG	Java	Medium	O(n2)
43	Print Matrix In Diagonal Pattern	GFG	Java	Easy	O(n2)
44	Queens That Can Attack The King	LC	Java		O(n)
45	Rank Of Matrix	GFG	Java	Medium	O(n3)
46	Reverse Spiral Form Of Matrix4033	GFG	Java	Medium	O(n2)
47	Rotate Image	LC	CPP Java		O(1)
48	Rotate Matrix Elements Clockwise2336	GFG	Java	Easy	O(n2)
49	Row With Max 1s0023	GFG	CPP Java	Medium	O(1)
50	Row With Minimum Number Of 1s5430	GFG	Java	Easy	O(n)
51	Search A 2d Matrix	LC	CPP Java		O(1)
52	Search A 2d Matrix Ii	LC GFG	CPP Java	Medium	O(1)
53	Set Matrix Zeroes	LC	CPP Java		O(n2)
54	Snakes And Ladders	LC	Java		O(n2)
55	Sort The Matrix Diagonally	LC GFG	CPP Java	Medium	O(1)
56	Spiral Matrix	LC	CPP		O(1)
57	Spiral Matrix Ii	LC	CPP Java		O(1)
58	Spiral Matrix Iii	LC	Java		O(n2)
59	Spiral Matrix Iv	LC	CPP Java		O(1)
60	Transpose Matrix	LC	CPP Java		O(1)
61	Valid Sudoku	LC	CPP Java		O(n3)

