LeetCode-in-Cpp

Cpp-based LeetCode algorithm problem solutions, regularly updated.

"For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."

• Graph Theory I
• SQL I
• Level 1
• Level 2
• Udemy
• Data Structure I
• Data Structure II
• Algorithm I
• Algorithm II
• Binary Search I
• Binary Search II
• Dynamic Programming I
• Programming Skills I
• Programming Skills II

Graph Theory I

Day 1 Matrix Related Problems

0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	19	97.48

Day 2 Matrix Related Problems

Day 3 Matrix Related Problems

Day 4 Matrix Related Problems

Day 5 Matrix Related Problems

Day 6 Matrix Related Problems

Day 7 Standard Traversal

Day 8 Standard Traversal

Day 9 Standard Traversal

Day 10 Standard Traversal

Day 11 Breadth First Search

Day 12 Breadth First Search

Day 13 Graph Theory

Day 14 Graph Theory

SQL I

Day 1 Select

Day 2 Select and Order

Day 3 String Processing Functions

Day 4 Union and Select

Day 5 Union

Day 6 Union

Day 7 Function

Day 8 Function

Day 9 Control of Flow

Day 10 Where

Level 1

Day 1 Prefix Sum

Day 2 String

Day 3 Linked List

0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	0	100.00
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	0	100.00

Day 4 Linked List

Day 5 Greedy

Day 6 Tree

Day 7 Binary Search

Day 8 Binary Search Tree

Day 9 Graph/BFS/DFS

0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	19	97.48

Day 10 Dynamic Programming

0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	0	100.00

Day 11 Dynamic Programming

0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n)	0	100.00

Day 12 Sliding Window/Two Pointer

0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1)	0	100.00

Day 13 Hashmap

0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)	4	94.42

Day 14 Stack

0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n)	0	100.00

Day 15 Heap

Level 2

Day 1 Implementation/Simulation

Day 2 String

Day 3 Linked List

0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L)	0	100.00
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	154	83.63

Day 4 Linked List

Day 5 Greedy

Day 6 Tree

0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	2	45.75

Day 7 Tree

0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	4	95.38
0437	Path Sum III	Medium	Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	15	70.45

Day 8 Binary Search

0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	0	100.00
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00

Day 9 Binary Search Tree

0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n)	7	94.52

Day 10 Graph/BFS/DFS

Day 11 Graph/BFS/DFS

Day 12 Dynamic Programming

0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	2	40.41
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	12	97.65

Day 13 Dynamic Programming

0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums)	199	41.03

Day 14 Sliding Window/Two Pointer

0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1)	5	86.87
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(s.length())_Space_O(1)	5	91.46

Day 15 Tree

Day 16 Design

0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)	57	37.76

Day 17 Interval

0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	19	85.51

Day 18 Stack

Day 19 Union Find

Day 20 Brute Force/Backtracking

0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n)	0	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!)	0	100.00

Udemy

Udemy Integers

0007	Reverse Integer	Medium	Top_Interview_Questions, Math	0	100.00
0009	Palindrome Number	Easy	Math	0	100.00

Udemy Strings

0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1)	5	86.87
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)	0	100.00
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	7	94.72
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n)	0	100.00
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n)	18	96.16

Udemy Binary Search

0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00

Udemy Arrays

0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	6	98.89
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)	4	94.42
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	18	77.84
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	31	96.95
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	0	100.00
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n)	21	88.52
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)	42	69.19
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Big_O_Time_O(n*k)_Space_O(n+k)	164	80.55

Udemy Two Pointers

0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1)	3	99.04
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	53	90.17

Udemy Famous Algorithm

0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	65	93.14
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	10	95.79

Udemy Sorting Algorithms

Udemy 2D Arrays/Matrix

0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	0	100.00
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1)	0	100.00
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m*n)_Space_O(1)	7	83.11
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	19	85.51

Udemy Linked List

0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	0	100.00
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	0	100.00
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	0	100.00
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1)	30	96.07
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	154	83.63
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k)	3	98.79

