LeetCode Problems & Solutions

This repository contains solutions to LeetCode problems.

Algorithms

Completed 19 out of 1902 (unpaid) problems

No.	Problem	Difficulty	Languages
1	Two Sum
2	Add Two Numbers
3	Longest Substring Without Repeating Characters
4	Median of Two Sorted Arrays
5	Longest Palindromic Substring
6	Zigzag Conversion
7	Reverse Integer
8	String to Integer (atoi)
9	Palindrome Number
10	Regular Expression Matching
11	Container With Most Water
12	Integer to Roman
13	Roman to Integer
14	Longest Common Prefix
15	3Sum
16	3Sum Closest
17	Letter Combinations of a Phone Number
23	Merge k Sorted Lists
25	Reverse Nodes in k-Group

Database

Completed 36 out of 45 (unpaid) problems

No.	Problem	Difficulty	Languages
175	Combine Two Tables
176	Second Highest Salary
177	Nth Highest Salary
178	Rank Scores
180	Consecutive Numbers
181	Employees Earning More Than Their Managers
182	Duplicate Emails
183	Customers Who Never Order
184	Department Highest Salary
185	Department Top Three Salaries
196	Delete Duplicate Emails
197	Rising Temperature
262	Trips and Users
511	Game Play Analysis I
584	Find Customer Referee
586	Customer Placing the Largest Number of Orders
595	Big Countries
596	Classes More Than 5 Students
601	Human Traffic of Stadium
607	Sales Person
608	Tree Node
620	Not Boring Movies
626	Exchange Seats
627	Swap Salary
1050	Actors and Directors Who Cooperated At Least Three Times
1084	Sales Analysis III
1141	User Activity for the Past 30 Days I
1148	Article Views I
1179	Reformat Department Table
1393	Capital Gain/Loss
1407	Top Travellers
1484	Group Sold Products By The Date
1527	Patients With a Condition
1581	Customer Who Visited but Did Not Make Any Transactions
1587	Bank Account Summary II
1667	Fix Names in a Table

Shell

Completed 2 out of 4 (unpaid) problems

No.	Problem	Difficulty	Languages
192	Word Frequency
193	Valid Phone Numbers

Concurrency

Completed 6 out of 6 (unpaid) problems

No.	Problem	Difficulty	Languages
1114	Print in Order
1115	Print FooBar Alternately
1116	Print Zero Even Odd
1117	Building H2O
1195	Fizz Buzz Multithreaded
1226	The Dining Philosophers