Miscellaneous

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	132 Pattern	LC	Java		O(n2)
2	Compressed Vector Product	BS	Java		O(n)
3	Contiguous Intervals	BS	Java		O(n)
4	Contiguously Increasing Numbers	BS	CPP Java		O(1)
5	Dropped Sensor Metric	BS	Java		O(n)
6	Quadratic Application	BS	Java		O(n)
7	Roman Numeral To Integer	BS	Java		O(n)
8	The Auditor	BS LC	Java		O(n)
9	Underground Tunnel	BS	Java		O(n)
10	Virtually Cloneable Stacks	BS	CPP Java		O(1)
11	Zipped Iterator	BS	CPP Java		O(1)
12	Array Of Doubled Pairs	LC	Java		O(n)
13	Assign Cookies	LC	Java		O(n2)
14	Basic Calculator	LC	Java		O(n2)
15	Basic Calculator Ii	LC	Java		O(n2)
16	Best Poker Hand	LC	CPP Java		O(n)
17	Best Time To Buy And Sell Stock	LC	Java		O(n)
18	Best Time To Buy And Sell Stock Iii	LC GFG	Java	Medium	O(n)
19	Binary Search	GFG	Java	Basic	O(n)
20	Binary Searchable Elements	GFG	Java	Medium	O(n)
21	Check If Number Has Equal Digit Count And Digit Value	LC	Java		O(n)
22	Circular Array Loop	LC	Java		O(n)
23	Compare Version Numbers	LC	Java		O(n)
24	Concatenation Of Consecutive Binary Numbers	LC	Java		O(n2)
25	Contains Duplicate Iii	LC	Java		O(n)
26	Convert 1d Array Into 2d Array	LC	Java		O(n)
27	Convert A Sentence Into Its Equivalent Mobile Numeric Keypad Sequence0547	GFG	Java	Easy	O(n2)
28	Cosmic Number	GFG	Java	Easy	O(n2)
29	Count Asterisks	LC	Java		O(n)
30	Count Days Spent Together	LC	Java		O(n)
31	Count Items Matching A Rule	LC	Java		O(n)
32	Data Stream As Disjoint Intervals	LC	Java		O(n)
33	Decode The Slanted Ciphertext	LC	Java		O(n)
34	Delete Characters To Make Fancy String	LC	Java		O(n)
35	Delete Columns To Make Sorted	LC	Java		O(n2)
36	Design A Food Rating System	LC	Java		O(n)
37	Design A Number Container System	LC	Java		O(1)
38	Design Bitset	LC	Java		O(n)
39	Design Movie Rental System	LC	Java		O(n3)
40	Design Underground System	LC	Java		O(n)
41	Distribute Candies	LC	Java		O(n)
42	Elimination Game	LC	Java		O(n2)
43	Excel Sheet Column Title	LC	Java		O(n)
44	Find Duplicate File In System	LC	Java		O(n2)
45	Find Kth Bit In Nth Binary String	LC	Java		O(n)
46	Finding Mk Average	LC	Java		O(n)
47	Fizz Buzz	LC	Java		O(n)
48	Flatten Nested List Iterator	LC	Java		O(n)
49	Geek And Bridges	GFG	Java	Easy	O(n3)
50	Geek Onacci Number	GFG	Java	Easy	O(n2)
51	Get Watched Videos By Your Friends	LC	Java		O(n3)
52	Happy Number	LC	Java		O(n2)
53	Heaters	LC	Java		O(n)
54	How Many Numbers Are Smaller Than The Current Number	LC	Java		O(n)
55	Increasing Triplet Subsequence	LC	Java		O(n)
56	Insert Delete Getrandom O1	LC	Java		O(n)
57	Integer To English Words	LC	Java		O(n)
58	Invalid Transactions	LC	Java		O(n2)
59	K Subarray Sum	GFG	Java	Easy	O(n2)
60	Keep Multiplying Found Values By Two	LC	Java		O(n)
61	Keyboard Row	LC	Java		O(n2)
62	Largest Number At Least Twice Of Others	LC	Java		O(n)
63	Largest Perimeter Triangle	LC	Java		O(n)
64	Latest Time By Replacing Hidden Digits	LC	Java		O(1)
65	Letter Combinations Of A Phone Number	LC	Java		O(n)
66	Longest Binary Subsequence Less Than Or Equal To K	LC	Java		O(n)
67	Longest Harmonious Subsequence	LC	Java		O(n)
68	Longest Increasing Subsequence Ii	LC	Java		O(n2)
69	Longest Subarray With Atmost K Even Elements	GFG	Java	Easy	O(n2)
70	Longest Uploaded Prefix	LC	Java		O(n)
71	Maximize The Confusion Of An Exam	LC	Java		O(n2)
72	Maximum Consecutive Floors Without Special Floors	LC	Java		O(n)
73	Maximum Difference Between Increasing Elements	LC	Java		O(n)
74	Maximum Frequency Stack	LC	Java		O(1)
75	Min Number Of Flips3210	GFG	Java	Easy	O(n)
76	Mini Parser	LC	Java		O(n2)
77	Minimum Amount Of Time To Collect Garbage	LC	Java		O(n)
78	Minimum Amount Of Time To Fill Cups	LC	CPP Java		O(1)
79	Minimum Deletions To Make Array Divisible	LC	CPP		O(1)
80	Minimum Depth Of Binary Tree	LC	Java		O(1)
81	Minimum Hours Of Training To Win A Competition	LC	Java		O(n)
82	Minimum Number Of Increments On Subarrays To Form A Target Array	LC	Java		O(n)
83	Minimum Number Of Moves To Seat Everyone	LC	Java		O(n)
84	Minimum Number Of Operations To Convert Time	LC	Java		O(1)
85	Minimum Operations To Reduce X To Zero	LC	Java		O(n2)
86	Most Frequent Even Element	LC	Java		O(n)
87	My Calendar I	LC	Java		O(n)
88	My Calendar Ii	LC	Java		O(n)
89	My Calendar Iii	LC	Java		O(n)
90	New Year Chaos	HR	Java		O(n)
91	Next Greater Element Iii	LC	CPP		O(1)
92	Number Of Common Factors	LC	Java		O(n)
93	Palindrome Number	LC	CPP		O(1)
94	Peeking Iterator	LC	Java		O(1)
95	Plates Between Candles	LC	Java		O(n)
96	Power Of Four	LC	Java		O(n)
97	Power Of Three	LC	Java		O(n)
98	Previous Permutation With One Swap	LC	Java		O(n)
99	Print Pattern3549	GFG	Java	Easy	O(1)
100	Queries On Number Of Points Inside A Circle	LC	Java		O(n2)
101	Query Kth Smallest Trimmed Number	LC	Java		O(n2)
102	Rank Teams By Votes	LC	Java		O(n)
103	Reach A Number	LC	Java		O(n)
104	Reach The Target	GFG	Java	Easy	O(n)
105	Rearrange Array Elements By Sign	LC	Java		O(n)
106	Remove Comments	LC	Java		O(n2)
107	Replace By X	GFG	Java	Easy	O(n)
108	Replace Every Element With The Least Greater Element On Its Right	GFG	Java	Hard	O(n)
109	Robot Bounded In Circle	LC	Java		O(n)
110	Shortest Subarray To Be Removed To Make Array Sorted	LC	Java		O(n)
111	Simple Bank System	LC	Java		O(1)
112	Slowest Key	LC	Java		O(n)
113	Smallest Even Multiple	LC	Java		O(n)
114	Smallest Factorial Number5929	GFG	CPP Java	Easy	O(1)
115	Smallest Number In Infinite Set	LC	CPP Java		O(1)
116	Smallest Value Of The Rearranged Number	LC	Java		O(n)
117	Sort Even And Odd Indices Independently	LC	Java		O(n)
118	Sorting Elements Of An Array By Frequency 1587115621	GFG	Java	Medium	O(n2)
119	Stamping The Sequence	LC	Java		O(n2)
120	Strictly Palindromic Number	LC	Java		O(1)
121	Substring With Concatenation Of All Words	LC	Java		O(n2)
122	Sum Of Number And Its Reverse	LC	Java		O(n)
123	Sum Of Numbers With Units Digit K	LC	CPP Java		O(1)
124	Sum Of Square Numbers	LC	Java		O(n2)
125	Sum Of Two Numbers Without Using Arithmetic Operators	GFG	CPP	Easy	O(1)
126	The Employee That Worked On The Longest Task	LC	Java		O(n)
127	The Latest Time To Catch A Bus	LC	Java		O(n2)
128	The Skyline Problem	LC	Java		O(n)
129	Third Maximum Number	LC	Java		O(n)
130	Three Consecutive Odds	LC	Java		O(n)
131	Time Needed To Rearrange A Binary String	LC	Java		O(n2)
132	Two Furthest Houses With Different Colors	LC	Java		O(n2)
133	Ugly Number Iii	LC	Java		O(n)
134	Unique Morse Code Words	LC	Java		O(n2)
135	Utf 8 Validation	LC	Java		O(n)
136	Valid Mountain Array	LC	Java		O(n)
137	Walking Robot Simulation	LC	Java		O(n)
138	You And Your Books	GFG	Java	Easy	O(n)
139	Zigzag Conversion	LC	Java		O(1)

Queue

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Circular Tour 1587115620	GFG	CPP Java	Medium	O(n)
2	Design Circular Deque	LC	Java		O(1)
3	Design Circular Queue	LC	Java		O(1)
4	Design Front Middle Back Queue	LC	Java		O(n)
5	First Negative Integer In Every Window Of Size K3345	GFG	Java	Easy	O(n)
6	Implement Queue Using Array	GFG	CPP	null	O(1)
7	Implement Queue Using Stacks	LC	CPP Java		O(1)
8	Lru Cache	LC GFG	CPP Java	null	O(1)
9	Maximum Sum Circular Subarray	LC	Java		O(n2)
10	Number Of Recent Calls	LC	Java		O(n)
11	Page Faults In Lru5603	GFG	CPP	Medium	O(1)
12	Reveal Cards In Increasing Order	LC	Java		O(n2)
13	Sliding Window Maximum	LC GFG GFG	CPP Java	null	O(n2)

