LeetCode Problems & Solutions

This repository contains solutions to LeetCode problems.

Algorithms

Completed 67 out of 2760 (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
19	Remove Nth Node From End of List
20	Valid Parentheses
21	Merge Two Sorted Lists
23	Merge k Sorted Lists
25	Reverse Nodes in k-Group
33	Search in Rotated Sorted Array
39	Combination Sum
48	Rotate Image
49	Group Anagrams
53	Maximum Subarray
54	Spiral Matrix
55	Jump Game
56	Merge Intervals
57	Insert Interval
59	Spiral Matrix II
62	Unique Paths
68	Text Justification
70	Climbing Stairs
76	Minimum Window Substring
128	Longest Consecutive Sequence
133	Clone Graph
139	Word Break
141	Linked List Cycle
143	Reorder List
152	Maximum Product Subarray
153	Find Minimum in Rotated Sorted Array
190	Reverse Bits
191	Number of 1 Bits
198	House Robber
215	Kth Largest Element in an Array
224	Basic Calculator
230	Kth Smallest Element in a BST
268	Missing Number
295	Find Median from Data Stream
297	Serialize and Deserialize Binary Tree
300	Longest Increasing Subsequence
322	Coin Change
417	Pacific Atlantic Water Flow
424	Longest Repeating Character Replacement
435	Non-overlapping Intervals
438	Find All Anagrams in a String
525	Contiguous Array
572	Subtree of Another Tree
647	Palindromic Substrings
697	Degree of an Array
981	Time Based Key-Value Store
994	Rotting Oranges
1391	Check if There is a Valid Path in a Grid
2043	Simple Bank System
2270	Number of Ways to Split Array

Database

Completed 36 out of 97 (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 With at Least 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