Udemy Tree Stack Queue

0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n)	0	100.00
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	4	95.38
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	2	45.75
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	13	55.40

Udemy Trie and Heap

0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)	57	37.76

Udemy Graph

0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	19	97.48

Udemy Dynamic Programming

0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	2	40.41
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	0	100.00
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	2	95.63
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	4	94.11
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	23	62.70
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	0	100.00
0010	Regular Expression Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m*n)_Space_O(m*n)	0	100.00

Udemy Backtracking/Recursion

0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n)	0	100.00
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n)	0	100.00
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n)	0	100.00
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n)	0	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!)	0	100.00

Udemy Bit Manipulation

0338	Counting Bits	Easy	Dynamic_Programming, Bit_Manipulation, Big_O_Time_O(num)_Space_O(num)	0	100.00

Udemy Design

Data Structure I

Day 1 Array

0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	65	93.14

Day 2 Array

0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)	4	94.42

Day 3 Array

Day 4 Array

Day 5 Array

0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	0	100.00

Day 6 String

Day 7 Linked List

0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	0	100.00

Day 8 Linked List

0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	0	100.00

Day 9 Stack Queue

0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)	0	100.00

Day 10 Tree

0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n)	0	100.00

Day 11 Tree

Day 12 Tree

0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	2	45.75

Day 13 Tree

Day 14 Tree

Data Structure II

Day 1 Array

0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	10	95.79
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	53	90.17

Day 2 Array

0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	0	100.00
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	19	85.51

Day 3 Array

0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1)	0	100.00

Day 4 Array

0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1)	40	84.33

Day 5 Array

0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n)	21	88.52
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Big_O_Time_O(n)_Space_O(n)	54	92.60

Day 6 String

Day 7 String

0763	Partition Labels	Medium	String, Hash_Table, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	0	100.00

Day 8 String

0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n)	18	96.16

Day 9 String

0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	7	94.72

Day 10 Linked List

0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M))	16	82.17

Day 11 Linked List

0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1)	30	96.07

Day 12 Linked List

0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	0	100.00

Day 13 Linked List

0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k)	3	98.79

Day 14 Stack Queue

Day 15 Tree

Day 16 Tree

Day 17 Tree

0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n)	7	94.52

Day 18 Tree

0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	13	55.40

Day 19 Graph

Day 20 Heap Priority Queue

0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Big_O_Time_O(n*log(n))_Space_O(log(n))	74	91.60
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Big_O_Time_O(n*log(n))_Space_O(k)	11	69.14

Day 21 Heap Priority Queue

Algorithm I

Day 1 Binary Search

0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00

Day 2 Two Pointers

0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	18	77.84

Day 3 Two Pointers

0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	6	98.89

Day 4 Two Pointers

Day 5 Two Pointers

0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L)	0	100.00

Day 6 Sliding Window

0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1)	5	86.87

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Breadth First Search Depth First Search

Day 10 Recursion Backtracking

0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	0	100.00
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	0	100.00

Day 11 Recursion Backtracking

0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!)	0	100.00

Day 12 Dynamic Programming

0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	0	100.00
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	2	40.41

Day 13 Bit Manipulation

Day 14 Bit Manipulation

Algorithm II

Day 1 Binary Search

0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	0	100.00

Day 2 Binary Search

Day 3 Two Pointers

0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	53	90.17

Day 4 Two Pointers

0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	54	88.17

Day 5 Sliding Window

0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1)	0	100.00

Day 6 Breadth First Search Depth First Search

0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	19	97.48

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Recursion Backtracking

0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n)	0	100.00

Day 10 Recursion Backtracking

0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n)	0	100.00

Day 11 Recursion Backtracking

0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n)	0	100.00
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n)	0	100.00
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n)	391	63.85

Day 12 Dynamic Programming

0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	31	96.95

Day 13 Dynamic Programming

0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	8	82.92
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n)	0	100.00