Recursion

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Count Nodes In Complete Binary Tree	BS LC	CPP		O(1)
2	N Lexicographic Integers	BS LC	CPP		O(1)
3	Combinations	LC	CPP Java		O(n)
4	Construct Quad Tree	LC	Java		O(n2)
5	Flood Fill	LC	CPP		O(1)
6	Flood Fill Algorithm1856	GFG	Java	Medium	O(1)
7	Gray Code	LC GFG	CPP Java	Easy	O(n)
8	Josephus Problem	GFG	CPP Java	Easy	O(1)
9	Letter Case Permutation	LC	CPP Java		O(1)
10	Number Of Paths0926	GFG	Java	Easy	O(n)
11	Palindrome String0817	GFG	CPP Java	Easy	O(1)
12	Pascals Triangle	LC	CPP Java		O(1)
13	Pascals Triangle Ii	LC	CPP Java		O(1)
14	Permutations Of A Given String2041	GFG	CPP	Medium	O(1)
15	Power Set4302	GFG	Java	Easy	O(1)
16	Restore Ip Addresses	LC GFG	Java	Medium	O(1)
17	Subsets	LC	CPP Java		O(1)
18	Tower Of Hanoi 1587115621	GFG	CPP Java	Medium	O(1)

Searching

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	3d27d4683c121c1f152ee8f41279255dc4430cf6	GFG	CPP Java	Medium	O(1)
2	3sum	LC	CPP Java		O(n3)
3	3sum Closest	LC	CPP Java		O(1)
4	4sum	LC	CPP Java		O(n4)
5	4sum Ii	LC	CPP		O(1)
6	Insertion Index In Sorted List	BS GFG	Java	Easy	O(n)
7	Lowest Sum Of Pair Larger Than Target	BS	CPP Java		O(1)
8	Allocate Minimum Number Of Pages0937	GFG	Java	Hard	O(n)
9	Arithmetic Number2815	GFG	CPP Java	Easy	O(1)
10	Arithmetic Subarrays	LC	CPP		O(1)
11	Binary Search	GFG	CPP	Basic	O(1)
12	Capacity To Ship Packages Within D Days	LC GFG	Java	Medium	O(n)
13	Convert Sorted Array To Binary Search Tree	LC	Java		O(n)
14	Convert Sorted List To Binary Search Tree	LC	Java		O(n)
15	Count Of Smaller Numbers After Self	LC	Java		O(n)
16	Count Pairs With Given Sum5022	GFG	CPP	Easy	O(1)
17	Count Possible Triangles 1587115620	GFG	CPP Java	Medium	O(n3)
18	Count Special Quadruplets	LC	CPP		O(1)
19	Count The Zeros2550	GFG	CPP	Easy	O(1)
20	Count Triplets With Sum Smaller Than X5549	GFG	CPP Java	Medium	O(n2)
21	Find A Peak Element Ii	LC	Java		O(n3)
22	Find Closest Number To Zero	LC	Java		O(n)
23	Find First And Last Position Of Element In Sorted Array	LC	CPP Java		O(1)
24	Find K Closest Elements	LC	CPP Java		O(n)
25	Find Minimum In Rotated Sorted Array	LC	Java		O(n)
26	Find Minimum In Rotated Sorted Array Ii	LC	Java		O(n)
27	Find Missing And Repeating2512	GFG	CPP Java	Medium	O(n)
28	Find Pair Given Difference1559	GFG	CPP Java	Easy	O(n)
29	Find The Smallest Divisor Given A Threshold	LC	Java		O(n)
30	First Bad Version	LC	CPP Java		O(n)
31	Four Elements2452	GFG	CPP Java	Easy	O(1)
32	Guess Number Higher Or Lower	LC	CPP Java		O(n)
33	K Diff Pairs In An Array	LC	CPP Java		O(n)
34	K Th Element Of Two Sorted Array1317	GFG	CPP	Medium	O(1)
35	Koko Eating Bananas	LC	Java		O(n)
36	Kth Missing Positive Number	LC	Java		O(n)
37	Kth Smallest Number In Multiplication Table	LC	CPP Java		O(n)
38	Last Day Where You Can Still Cross	LC	Java		O(n2)
39	Maximum Distance Between A Pair Of Values	LC	Java		O(n)
40	Maximum Number Of Robots Within Budget	LC	Java		O(n)
41	Maximum Value In A Bitonic Array3001	GFG	Java	Easy	O(n)
42	Minimum Element In A Sorted And Rotated Array3611	GFG	Java	Easy	O(n)
43	Minimum Limit Of Balls In A Bag	LC	Java		O(n)
44	Minimum Number Of Days To Make M Bouquets	LC	Java		O(n)
45	Minimum Time To Complete Trips	LC	Java		O(n)
46	My Calendar I	LC	CPP		O(n2)
47	Number Of Pairs 1587115620	GFG	Java	Medium	O(n)
48	Pair With Given Sum In A Sorted Array4940	GFG	CPP Java	Easy	O(n)
49	Pair With Largest Sum Which Is Less Than K In The Array	GFG	CPP	null	O(1)
50	Range Frequency Queries	LC	Java		O(n2)
51	Search In Rotated Sorted Array	LC	CPP Java		O(1)
52	Search In Rotated Sorted Array Ii	LC	Java		O(n)
53	Search Insert Position Of K In A Sorted Array	GFG	CPP	Easy	O(1)
54	Searching In An Array Where Adjacent Differ By At Most K0456	GFG	CPP	Easy	O(1)
55	Sell Diminishing Valued Colored Balls	LC	Java		O(n)
56	Single Element In A Sorted Array	LC	Java		O(1)
57	Split Array Largest Sum	LC	Java		O(n)
58	Sqrtx	LC GFG	CPP Java	Medium	O(1)
59	Successful Pairs Of Spells And Potions	LC	Java		O(1)
60	The Painters Partition Problem1535	GFG	Java	Hard	O(n3)
61	Time Based Key Value Store	LC	Java		O(n2)
62	Triplet Sum In Array 1587115621	GFG	CPP Java	Medium	O(1)
63	Triplets With Sum With Given Range	GFG	CPP Java	Medium	O(n2)
64	Two Sum	LC	CPP Java		O(1)
65	Two Sum Ii Input Array Is Sorted	LC	CPP Java		O(1)
66	Valid Perfect Square	LC	Java		O(n)

