| 1 |
Two Sum |
C# |
Easy |
| 2 |
Add Two Numbers |
C# |
Medium |
| 3 |
Longest Substring Without Repeating Characters |
C# |
Medium |
| 4 |
Median of Two Sorted Arrays |
C# |
Hard |
| 4 |
Median of Two Sorted Arrays |
Java |
Hard |
| 5 |
Longest Palindromic Substring |
C# |
Medium |
| 6 |
Zigzag Conversion |
C# |
Medium |
| 7 |
Reverse Integer |
C# |
Medium |
| 8 |
String to Integer (atoi) |
C# |
Medium |
| 9 |
Palindrome Number |
C# |
Easy |
| 10 |
Regular Expression Matching |
C# |
Hard |
| 11 |
Container With Most Water |
C# |
Medium |
| 12 |
Integer to Roman |
C# |
Medium |
| 13 |
Roman to Integer |
C# |
Easy |
| 14 |
Longest Common Prefix |
C# |
Easy |
| 15 |
3Sum |
C# |
Medium |
| 16 |
3Sum Closest |
C# |
Medium |
| 17 |
Letter Combinations of a Phone Number |
C# |
Medium |
| 18 |
4Sum |
C# |
Medium |
| 19 |
Remove Nth Node From End of List |
C# |
Medium |
| 20 |
Valid Parentheses |
C# |
Easy |
| 21 |
Merge Two Sorted Lists |
C# |
Easy |
| 22 |
Generate Parentheses |
C# |
Medium |
| 23 |
Merge k Sorted Lists |
C# |
Hard |
| 24 |
Swap Nodes in Pairs |
C# |
Medium |
| 25 |
Reverse Nodes in k-Group |
C# |
Hard |
| 26 |
Remove Duplicates from Sorted Array |
C# |
Easy |
| 27 |
Remove Element |
C# |
Easy |
| 28 |
Find the Index of the First Occurrence in a String |
C# |
Easy |
| 29 |
Divide Two Integers |
C# |
Medium |
| 30 |
Substring with Concatenation of All Words |
C# |
Hard |
| 31 |
Next Permutation |
C# |
Medium |
| 32 |
Longest Valid Parentheses |
C# |
Hard |
| 33 |
Search in Rotated Sorted Array |
C# |
Medium |
| 34 |
Find First and Last Position of Element in Sorted Array |
C# |
Medium |
| 35 |
Search Insert Position |
C# |
Easy |
| 36 |
Valid Sudoku |
C# |
Medium |
| 37 |
Sudoku Solver |
C# |
Hard |
| 38 |
Count and Say |
C# |
Easy |
| 39 |
Combination Sum |
C# |
Medium |
| 40 |
Combination Sum II |
C# |
Medium |
| 41 |
First Missing Positive |
C# |
Hard |
| 42 |
Trapping Rain Water |
C# |
Hard |
| 43 |
Multiply Strings |
C# |
Medium |
| 44 |
Wildcard Matching |
C# |
Hard |
| 45 |
Jump Game II |
C# |
Medium |
| 46 |
Permutations |
C# |
Medium |
| 47 |
Permutations II |
C# |
Medium |
| 48 |
Rotate Image |
C# |
Medium |
| 49 |
Group Anagrams |
C# |
Medium |
| 50 |
Pow(x, n) |
C# |
Medium |
| 51 |
N-Queens |
C# |
Hard |
| 52 |
N-Queens II |
C# |
Hard |
| 53 |
Maximum Subarray |
C# |
Easy |
| 54 |
Spiral Matrix |
C# |
Medium |
| 55 |
Jump Game |
C# |
Medium |
| 56 |
Merge Intervals |
C# |
Medium |
| 57 |
Insert Interval |
C# |
Medium |
| 58 |
Length of Last Word |
C# |
Easy |
| 59 |
Spiral Matrix II |
C# |
Medium |
| 60 |
Permutation Sequence |
C# |
Hard |
| 61 |
Rotate List |
C# |
Medium |
| 62 |
Unique Paths |
C# |
Medium |
| 63 |
Unique Paths II |
C# |
Medium |
| 64 |
Minimum Path Sum |
C# |
Medium |
| 65 |
Valid Number |
C# |
Hard |
| 66 |
