Roman to Integer

LC 13 · 40 modes

Merge Sorted Array

LC 88 · 39 modes

Two Sum III - Data structure design

LC 170 · 21 modes

Isomorphic Strings

LC 205 · 38 modes

Shortest Word Distance

LC 243 · 22 modes

Intersection of Two Arrays

LC 349 · 20 modes

Intersection of Two Arrays II

LC 350 · 19 modes

Logger Rate Limiter

LC 359 · 19 modes

Valid Perfect Square

LC 367 · 30 modes

First Unique Character in a String

LC 387 · 23 modes

Fizz Buzz

LC 412 · 22 modes

Can Place Flowers

LC 605 · 39 modes

Design HashMap

LC 706 · 33 modes

Find Smallest Letter Greater Than Target

LC 744 · 23 modes

Rotate String

LC 796 · 20 modes

Two Sum

LC 1 · 270 modes

String to Integer (atoi)

LC 8 · 23 modes

Find First and Last Position of Element in Sorted Array

LC 34 · 31 modes

Permutations II

LC 47 · 30 modes

Pow(x, n)

LC 50 · 33 modes

Sort Colors

LC 75 · 42 modes

Repeated DNA Sequences

LC 187 · 34 modes

Search a 2D Matrix II

LC 240 · 23 modes

Shortest Word Distance II

LC 244 · 22 modes

Shortest Word Distance III

LC 245 · 22 modes

Factor Combinations

LC 254 · 23 modes

Perfect Squares

LC 279 · 28 modes

Nested List Weight Sum

LC 339 · 18 modes

Flatten Nested List Iterator

LC 341 · 23 modes

Design Hit Counter

LC 362 · 23 modes

Nested List Weight Sum II

LC 364 · 20 modes

Find K Pairs with Smallest Sums

LC 373 · 23 modes

Insert Delete GetRandom O(1)

LC 380 · 35 modes

Shuffle an Array

LC 384 · 19 modes

Serialize and Deserialize BST

LC 449 · 18 modes

Sort Characters By Frequency

LC 451 · 20 modes

Can I Win

LC 464 · 23 modes

Find Largest Value in Each Tree Row

LC 515 · 21 modes

Longest Palindromic Subsequence

LC 516 · 25 modes

Random Pick with Weight

LC 528 · 18 modes

Subarray Sum Equals K

LC 560 · 41 modes

Valid Triangle Number

LC 611 · 23 modes

Sum of Square Numbers

LC 633 · 23 modes

Exclusive Time of Functions

LC 636 · 23 modes

Print Binary Tree

LC 655 · 20 modes

Top K Frequent Words

LC 692 · 22 modes

Partition to K Equal Sum Subsets

LC 698 · 27 modes

Accounts Merge

LC 721 · 24 modes

Is Graph Bipartite?

LC 785 · 25 modes

Find And Replace in String

LC 833 · 23 modes

Validate Stack Sequences

LC 946 · 25 modes

Flower Planting With No Adjacent

LC 1042 · 22 modes

Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold

LC 1343 · 29 modes

Top K Frequent Elements

LC 347 · 264 modes

Encode and Decode Strings

LC 271 · 256 modes

Product of Array Except Self

LC 238 · 255 modes

Valid Number

LC 65 · 15 modes

Text Justification

LC 68 · 23 modes

Word Ladder II

LC 126 · 22 modes

Max Points on a Line

LC 149 · 35 modes

Integer to English Words

LC 273 · 23 modes

Serialize and Deserialize N-ary Tree

LC 428 · 17 modes

All O`one Data Structure

LC 432 · 23 modes

LFU Cache

LC 460 · 24 modes

Count Different Palindromic Subsequences

LC 730 · 21 modes

Valid Palindrome

LC 125 · 264 modes

Integer to Roman

LC 12 · 35 modes

Best Time to Buy And Sell Stock

LC 121 · 262 modes

Minimum Window Substring

LC 76 · 256 modes

Valid Parentheses

LC 20 · 267 modes

Min Stack

LC 155 · 252 modes

Evaluate Reverse Polish Notation

LC 150 · 253 modes

Daily Temperatures

LC 739 · 252 modes

Max Stack

LC 716 · 18 modes

Search In Rotated Sorted Array

LC 33 · 256 modes

Time Based Key Value Store

LC 981 · 256 modes

Merge Two Sorted Lists

LC 21 · 251 modes

Linked List Cycle

LC 141 · 247 modes

LRU Cache

LC 146 · 250 modes

Merge K Sorted Lists

LC 23 · 254 modes

Sqrt(x)