Segment-Tree

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Range Sum Query Immutable	LC	Java		O(n)
2	Range Sum Query Mutable	LC	Java		O(n)
3	Smallest Subarrays With Maximum Bitwise Or	LC	Java		O(n2)
4	Sum Of Even Numbers After Queries	LC	Java		O(n)

Sorting

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	850	LC2	Java		O(n2)
2	920	LC2	Java		O(n)
3	Activity Selection 1587115620	GFG	Java	Easy	O(n)
4	Advantage Shuffle	LC	Java		O(n)
5	Arithmetic Subarrays	LC	Java		O(n3)
6	Bubble Sort	GFG	CPP Java	Easy	O(n2)
7	Counting Sort	GFG	CPP Java	Easy	O(n2)
8	Find All Pairs Whose Sum Is X5808	GFG	Java	Easy	O(n)
9	Heap Sort	GFG	CPP Java	Medium	O(1)
10	Insertion Sort	GFG	CPP Java	Easy	O(1)
11	Maximum Matching Of Players With Trainers	LC	Java		O(n)
12	Merge Sort	GFG	CPP Java	Medium	O(1)
13	Minimum Time Difference	LC	Java		O(n)
14	Nearly Sorted Algorithm	GFG	Java	Medium	O(n3)
15	Non Overlapping Intervals	LC	Java		O(n)
16	Number Of Pairs Satisfying Inequality	LC	Java		O(n2)
17	Quick Sort	GFG	CPP Java	Medium	O(1)
18	Selection Sort	GFG	CPP Java	Easy	O(n2)
19	Sort The People	LC	Java		O(n)

Stack

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Circular Greater Element To The Right	BS LC	CPP Java		O(1)
2	Wallstreet Bets	BS LC	CPP		O(1)
3	Car Fleet	LC	Java		O(n)
4	Count The Reversals0401	GFG	Java	Medium	O(n)
5	Daily Temperatures	LC	Java		O(n2)
6	Decode The String2444	GFG	Java	Easy	O(n)
7	Design A Stack With Increment Operation	LC	CPP Java		O(1)
8	Evaluate Reverse Polish Notation	LC	CPP Java		O(1)
9	Fab3dbbdce746976ba35c7b9b24afde40eae5a04	GFG	Java	Medium	O(n2)
10	Implement Stack Using Array	GFG	CPP	Basic	O(1)
11	Implement Stack Using Linked List	GFG	CPP	Basic	O(1)
12	Implement Stack Using Queues	LC GFG	Java	null	O(n)
13	Implement Two Stacks In An Array	GFG	CPP Java	Easy	O(1)
14	Infix To Postfix 1587115620	GFG	CPP Java	Easy	O(1)
15	Largest Rectangle In Histogram	LC GFG	Java	Medium	O(n)
16	Longest Absolute File Path	LC	Java		O(n)
17	Longest Valid Parentheses	LC	CPP Java		O(1)
18	Maximal Rectangle	LC	Java		O(n2)
19	Maximum Of Minimum For Every Window Size3453	GFG	CPP Java	Hard	O(1)
20	Min Stack	LC GFG	CPP Java	Easy	O(1)
21	Minimum Swaps For Bracket Balancing2704	GFG	Java	Easy	O(n2)
22	Next Greater Element I	LC	CPP Java		O(1)
23	Number Of Visible People In A Queue	LC	Java		O(n)
24	Online Stock Span	LC	CPP Java		O(1)
25	Remove All Adjacent Duplicates In String	LC	Java		O(n)
26	Remove All Adjacent Duplicates In String Ii	LC	Java		O(n2)
27	Removing Stars From A String	LC	Java		O(n2)
28	Simplify Path	LC	CPP Java		O(1)
29	Sort A Stack	GFG	CPP Java	Easy	O(1)
30	Stack Permutations	GFG	Java	Medium	O(n2)
31	Steps To Make Array Non Decreasing	LC	Java		O(1)
32	Stock Span Problem 1587115621	GFG	CPP Java	Medium	O(1)
33	The Celebrity Problem	GFG	CPP Java	Medium	O(n2)
34	Using A Robot To Print The Lexicographically Smallest String	LC	Java		O(n2)
35	Valid Parentheses	LC	CPP Java		O(1)
36	Validate Stack Sequences	LC	Java Python		O(n)