Plus One |
C# |
Easy |
| 67 |
Add Binary |
C# |
Easy |
| 68 |
Text Justification |
C# |
Hard |
| 69 |
Sqrt(x) |
C# |
Easy |
| 70 |
Climbing Stairs |
Java |
Easy |
| 71 |
Simplify Path |
C# |
Medium |
| 72 |
Edit Distance |
C# |
Medium |
| 73 |
Set Matrix Zeroes |
C# |
Medium |
| 74 |
Search a 2D Matrix |
C# |
Medium |
| 75 |
Sort Colors |
C# |
Medium |
| 76 |
Minimum Window Substring |
C# |
Hard |
| 77 |
Combinations |
C# |
Medium |
| 78 |
Subsets |
C# |
Medium |
| 79 |
Word Search |
C# |
Medium |
| 80 |
Remove Duplicates from Sorted Array II |
C# |
Medium |
| 81 |
Search in Rotated Sorted Array II |
C# |
Medium |
| 82 |
Remove Duplicates from Sorted List II |
C# |
Medium |
| 83 |
Remove Duplicates from Sorted List |
Java |
Easy |
| 84 |
Largest Rectangle in Histogram |
C# |
Hard |
| 85 |
Maximal Rectangle |
C# |
Hard |
| 86 |
Partition List |
C# |
Medium |
| 87 |
Scramble String |
C# |
Hard |
| 88 |
Merge Sorted Array |
Java |
Easy |
| 88 |
Merge Sorted Array |
C# |
Easy |
| 89 |
Gray Code |
C# |
Medium |
| 90 |
Subsets II |
C# |
Medium |
| 91 |
Decode Ways |
C# |
Medium |
| 92 |
Reverse Linked List II |
C# |
Medium |
| 93 |
Restore IP Addresses |
C# |
Medium |
| 94 |
Binary Tree Inorder Traversal |
Java |
Easy |
| 95 |
Unique Binary Search Trees II |
C# |
Medium |
| 96 |
Unique Binary Search Trees |
C# |
Medium |
| 97 |
Interleaving String |
C# |
Medium |
| 98 |
Validate Binary Search Tree |
C# |
Medium |
| 99 |
Recover Binary Search Tree |
C# |
Medium |
| 100 |
Same Tree |
Java |
Easy |
| 101 |
Symmetric Tree |
Java |
Easy |
| 102 |
Binary Tree Level Order Traversal |
C# |
Medium |
| 103 |
Binary Tree Zigzag Level Order Traversal |
C# |
Medium |
| 104 |
Maximum Depth of Binary Tree |
Java |
Easy |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal |
C# |
Medium |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
C# |
Medium |
| 107 |
Binary Tree Level Order Traversal II |
C# |
Medium |
| 108 |
Convert Sorted Array to Binary Search Tree |
Java |
Easy |
| 109 |
Convert Sorted List to Binary Search Tree |
C# |
Medium |
| 110 |
Balanced Binary Tree |
C# |
Easy |
| 111 |
Minimum Depth of Binary Tree |
C# |
Easy |
| 112 |
Path Sum |
C# |
Easy |
| 113 |
Path Sum II |
C# |
Medium |
| 114 |
Flatten Binary Tree to Linked List |
C# |
Medium |
| 115 |
Distinct Subsequences |
C# |
Hard |
| 116 |
Populating Next Right Pointers in Each Node |
C# |
Medium |
| 117 |
Populating Next Right Pointers in Each Node II |
C# |
Medium |
| 118 |
Pascal's Triangle |
C# |
Easy |
| 119 |
Pascal's Triangle II |
C# |
Easy |
| 120 |
Triangle |
C# |
Medium |
| 121 |
Best Time to Buy and Sell Stock |
C# |
Easy |
| 122 |
Best Time to Buy and Sell Stock II |
C# |
Medium |
| 123 |
Best Time to Buy and Sell Stock III |
C# |
Hard |
| 125 |
Valid Palindrome |
C# |
Easy |
| 127 |
Word Ladder |
