Leetcode

My Leetcode practice.

Array & String

Easy

• 1. Two Sum
• 9. Palindrome Number
• 13. Roman to Integer
• 14. Longest Common Prefix
• 26. Remove Duplicates from Sorted Array
• 28. Implement strStr()
• 344. Reverse String
• 1929. Concatenation of Array

Medium

• 3. Longest Substring Without Repeating Characters
• 5. Longest Palindromic Substring
• 8. String to Integer (atoi)
• 11. Container With Most Water
• 81. Search in Rotated Sorted Array II
• 287. Find the Duplicate Number

Hard

• 4. Median of Two Sorted Arrays

Linked List

Easy

• 21. Merge Two Sorted Lists

Medium

• 2. Add Two Numbers
• 328. Odd Even Linked List

Hash

Easy

• 359. Logger Rate Limiter
• 706. Design HashMap

Stack & Queue

Easy

• 20. Valid Parentheses

Heap

Greedy

Medium

• 1029. Two City Scheduling

Sort

Easy

• 1365. How Many Numbers Are Smaller Than the Current Number
• 1859. Sorting the Sentence

DFS & BFS

Easy

• 104. Maximum Depth of Binary Tree
• 938. Range Sum of BST

Medium

• 366. Find Leaves of Binary Tree

Binary Search

Dynamic Programming

Easy

• 53. Maximum Subarray
• 70. Climbing Stairs
• 121. Best Time to Buy and Sell Stock
• 338. Counting Bits
• 509. Fibonacci Number
• 1025. Divisor Game
• 1137. N-th Tribonacci Number

Medium

• 122. Best Time to Buy and Sell Stock II
• 322. Coin Change
• 983. Minimum Cost For Tickets

Hard

• 42. Trapping Rain Water

Graph

Tree

Easy

• 94. Binary Tree Inorder Traversal

Medium

• 102. Binary Tree Level Order Traversal

Math

Medium

• 7. Reverse Integer
• 1641. Count Sorted Vowel Strings