Day 14 Dynamic Programming

0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	7	94.72

Day 15 Dynamic Programming

Day 16 Dynamic Programming

0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	4	94.11

Day 17 Dynamic Programming

1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	23	62.70

Day 18 Dynamic Programming

0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	0	100.00
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	12	97.65

Day 19 Bit Manipulation

Day 20 Others

Day 21 Others

Binary Search I

Day 1

Day 2

0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00

Day 3

Day 4

Day 5

0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00

Day 6

Day 7

Day 8

0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	0	100.00

Day 9

Day 10

Day 11

0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00

Day 12

Binary Search II

Day 1

Day 2

Day 3

0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	4	94.11

Day 4

Day 5

0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Big_O_Time_O(n)_Space_O(n)	74	75.71

Day 6

Day 7

Day 8

0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1)	40	84.33

Day 9

Day 10

Day 11

Day 12

Day 13

Day 14

Day 15

Day 16

Day 17

Day 18

Day 19

Day 20

Dynamic Programming I

Day 1

Day 2

0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	0	100.00

Day 3

0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	2	40.41

Day 4

0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	31	96.95
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	8	82.92

Day 5

0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	65	93.14

Day 6

Day 7

Day 8

Day 9

0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1)	3	99.04

Day 10

Day 11

Day 12

Day 13

Day 14

Day 15

0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n)	0	100.00

Day 16

0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	2	95.63
0221	Maximal Square	Medium	Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	56	84.56

Day 17

0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	7	94.72

Day 18

0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	4	94.11

Day 19

1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	23	62.70
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	0	100.00