C# |
Hard |
| 128 |
Longest Consecutive Sequence |
C# |
Medium |
| 129 |
Sum Root to Leaf Numbers |
C# |
Medium |
| 130 |
Surrounded Regions |
C# |
Medium |
| 131 |
Palindrome Partitioning |
C# |
Medium |
| 132 |
Palindrome Partitioning II |
C# |
Hard |
| 133 |
Clone Graph |
C# |
Medium |
| 134 |
Gas Station |
C# |
Medium |
| 135 |
Candy |
C# |
Hard |
| 136 |
Single Number |
C# |
Easy |
| 137 |
Single Number II |
C# |
Medium |
| 138 |
Copy List with Random Pointer |
C# |
Medium |
| 139 |
Word Break |
C# |
Medium |
| 140 |
Word Break II |
C# |
Hard |
| 141 |
Linked List Cycle |
C# |
Easy |
| 142 |
Linked List Cycle II |
C# |
Medium |
| 143 |
Reorder List |
C# |
Medium |
| 144 |
Binary Tree Preorder Traversal |
C# |
Easy |
| 145 |
Binary Tree Postorder Traversal |
C# |
Easy |
| 146 |
LRU Cache |
C# |
Medium |
| 147 |
Insertion Sort List |
C# |
Medium |
| 148 |
Sort List |
C# |
Medium |
| 149 |
Max Points on a Line |
C# |
Hard |
| 150 |
Evaluate Reverse Polish Notation |
C# |
Medium |
| 151 |
Reverse Words in a String |
C# |
Medium |
| 152 |
Maximum Product Subarray |
C# |
Medium |
| 153 |
Find Minimum in Rotated Sorted Array |
C# |
Medium |
| 154 |
Find Minimum in Rotated Sorted Array II |
C# |
Hard |
| 155 |
Min Stack |
C# |
Medium |
| 160 |
Intersection of Two Linked Lists |
C# |
Easy |
| 162 |
Find Peak Element |
C# |
Medium |
| 164 |
Maximum Gap |
C# |
Medium |
| 165 |
Compare Version Numbers |
C# |
Medium |
| 166 |
Fraction to Recurring Decimal |
C# |
Medium |
| 167 |
Two Sum II - Input Array Is Sorted |
C# |
Medium |
| 168 |
Excel Sheet Column Title |
C# |
Easy |
| 169 |
Majority Element |
C# |
Easy |
| 171 |
Excel Sheet Column Number |
C# |
Easy |
| 172 |
Factorial Trailing Zeroes |
C# |
Medium |
| 173 |
Binary Search Tree Iterator |
C# |
Medium |
| 174 |
Dungeon Game |
C# |
Hard |
| 175 |
Combine Two Tables |
SQL |
Easy |
| 176 |
Second Highest Salary |
SQL |
Medium |
| 177 |
Nth Highest Salary |
SQL |
Medium |
| 178 |
Rank Scores |
SQL |
Medium |
| 179 |
Largest Number |
C# |
Medium |
| 181 |
Employees Earning More Than Their Managers |
SQL |
Easy |
| 187 |
Repeated DNA Sequences |
C# |
Medium |
| 188 |
Best Time to Buy and Sell Stock IV |
C# |
Hard |
| 189 |
Rotate Array |
C# |
Medium |
| 190 |
Reverse Bits |
C# |
Easy |
| 191 |
Number of 1 Bits |
C# |
Easy |
| 192 |
Word Frequency |
Shell |
Medium |
| 193 |
Valid Phone Numbers |
Shell |
Easy |
| 194 |
Transpose File |
Shell |
Medium |
| 195 |
Tenth Line |
Shell |
Easy |
| 196 |
Delete Duplicate Emails |
SQL |
Easy |
| 197 |
Rising Temperature |
SQL |
Easy |
| 198 |
House Robber |
C# |
Medium |
| 199 |
Binary Tree Right Side View |
C# |
Medium |
| 200 |
Number of Islands |
C# |
Medium |
| 201 |
Bitwise AND of Numbers Range |
C# |
Medium |
| 202 |
Happy Number |
C# |
Easy |
| 203 |
Remove Linked List Elements |
