First Unique Character in a String

LC 387 · 16 modes

Design HashMap

LC 706 · 21 modes

Valid Anagram

LC 242 · 255 modes

Two Sum

LC 1 · 263 modes

Group Anagrams

LC 49 · 255 modes

Product of Array Except Self

LC 238 · 248 modes

Remove Duplicates from Sorted Array

LC 26 · 30 modes

Reverse String

LC 344 · 30 modes

3Sum

LC 15 · 257 modes

Trapping Rain Water

LC 42 · 256 modes

Valid Parentheses

LC 20 · 260 modes

Minimum Add to Make Parentheses Valid

LC 921 · 13 modes

Min Stack

LC 155 · 245 modes

Median of Two Sorted Arrays

LC 4 · 250 modes

Convert Binary Number in a Linked List to Integer

LC 1290 · 14 modes

Add Two Numbers

LC 2 · 248 modes

Two Sum IV - Input is a BST

LC 653 · 12 modes

Binary Tree Zigzag Level Order Traversal

LC 103 · 14 modes

Binary Tree Level Order Traversal

LC 102 · 252 modes

Letter Combinations of a Phone Number

LC 17 · 248 modes

Number of Islands

LC 200 · 254 modes

Word Ladder

LC 127 · 248 modes

Longest Palindromic Substring

LC 5 · 251 modes

Merge Intervals

LC 56 · 254 modes

Transpose Matrix

LC 867 · 13 modes

Missing Number

LC 268 · 244 modes