Strings

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	31272eef104840f7430ad9fd1d43b434a4b9596b	GFG	Java	null	O(n2)
2	856	LC2	Java		O(n)
3	927	LC2	Java		O(n)
4	Add Binary Numbers	BS	Java		O(n)
5	Bulk Shift Letters	BS	Java		O(n)
6	Largest Anagram Group	BS	Java		O(n)
7	Lexicographically Smallest Non Palindromic String	BS LC	CPP Java		O(1)
8	Lexicographically Smallest String Of Distance K	BS LC	CPP Java		O(1)
9	Longest 1s After One Flip	BS	CPP Java		O(1)
10	Roman Numeral To Integer	BS LC	CPP		O(1)
11	Sentence Reversal	BS	CPP		O(1)
12	Subsequence Strings	BS	Java		O(n)
13	Unique String Frequencies	BS LC	CPP Java		O(1)
14	Backspace String Compare	LC	Java		O(n)
15	Buddy Strings	LC	Java		O(n)
16	Camelcase Matching	LC	Java		O(n2)
17	Consecutive Characters	LC	CPP Java		O(n)
18	Convert A Sentence Into Its Equivalent Mobile Numeric Keypad Sequence0547	GFG	CPP	Easy	O(1)
19	Count And Say	LC	CPP Java		O(n2)
20	Count Asterisks	LC	CPP		O(1)
21	Count Number Of Homogenous Substrings	LC	CPP Java		O(n)
22	Count Number Of Substrings4528	GFG	Java	null	O(n2)
23	Count Palindrome Sub Strings Of A String0652	GFG	Java	Medium	O(n)
24	Count Prefixes Of A Given String	LC	Java		O(n)
25	Count Substrings That Differ By One Character	LC	Java		O(n3)
26	Count Words Obtained After Adding A Letter	LC	Java		O(n2)
27	Counting Words With A Given Prefix	LC	Java		O(n2)
28	Custom Sort String	LC	Java		O(n2)
29	Decode String	LC	Java		O(n)
30	Decode The Message	LC	CPP Java		O(n)
31	Delete Operation For Two Strings	LC	Java		O(n2)
32	Design A Text Editor	LC	Java		O(n)
33	Determine If Two Strings Are Close	LC	Java		O(n)
34	Distinct Palindromic Substrings5141	GFG	Java	Hard	O(n)
35	Divide A String Into Groups Of Size K	LC	Java		O(n2)
36	Find All Anagrams In A String	LC	CPP Java		O(n2)
37	Find First Repeated Character4108	GFG	CPP	Basic	O(1)
38	Find Resultant Array After Removing Anagrams	LC	Java		O(n2)
39	Find The Missing No In String	GFG	Java	null	O(n2)
40	First Letter To Appear Twice	LC	CPP Java		O(n)
41	First Non Repeating Character In A Stream1216	GFG	CPP Java	Medium	O(n2)
42	First Unique Character In A String	LC	CPP Java		O(n)
43	Flatten A Multilevel Doubly Linked List	LC	CPP		O(1)
44	Fraction Addition And Subtraction	LC	Java		O(n)
45	Generate A String With Characters That Have Odd Counts	LC	Java		O(n)
46	Get Equal Substrings Within Budget	LC	Java		O(n)
47	Goat Latin	LC	CPP Java		O(n)
48	Greatest English Letter In Upper And Lower Case	LC	Java		O(n)
49	Implement Atoi	GFG	Java	Medium	O(n)
50	Integer To Roman	LC	CPP		O(1)
51	Intersection Of Two Linked List	GFG	CPP	Easy	O(1)
52	Intersection Of Two Sorted Linked Lists	GFG	CPP	Easy	O(1)
53	Isomorphic Strings	LC GFG	Java	Easy	O(n)
54	Largest Rectangle In Histogram	LC GFG	CPP	Medium	O(1)
55	Longest Chunked Palindrome Decomposition	LC	Java		O(n)
56	Longest Even Length Substring	GFG	Java	Medium	O(n3)
57	Longest Happy Prefix	LC GFG	Java	Medium	O(n)
58	Longest Happy String	LC	Java		O(n)
59	Longest K Unique Characters Substring0853	GFG	Java	Easy	O(n2)
60	Longest Nice Substring	LC	Java		O(n2)
61	Longest Palindrome	LC	Java		O(n)
62	Longest Palindromic Substring	LC GFG GFG	CPP	null	O(1)
63	Longest Prefix Suffix2527	GFG	CPP	Medium	O(1)
64	Longest String Chain	LC	Java		O(n)
65	Longest Substring With At Least K Repeating Characters	LC	Java		O(n2)
66	Match Substring After Replacement	LC	Java		O(n2)
67	Maximize Number Of Subsequences In A String	LC	Java		O(n)
68	Maximum Deletions On A String	LC	Java		O(n)
69	Maximum Length Of A Concatenated String With Unique Characters	LC	Java		O(n)
70	Maximum Number Of Vowels In A Substring Of Given Length	LC	CPP Java		O(1)
71	Maximum Product Of Word Lengths	LC	Java		O(n2)
72	Minimum Changes To Make Alternating Binary String	LC	Java		O(n)
73	Minimum Indexed Character 1587115620	GFG	Java	Easy	O(n)
74	Minimum Length Of String After Deleting Similar Ends	LC	Java		O(n)
75	Minimum Number Of Frogs Croaking	LC	CPP Java		O(1)
76	Minimum Number Of Steps To Make Two Strings Anagram	LC	Java		O(n)
77	Minimum Number Of Steps To Make Two Strings Anagram Ii	LC	Java		O(n)
78	Minimum Recolors To Get K Consecutive Black Blocks	LC	Java		O(n)
79	Minimum Remove To Make Valid Parentheses	LC	Java		O(n2)
80	Minimum Window Substring	LC GFG	CPP Java	Medium	O(1)
81	Move Pieces To Obtain A String	LC	CPP Java		O(1)
82	Multiply Strings	LC	CPP Java		O(1)
83	Number Of Matching Subsequences	LC	Java		O(n2)
84	Number Of Substrings Containing All Three Characters	LC	Java		O(n2)
85	Number Of Substrings With Only 1s	LC	CPP Java		O(n)
86	Number Of Valid Clock Times	LC	Java		O(n)
87	Palindrome Pairs	LC	Java		O(n)
88	Palindrome String0817	GFG	CPP	Easy	O(1)
89	Permutation In String	LC	CPP Java		O(1)
90	Positions Of Large Groups	LC	Java		O(n)
91	Query Kth Smallest Trimmed Number	LC	CPP		O(1)
92	Rearrange Characters4649	GFG	Java	Medium	O(n2)
93	Rearrange Spaces Between Words	LC	CPP Java		O(1)
94	Remove All Duplicates From A Given String4321	GFG	Java	Easy	O(n)
95	Reorder Data In Log Files	LC	Java		O(1)
96	Reorganize String	LC	Java		O(n)
97	Repetition Of K Length Substring	GFG	Java	Easy	O(n)
98	Replace All Digits With Characters	LC	Java		O(n)
99	Replace The Substring For Balanced String	LC	Java		O(n2)
100	Reverse A String	GFG	CPP	Basic	O(1)
101	Reverse Only Letters	LC	Java		O(n2)
102	Reverse String Ii	LC	Java		O(n)
103	Reverse Substrings Between Each Pair Of Parentheses	LC	Java		O(n2)
104	Reverse Vowels Of A String	LC	Java		O(n2)
105	Rotate String	LC	CPP Java		O(1)
106	Run Length Encoding	GFG	Java	Easy	O(n)
107	Score Of Parentheses	LC	Java		O(n2)
108	Search Pattern0205	GFG	Java	null	O(n)
109	Sentence Similarity Iii	LC	Java		O(n)
110	Sherlock And Anagrams	HR	Java		O(n2)
111	Shifting Letters	LC	Java		O(n)
112	Shifting Letters Ii	LC	Java		O(n)
113	Shortest Palindrome	LC	Java		O(n2)
114	Smallest Distant Window3132	GFG	Java	Medium	O(n2)
115	Sort Characters By Frequency	LC	Java		O(n2)
116	String Compression	LC	Java		O(n)
117	String To Integer Atoi	LC GFG	CPP	Medium	O(1)
118	String Without Aaa Or Bbb	LC	Java		O(n)
119	Strong Password Checker Ii	LC	Java		O(n)
120	Substring With Concatenation Of All Words	LC	CPP		O(1)
121	Substrings Of Length K With K 1 Distinct Elements	GFG	Java	Medium	O(n)
122	Swap For Longest Repeated Character Substring	LC	Java		O(n3)
123	Text Justification	LC	CPP Java		O(1)
124	Total Appeal Of A String	LC	Java		O(n2)
125	Truncate Sentence	LC	Java		O(n)
126	Uncommon Words From Two Sentences	LC	CPP		O(1)
127	Unique Morse Code Words	LC			O(1)
128	Valid Anagram	LC	CPP Java		O(n)
129	Valid Number	LC	CPP Java		O(1)
130	Valid Palindrome	LC	CPP Java		O(n)
131	Valid Palindrome Ii	LC	CPP Java		O(n)
132	Validate An Ip Address 1587115621	GFG	CPP Java	Medium	O(1)
133	Validate Ip Address	LC	Java		O(n2)
134	Verifying An Alien Dictionary	LC	CPP Java		O(n)
135	Vowels Of All Substrings	LC	Java		O(n2)
136	Word Pattern	LC	Java		O(n)