C# |
Easy |
| 204 |
Count Primes |
C# |
Easy |
| 205 |
Isomorphic Strings |
C# |
Easy |
| 206 |
Reverse Linked List |
C# |
Easy |
| 207 |
Course Schedule |
C# |
Medium |
| 208 |
Implement Trie (Prefix Tree) |
C# |
Medium |
| 209 |
Minimum Size Subarray Sum |
C# |
Medium |
| 210 |
Course Schedule II |
C# |
Medium |
| 211 |
Design Add and Search Words Data Structure |
C# |
Medium |
| 212 |
Word Search II |
C# |
Hard |
| 213 |
House Robber II |
C# |
Medium |
| 214 |
Shortest Palindrome |
C# |
Hard |
| 215 |
Kth Largest Element in an Array |
C# |
Medium |
| 216 |
Combination Sum III |
C# |
Medium |
| 217 |
Contains Duplicate |
C# |
Easy |
| 218 |
The Skyline Problem |
C# |
Hard |
| 219 |
Contains Duplicate II |
C# |
Medium |
| 220 |
Contains Duplicate III |
C# |
Hard |
| 221 |
Maximal Square |
C# |
Medium |
| 222 |
Count Complete Tree Nodes |
C# |
Medium |
| 223 |
Rectangle Area |
C# |
Medium |
| 224 |
Basic Calculator |
C# |
Hard |
| 225 |
Implement Stack using Queues |
C# |
Easy |
| 226 |
Invert Binary Tree |
C# |
Easy |
| 227 |
Basic Calculator II |
C# |
Medium |
| 228 |
Summary Ranges |
C# |
Easy |
| 229 |
Majority Element II |
C# |
Medium |
| 230 |
Kth Smallest Element in a BST |
C# |
Medium |
| 231 |
Power of Two |
C# |
Easy |
| 232 |
Implement Queue using Stacks |
C# |
Easy |
| 233 |
Number of Digit One |
C# |
Hard |
| 234 |
Palindrome Linked List |
C# |
Easy |
| 235 |
Lowest Common Ancestor of a Binary Search Tree |
C# |
Easy |
| 236 |
Lowest Common Ancestor of a Binary Tree |
C# |
Medium |
| 237 |
Delete Node in a Linked List |
C# |
Easy |
| 238 |
Product of Array Except Self |
C# |
Medium |
| 239 |
Sliding Window Maximum |
C# |
Hard |
| 240 |
Search a 2D Matrix II |
C# |
Medium |
| 241 |
Different Ways to Add Parentheses |
C# |
Medium |
| 242 |
Valid Anagram |
C# |
Easy |
| 257 |
Binary Tree Paths |
C# |
Easy |
| 258 |
Add Digits |
C# |
Easy |
| 260 |
Single Number III |
C# |
Medium |
| 263 |
Ugly Number |
C# |
Easy |
| 264 |
Ugly Number II |
C# |
Medium |
| 268 |
Missing Number |
C# |
Easy |
| 273 |
Integer to English Words |
C# |
Hard |
| 274 |
H-Index |
C# |
Medium |
| 275 |
H-Index II |
C# |
Medium |
| 278 |
First Bad Version |
C# |
Easy |
| 279 |
Perfect Squares |
C# |
Medium |
| 282 |
Expression Add Operators |
C# |
Hard |
| 283 |
Move Zeroes |
C# |
Easy |
| 284 |
Peeking Iterator |
C# |
Medium |
| 287 |
Find the Duplicate Number |
C# |
Medium |
| 289 |
Game of Life |
C# |
Medium |
| 290 |
Word Pattern |
C# |
Easy |
| 292 |
Nim Game |
C# |
Easy |
| 295 |
Find Median from Data Stream |
C# |
Hard |
| 297 |
Serialize and Deserialize Binary Tree |
C# |
Hard |
| 299 |
Bulls and Cows |
C# |
Medium |
| 300 |
Longest Increasing Subsequence |
C# |
Medium |
| 301 |
Remove Invalid Parentheses |
C# |
Hard |
| 303 |
Range Sum Query - Immutable |
