Leetcode

Leetcode problems & solutions

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LeetCode

LeetCode Algorithms

(Notes: "♥" means you need buy a book from Leetcode)

# Title Solution Difficulty
226 Invert Binary Tree JavaScript Easy
225 Implement Stack using Queues JavaScript Medium
219 Contains Duplicate II JavaScript Easy
217 Contains Duplicate JavaScript Easy
206 Reverse Linked List JavaScript Easy
205 Isomorphic Strings JavaScript Easy
203 Remove Linked List Elements JavaScript Easy
202 Happy Number JavaScript Easy
191 Number of 1 Bits JavaScript Easy
190 Reverse Bits JavaScript Easy
171 Excel Sheet Column Number JavaScript Easy
170 Two Sum III - Data structure design ♥ Easy
169 Majority Element JavaScript Easy
168 Excel Sheet Column Title JavaScript Easy
151 Reverse Words in a String JavaScript Medium
136 Single Number JavaScript Medium
102 Binary Tree Level Order Traversal JavaScript Easy
88 Merge Sorted Array JavaScript Easy
66 Plus One JavaScript Easy
58 Length of Last Word JavaScript Easy
24 Swap Nodes in Pairs Medium
23 Merge k Sorted Lists JavaScript Hard
22 Generate Parentheses JavaScript Medium
21 Merge Two Sorted Lists JavaScript Easy
20 Valid Parentheses JavaScript Easy
19 Remove Nth Node From End of List JavaScript Easy
18 4Sum Medium
17 Letter Combinations of a Phone Number JavaScript Medium
16 3Sum Closest Medium
15 3Sum Medium
14 Longest Common Prefix JavaScript Easy
13 Roman to Integer JavaScript Easy
12 Integer to Roman JavaScript Medium
11 Container With Most Water JavaScript Medium
10 Regular Expression Matching JavaScript Hard
9 Palindrome Number JavaScript Easy
8 String to Integer (atoi) JavaScript Easy
7 Reverse Integer JavaScript Easy
6 ZigZag Conversion JavaScript Easy
5 Longest Palindromic Substring JavaScript Medium
4 Median of Two Sorted Arrays JavaScript Hard
3 Longest Substring Without Repeating Characters JavaScript Medium
2 Add Two Numbers JavaScript Medium
1 Two Sum JavaScript Medium

LeetCode Shell

# Title Solution Difficulty
195 Tenth Line Shell Easy