Tree

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Binary Tree To Linked List	BS	Java		O(1)
2	Count Nodes In Complete Binary Tree	BS LC	Java		O(n)
3	Delete Even Leaves	BS	Java		O(1)
4	Elephant Tree	BS GFG	CPP Java	Easy	O(1)
5	Height Balanced Tree	BS	Java		O(1)
6	Inorder Successor	BS	CPP Java		O(1)
7	Largest Tree Sum Path	BS	Java		O(n)
8	Leaves In Same Level	BS GFG	Java	Easy	O(1)
9	Longest Tree Sum Path From Root To Leaf	BS	Java		O(1)
10	Lowest Common Ancestor	BS GFG GFG	Java	Medium	O(n)
11	Merging Binary Trees	BS	Java		O(1)
12	Most Frequent Subtree Sum	BS LC	Java		O(n)
13	Partition Tree	BS	Java		O(n2)
14	Subtree With Maximum Value	BS	Java		O(1)
15	Sum Tree	BS	Java		O(1)
16	Symmetric Binary Tree	BS LC	Java		O(1)
17	Tree Pruning	BS	Java		O(1)
18	Univalue Tree	BS	Java		O(1)
19	Add All Greater Values To Every Node In A Bst	GFG	CPP Java	Medium	O(1)
20	Add One Row To Tree	LC	Java		O(1)
21	All Elements In Two Binary Search Trees	LC	Java		O(1)
22	All Nodes Distance K In Binary Tree	LC	Java		O(n3)
23	Amount Of Time For Binary Tree To Be Infected	LC GFG	CPP Java	Hard	O(n3)
24	Balance A Binary Search Tree	LC	Java		O(1)
25	Balanced Binary Tree	LC	CPP Java		O(1)
26	Binary Search Tree Iterator	LC	CPP Java		O(n)
27	Binary Search Tree To Greater Sum Tree	LC	Java		O(1)
28	Binary Tree Cameras	LC	Java		O(1)
29	Binary Tree Inorder Traversal	LC GFG	CPP	Medium	O(1)
30	Binary Tree K Level Sum3857	GFG	Java	Easy	O(n2)
31	Binary Tree Level Order Traversal	LC GFG	CPP Java	Easy	O(1)
32	Binary Tree Maximum Path Sum	LC GFG	Java	Medium	O(1)
33	Binary Tree Paths	LC	Java		O(1)
34	Binary Tree Postorder Traversal	LC GFG	CPP	Medium	O(1)
35	Binary Tree Preorder Traversal	LC GFG	CPP	Medium	O(1)
36	Binary Tree Pruning	LC	Java		O(1)
37	Binary Tree Tilt	LC	Java		O(1)
38	Binary Tree To Bst	GFG	CPP Java	Easy	O(1)
39	Binary Tree To Dll	GFG	CPP Java	Hard	O(1)
40	Binary Tree Zigzag Level Order Traversal	LC	CPP Java		O(1)
41	Bottom View Of Binary Tree	GFG	CPP Java	Medium	O(n)
42	Boundary Traversal Of Binary Tree	GFG	CPP Java	Medium	O(1)
43	Brothers From Different Root	GFG	CPP Java	Easy	O(n)
44	Bst To Greater Sum Tree	GFG	Java	Medium	O(1)
45	Check Completeness Of A Binary Tree	LC	Java		O(n)
46	Check For Balanced Tree	GFG	CPP	Easy	O(1)
47	Check If Subtree	GFG	Java	Medium	O(n)
48	Check If Tree Is Isomorphic	GFG	Java	Easy	O(1)
49	Check Mirror In N Ary Tree1528	GFG	Java	Medium	O(n2)
50	Check Whether Bst Contains Dead End	GFG	CPP Java	Easy	O(1)
51	Children Sum Parent	GFG	CPP	Easy	O(1)
52	Complete Binary Tree	GFG	Java	Medium	O(n2)
53	Complete Binary Tree Inserter	LC	Java		O(n)
54	Connect Nodes At Same Level	GFG	Java	Medium	O(n)
55	Construct Binary Search Tree From Preorder Traversal	LC GFG [LC](leetcode 1008, https://leetcode.com/problems/construct-binary-search-tree-from-preorder-traversal/)	CPP Java	Medium	O(n)
56	Construct Binary Tree From Preorder And Postorder Traversal	LC	Java		O(n)
57	Construct Binary Tree From String	LC GFG LC2	CPP	Medium	O(1)
58	Construct Binary Tree From String With Bracket Representation	GFG	Java	Medium	O(n)
59	Construct String From Binary Tree	LC	CPP Java		O(1)
60	Convert Sorted Array To Binary Search Tree	LC	CPP Java		O(1)
61	Count Bst Nodes That Lie In A Given Range	GFG	CPP Java	Medium	O(1)
62	Count Good Nodes In Binary Tree	LC	CPP Java		O(1)
63	Count Nodes Equal To Average Of Subtree	LC	Java		O(1)
64	Count Nodes With The Highest Score	LC	Java		O(n)
65	Count Number Of Subtrees Having Given Sum	GFG	Java	Medium	O(1)
66	Cousins In Binary Tree	LC	CPP Java		O(n2)
67	Cousins Of A Given Node	GFG	Java	Medium	O(n2)
68	Create Binary Tree From Descriptions	LC	Java		O(n)
69	Deepest Leaves Sum	LC	Java		O(1)
70	Delete Leaves With A Given Value	LC	Java		O(1)
71	Delete Node In A Bst	LC	CPP Java		O(n)
72	Delete Nodes And Return Forest	LC	Java		O(n)
73	Determine If Two Trees Are Identical	GFG	CPP Java	Easy	O(1)
74	Diagonal Traversal Of Binary Tree	GFG	CPP Java	Medium	O(n2)
75	Diameter Of Binary Tree	GFG	CPP Java	Easy	O(1)
76	Distribute Coins In Binary Tree	LC GFG	Java	null	O(1)
77	Duplicate Subtree In Binary Tree	GFG	CPP Java	Medium	O(n4)
78	Evaluate Boolean Binary Tree	LC	Java		O(1)
79	Even Odd Tree	LC	Java		O(n)
80	Expression Tree	GFG	Java	Easy	O(1)
81	Ffd66b6a0bf7cefb9987fa455974b6ea5695709e	GFG	Java	Easy	O(n2)
82	Find A Corresponding Node Of A Binary Tree In A Clone Of That Tree	LC	Java		O(1)
83	Find A Pair With Given Target In Bst	GFG	CPP Java	Medium	O(n)
84	Find Duplicate Subtrees	LC	CPP Java		O(n)
85	Find Largest Value In Each Tree Row	LC	Java		O(n2)
86	Find Mode In Binary Search Tree	LC	CPP Java		O(n)
87	Find The Closest Element In Bst	GFG	CPP Java	Medium	O(n)
88	Find The Distance Between Two Nodes4402	GFG	Java	Easy	O(n)
89	Flatten Binary Tree To Linked List	LC	CPP Java		O(n2)
90	Flip Binary Tree To Match Preorder Traversal	LC	Java		O(1)
91	Foldable Binary Tree	GFG	Java	Medium	O(1)
92	Increasing Order Search Tree	LC	Java		O(n)
93	Inorder Successor In Bst	GFG	CPP Java	Easy	O(1)
94	Inorder Traversal Iterative	GFG	Java	Medium	O(n)
95	Insert Into A Binary Search Tree	LC	CPP Java		O(1)
96	Insufficient Nodes In Root To Leaf Paths	LC	Java		O(1)