LC 69 · 32 modes

Symmetric Tree

LC 101 · 26 modes

Intersection of Two Linked Lists

LC 160 · 28 modes

Closest Binary Search Tree Value

LC 270 · 18 modes

Second Minimum Node In a Binary Tree

LC 671 · 20 modes

Maximum Depth of Binary Tree

LC 104 · 258 modes

Same Tree

LC 100 · 259 modes

Rotate List

LC 61 · 28 modes

Binary Tree Zigzag Level Order Traversal

LC 103 · 26 modes

Path Sum II

LC 113 · 20 modes

Linked List Cycle II

LC 142 · 19 modes

Binary Tree Upside Down

LC 156 · 21 modes

Binary Search Tree Iterator

LC 173 · 26 modes

Lowest Common Ancestor of a Binary Tree

LC 236 · 20 modes

Find Leaves of Binary Tree

LC 366 · 20 modes

Delete Node in a BST

LC 450 · 32 modes

Lowest Common Ancestor of a Binary Search Tree

LC 235 · 254 modes

Binary Tree Level Order Traversal

LC 102 · 259 modes

Validate Binary Search Tree

LC 98 · 258 modes

Kth Smallest Element In a Bst

LC 230 · 258 modes

Closest Binary Search Tree Value II

LC 272 · 17 modes

Vertical Order Traversal of a Binary Tree

LC 987 · 22 modes

Recover a Tree From Preorder Traversal

LC 1028 · 23 modes

Serialize And Deserialize Binary Tree

LC 297 · 253 modes

Kth Largest Element In a Stream

LC 703 · 245 modes

K Closest Points to Origin

LC 973 · 249 modes

Kth Largest Element In An Array

LC 215 · 249 modes

Implement Rand10() Using Rand7()

LC 470 · 16 modes

Combination Sum

LC 39 · 255 modes

Combination Sum II

LC 40 · 253 modes

Permutations

LC 46 · 255 modes

Word Search

LC 79 · 252 modes

Insert Delete GetRandom O(1) - Duplicates allowed

LC 381 · 23 modes

Profitable Schemes

LC 879 · 19 modes

Number of Islands

LC 200 · 261 modes

Paint House

LC 256 · 21 modes

Find the Celebrity

LC 277 · 23 modes

Max Area of Island

LC 695 · 256 modes

Clone Graph

LC 133 · 251 modes

Rotting Oranges

LC 994 · 251 modes

Course Schedule

LC 207 · 250 modes

Graph Valid Tree

LC 261 · 248 modes

Number of Connected Components In An Undirected Graph

LC 323 · 243 modes

Paint House II

LC 265 · 23 modes

Word Ladder

LC 127 · 255 modes

Climbing Stairs

LC 70 · 262 modes

House Robber

LC 198 · 257 modes

Palindromic Substrings

LC 647 · 255 modes

Coin Change

LC 322 · 262 modes

Maximum Product Subarray

LC 152 · 253 modes

Edit Distance

LC 72 · 244 modes

Maximum Subarray

LC 53 · 260 modes

Valid Parenthesis String

LC 678 · 246 modes

Insert Interval

LC 57 · 254 modes

Merge Intervals

LC 56 · 261 modes

Sparse Matrix Multiplication

LC 311 · 22 modes

Spiral Matrix

LC 54 · 250 modes

Pow(x, n)

246 modes

Best Meeting Point

LC 296 · 23 modes