Day 20

0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	12	97.65

Day 21

Programming Skills I

Day 1 Basic Data Type

Day 2 Operator

Day 3 Conditional Statements

Day 4 Loop

Day 5 Function

Day 6 Array

0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	6	98.89

Day 7 Array

Day 8 String

Day 9 String

Day 10 Linked List and Tree

Day 11 Containers and Libraries

Day 12 Class and Object

Programming Skills II

Day 1

Day 2

Day 3

Day 4

Day 5

Day 6

0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(n)	103	91.31

Day 7

0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1)	0	100.00

Day 8

Day 9

Day 10

Day 11

0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n)	18	96.16

Day 12

0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1)	0	100.00

Day 13

Day 14

Day 15

0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M))	16	82.17

Day 16

Day 17

Day 18

Day 19

Day 20

Algorithms

#	Title	Difficulty	Tag	Time, ms	Time, %
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	23	62.70
0763	Partition Labels	Medium	String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String, Big_O_Time_O(n)_Space_O(1)	0	100.00
0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6, Big_O_Time_O(n)_Space_O(n)	103	91.31
0647	Palindromic Substrings	Medium	String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n)	3	94.97
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array, Big_O_Time_O(n)_Space_O(n)	54	92.60
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	4	95.38
0494	Target Sum	Medium	Array, Dynamic_Programming, Backtracking, Big_O_Time_O(n*(sum+s))_Space_O(n*(sum+s))	8	70.29
0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer, Big_O_Time_O(n+m)_Space_O(1)	0	100.00
0437	Path Sum III	Medium	Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n)	15	70.45
0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums)	199	41.03
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)	0	100.00
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(k)	11	69.14
0338	Counting Bits	Easy	Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation, Big_O_Time_O(num)_Space_O(num)	0	100.00
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(amount)	12	97.65
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming, Big_O_Time_O(n*log_n)_Space_O(n)	4	94.11
0295	Find Median from Data Stream	Hard	Top_100_Liked_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream, Big_O_Time_O(n*log_n)_Space_O(n)	231	98.67
0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5, Big_O_Time_O(n)_Space_O(n)	74	75.71
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	6	98.89
0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8, Big_O_Time_O(n+m)_Space_O(1)	40	84.33
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays, Big_O_Time_O(n*k)_Space_O(n+k)	164	80.55
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays, Big_O_Time_O(n^2)_Space_O(n)	21	88.52
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	13	55.40
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1)	154	83.63
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n)	7	94.52
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	2	45.75
0221	Maximal Square	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Big_O_Time_O(m*n)_Space_O(m*n)	56	84.56
0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(log(n))	74	91.60
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)	57	37.76
0207	Course Schedule	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Big_O_Time_O(N)_Space_O(N)	15	70.71
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1)	0	100.00
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS, Udemy_Graph, Big_O_Time_O(M*N)_Space_O(M*N)	19	97.48
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Level_2_Day_12_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	2	40.41
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	18	77.84
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1)	10	95.79
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List, Big_O_Time_O(M+N)_Space_O(1)	30	96.07
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	0	100.00
0084	Largest Rectangle in Histogram	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n_log_n)_Space_O(log_n)	89	95.11
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n)	391	63.85
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n*2^n)	0	100.00
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Big_O_Time_O(s.length())_Space_O(1)	5	91.46
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	0	100.00
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	0	100.00
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix, Big_O_Time_O(m*n)_Space_O(1)	7	83.11
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	0	100.00
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	0	100.00
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)	2	95.63
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)	0	100.00
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n_log_n)_Space_O(n)	19	85.51
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	31	96.95
0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1)	65	93.14
0051	N-Queens	Hard	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(N!)_Space_O(N)	3	80.52
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings, Big_O_Time_O(n*k_log_k)_Space_O(n)	18	96.16
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n^2)_Space_O(1)	0	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(n*n!)_Space_O(n+n!)	0	100.00
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4, Big_O_Time_O(n)_Space_O(1)	8	82.92
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers, Big_O_Time_O(n)_Space_O(1)	3	99.04
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n)	42	69.19
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n+2^n)	0	100.00
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2, Big_O_Time_O(log_n)_Space_O(1)	0	100.00
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5, Big_O_Time_O(log_n)_Space_O(1)	0	100.00
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11, Level_2_Day_8_Binary_Search, Udemy_Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	0	100.00
0032	Longest Valid Parentheses	Hard	Top_100_Liked_Questions, String, Dynamic_Programming, Stack, Big_O_Time_O(n)_Space_O(1)	0	100.00
0031	Next Permutation	Medium	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	0	100.00
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(k)	3	98.79
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1)	0	100.00
0023	Merge k Sorted Lists	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(k*n*log(k))_Space_O(log(k))	7	98.72
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n)	0	100.00
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(m+n)_Space_O(m+n)	0	100.00
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)	0	100.00
0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List, Big_O_Time_O(L)_Space_O(L)	0	100.00
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(4^n)_Space_O(n)	0	100.00
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers, Udemy_Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	53	90.17
0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers, Big_O_Time_O(n)_Space_O(1)	54	88.17
0010	Regular Expression Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)	0	100.00
0009	Palindrome Number	Easy	Math, Udemy_Integers	0	100.00
0008	String to Integer (atoi)	Medium	Top_Interview_Questions, String	0	100.00
0007	Reverse Integer	Medium	Top_Interview_Questions, Math, Udemy_Integers	0	100.00
0006	Zigzag Conversion	Medium	String	3	97.69
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)	7	94.72
0004	Median of Two Sorted Arrays	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer, Big_O_Time_O(log(min(N,M)))_Space_O(1)	19	85.75
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Udemy_Strings, Big_O_Time_O(n)_Space_O(1)	5	86.87
0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15, Big_O_Time_O(max(N,M))_Space_O(max(N,M))	16	82.17
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n)	4	94.42

Contributing

Your ideas/fixes/algorithms are more than welcome!

1. Fork this repo
2. Clone your forked repo (git clone https://github.com/YOUR_GITHUB_USERNAME/LeetCode-in-Cpp.git) onto your local machine
3. cd into your cloned directory, create your feature branch (git checkout -b my-awesome-fix)
4. git add your desired changes to this repo
5. Commit your changes (git commit -m 'Added some awesome features/fixes')
6. Push to the branch (git push origin my-awesome-feature)
7. Open your forked repo on Github website, create a new Pull Request to this repo!