97	Invert Binary Tree	LC	CPP		O(1)
98	Kth Largest Element In Bst	GFG	CPP	Easy	O(1)
99	Kth Smallest Element In A Bst	LC GFG	CPP Java	Easy	O(1)
100	Largest Bst Subtree	LC GFG	CPP Java	Medium	O(1)
101	Largest Subtree Sum In A Tree	GFG	Java	Hard	O(1)
102	Largest Value In Each Level	GFG	Java	Easy	O(n2)
103	Leaf At Same Level	GFG	CPP	Easy	O(1)
104	Leaf Similar Trees	LC	Java		O(n2)
105	Left View Of Binary Tree	GFG	CPP Java	Easy	O(1)
106	Linked List In Binary Tree	LC	Java		O(1)
107	Longest Path With Different Adjacent Characters	LC	Java		O(n)
108	Longest Univalue Path	LC	Java		O(1)
109	Longest Zigzag Path In A Binary Tree	LC	Java		O(1)
110	Lowest Common Ancestor Of A Binary Search Tree	LC GFG	CPP	Easy	O(1)
111	Lowest Common Ancestor Of A Binary Tree	LC GFG	CPP	Medium	O(1)
112	Lowest Common Ancestor Of Deepest Leaves	LC	CPP Java		O(1)
113	Maximum Binary Tree	LC	Java		O(n)
114	Maximum Binary Tree Ii	LC	Java		O(n)
115	Maximum Depth Of Binary Tree	LC	CPP Java		O(1)
116	Maximum Difference Between Node And Ancestor	LC GFG	CPP Java	Medium	O(1)
117	Maximum Level Sum Of A Binary Tree	LC	CPP Java		O(1)
118	Maximum Path Sum	GFG	Java	Hard	O(1)
119	Maximum Product Of Splitted Binary Tree	LC	Java		O(1)
120	Maximum Sum Bst In Binary Tree	LC	CPP Java		O(1)
121	Maximum Sum Leaf To Root Path	GFG	Java	Medium	O(1)
122	Maximum Width Of Binary Tree	LC	Java		O(n2)
123	Maximum Width Of Tree	GFG	Java	Easy	O(n2)
124	Merge Bsts To Create Single Bst	LC	Java		O(n)
125	Merge Two Binary Trees	LC	CPP Java		O(1)
126	Merge Two Bst S	GFG	CPP Java	Hard	O(1)
127	Min Distance Between Two Given Nodes Of A Binary Tree	GFG	CPP Java	Medium	O(1)
128	Minimum Height Trees	LC	Java		O(n2)
129	Minimum Swap Required To Convert Binary Tree To Binary Search Tree	GFG	Java	Hard	O(n2)
130	Minimum Time To Collect All Apples In A Tree	LC	Java		O(1)
131	Mirror Tree	GFG	CPP Java	Easy	O(1)
132	N Ary Tree Level Order Traversal	LC	CPP Java		O(1)
133	N Ary Tree Postorder Traversal	LC	CPP Java		O(1)
134	N Ary Tree Preorder Traversal	LC	CPP Java		O(1)
135	Next Right Node	GFG	CPP	Easy	O(1)
136	Node At Distance	GFG	Java	Medium	O(1)
137	Nodes At Given Distance In Binary Tree	GFG	Java	Hard	O(n)
138	Number Of Good Leaf Nodes Pairs	LC	Java		O(n2)
139	Number Of Nodes In The Sub Tree With The Same Label	LC	Java		O(n2)
140	Number Of Turns In Binary Tree	GFG	Java	Hard	O(1)
141	Odd Even Level Difference	GFG	Java	Easy	O(n2)
142	Pairs Violating Bst Property	GFG	Java	Medium	O(n)
143	Path In Zigzag Labelled Binary Tree	LC	Java		O(n)
144	Path Sum	LC	CPP Java		O(1)
145	Path Sum Ii	LC	CPP Java		O(n)
146	Path Sum Iii	LC GFG	CPP Java	Medium	O(1)
147	Paths From Root With A Specified Sum	GFG	Java	Medium	O(n2)
148	Populate Inorder Successor For All Nodes	GFG	CPP Java	Medium	O(1)
149	Populating Next Right Pointers In Each Node	LC	CPP Java		O(1)
150	Populating Next Right Pointers In Each Node Ii	LC GFG	CPP Java	Medium	O(1)
151	Postorder Traversal Iterative	GFG	Java	Medium	O(n)
152	Predecessor And Successor	GFG	Java	Easy	O(1)
153	Preorder Traversal And Bst4006	GFG	CPP Java	Medium	O(n)
154	Preorder Traversal Iterative	GFG	CPP Java	Medium	O(1)
155	Print A Binary Tree In Vertical Order	GFG	CPP	Medium	O(1)
156	Print Binary Tree	LC	Java		O(n2)
157	Print Nodes Having K Leaves	GFG	Java	Medium	O(1)
158	Pseudo Palindromic Paths In A Binary Tree	LC	Java		O(n)
159	Recover A Tree From Preorder Traversal	LC	Java		O(n2)
160	Recover Binary Search Tree	LC GFG	Java	null	O(n2)
161	Remove Bst Keys Outside Given Range	GFG	CPP Java	Medium	O(1)
162	Reverse Level Order Traversal	GFG	CPP Java	Easy	O(1)
163	Reverse Odd Levels Of Binary Tree	LC	Java		O(n2)
164	Right View Of Binary Tree	GFG	CPP Java	Easy	O(1)
165	Second Minimum Node In A Binary Tree	LC	Java		O(1)
166	Serialize And Deserialize Binary Tree	LC GFG	CPP Java	Medium	O(1)
167	Serialize And Deserialize Bst	LC	CPP		O(1)
168	Single Valued Subtree	GFG	Java	Medium	O(1)
169	Smallest String Starting From Leaf	LC	Java		O(n)
170	Smallest Subtree With All The Deepest Nodes	LC	CPP Java		O(1)
171	Step By Step Directions From A Binary Tree Node To Another	LC	Java		O(n)
172	Subtree Of Another Tree	LC	Java		O(1)
173	Sum Of Binary Tree	GFG	Java	Basic	O(1)
174	Sum Of K Smallest Elements In Bst3029	GFG	Java	Easy	O(n)
175	Sum Of Nodes With Even Valued Grandparent	LC	Java		O(1)
176	Sum Of Root To Leaf Binary Numbers	LC	Java		O(1)
177	Sum Of The Longest Bloodline Of A Tree	GFG	CPP Java	Easy	O(1)
178	Sum Root To Leaf Numbers	LC	Java		O(n)
179	Sum Tree	GFG	CPP Java	Medium	O(1)
180	Symmetric Tree	GFG	CPP Java	Easy	O(1)
181	Top View Of Binary Tree	GFG	CPP Java	Medium	O(1)
182	Tree From Postorder And Inorder	GFG	CPP Java	Medium	O(n)
183	Trim A Binary Search Tree	LC	CPP Java		O(1)
184	Two Mirror Trees	GFG	Java	Easy	O(n2)
185	Unique Binary Search Trees	LC GFG	CPP Java	Medium	O(1)
186	Unique Binary Search Trees Ii	LC	CPP Java		O(1)
187	Validate Binary Search Tree	LC	CPP Java		O(1)
188	Validate Binary Tree Nodes	LC	Java		O(n)
189	Verify Preorder Serialization Of A Binary Tree	LC	Java		O(1)
190	Vertical Order Traversal Of A Binary Tree	LC GFG	Java	Medium	O(n2)

Trie

#	Title	Links	Solution	Difficulty	Time Complexity	Space Complexity
1	Distinct Substrings	BS GFG	CPP Java	Medium	O(1)
2	Concatenated Words	LC	Java		O(n)
3	Design Add And Search Words Data Structure	LC	CPP		O(1)
4	Implement Trie Prefix Tree	LC	CPP Java		O(1)
5	Map Sum Pairs	LC	Java		O(n)
6	Maximum Xor Of Two Numbers In An Array	LC	CPP Java		O(1)
7	Maximum Xor With An Element From Array	LC	CPP		O(1)
8	Minimum Xor Value Pair	GFG	CPP Java	Medium	O(1)
9	Palindrome Pairs	GFG	Java	Hard	O(n)
10	Phone Directory4628	GFG	CPP Java	Hard	O(1)
11	Prefix And Suffix Search	LC	Java		O(n2)
12	Replace Words	LC	Java		O(n2)
13	Search Suggestions System	LC	Java		O(n)
14	Short Encoding Of Words	LC	CPP Java		O(1)
15	Shortest Unique Prefix For Every Word	GFG	CPP Java	Hard	O(1)
16	Stream Of Characters	LC	CPP Java		O(1)
17	Sum Of Prefix Scores Of Strings	LC	Java		O(n)
18	Trie Delete	GFG	CPP Java	Medium	O(1)
19	Trie Insert And Search0651	GFG	CPP Java	Medium	O(1)
20	Unique Rows In Boolean Matrix	GFG	CPP Java	Easy	O(1)