C# |
Easy |
| 304 |
Range Sum Query 2D - Immutable |
C# |
Medium |
| 306 |
Additive Number |
C# |
Medium |
| 307 |
Range Sum Query - Mutable |
C# |
Medium |
| 308 |
Range Sum Query 2D - Mutable |
C# |
Hard |
| 309 |
Best Time to Buy and Sell Stock with Cooldown |
C# |
Medium |
| 310 |
Minimum Height Trees |
C# |
Medium |
| 312 |
Burst Balloons |
C# |
Hard |
| 315 |
Count of Smaller Numbers After Self |
C# |
Hard |
| 316 |
Remove Duplicate Letters |
C# |
Medium |
| 318 |
Maximum Product of Word Lengths |
C# |
Medium |
| 319 |
Bulb Switcher |
C# |
Medium |
| 321 |
Create Maximum Number |
C# |
Hard |
| 322 |
Coin Change |
C# |
Medium |
| 324 |
Wiggle Sort II |
C# |
Medium |
| 327 |
Count of Range Sum |
C# |
Hard |
| 328 |
Odd Even Linked List |
C# |
Medium |
| 329 |
Longest Increasing Path in a Matrix |
C# |
Hard |
| 330 |
Patching Array |
C# |
Hard |
| 331 |
Verify Preorder Serialization of a Binary Tree |
C# |
Medium |
| 332 |
Reconstruct Itinerary |
C# |
Medium |
| 334 |
Increasing Triplet Subsequence |
C# |
Medium |
| 335 |
Self Crossing |
C# |
Hard |
| 337 |
House Robber III |
C# |
Medium |
| 338 |
Counting Bits |
C# |
Medium |
| 341 |
Flatten Nested List Iterator |
C# |
Medium |
| 342 |
Power of Four |
C# |
Easy |
| 343 |
Integer Break |
C# |
Medium |
| 344 |
Reverse String |
C# |
Easy |
| 345 |
Reverse Vowels of a String |
C# |
Easy |
| 347 |
Top K Frequent Elements |
C# |
Medium |
| 349 |
Intersection of Two Arrays |
C# |
Easy |
| 350 |
Intersection of Two Arrays II |
C# |
Easy |
| 352 |
Data Stream as Disjoint Intervals |
C# |
Hard |
| 355 |
Design Twitter |
C# |
Medium |
| 357 |
Count Numbers with Unique Digits |
C# |
Medium |
| 365 |
Water and Jug Problem |
C# |
Medium |
| 367 |
Valid Perfect Square |
C# |
Easy |
| 368 |
Largest Divisible Subset |
C# |
Medium |
| 371 |
Sum of Two Integers |
C# |
Easy |
| 372 |
Super Pow |
C# |
Medium |
| 373 |
Find K Pairs with Smallest Sums |
C# |
Medium |
| 374 |
Guess Number Higher or Lower |
C# |
Easy |
| 375 |
Guess Number Higher or Lower II |
C# |
Medium |
| 376 |
Wiggle Subsequence |
C# |
Medium |
| 377 |
Combination Sum IV |
C# |
Medium |
| 378 |
Kth Smallest Element in a Sorted Matrix |
C# |
Medium |
| 380 |
Insert Delete GetRandom O(1) |
C# |
Medium |
| 381 |
Insert Delete GetRandom O(1) - Duplicates allowed |
C# |
Hard |
| 382 |
Linked List Random Node |
C# |
Medium |
| 383 |
Ransom Note |
C# |
Easy |
| 384 |
Shuffle an Array |
C# |
Medium |
| 385 |
Mini Parser |
C# |
Medium |
| 386 |
Lexicographical Numbers |
C# |
Medium |
| 387 |
First Unique Character in a String |
C# |
Easy |
| 388 |
Longest Absolute File Path |
C# |
Medium |
| 389 |
Find the Difference |
C# |
Easy |
| 390 |
Elimination Game |
C# |
Medium |
| 391 |
Perfect Rectangle |
C# |
Hard |
| 392 |
Is Subsequence |
C# |
Easy |
| 393 |
UTF-8 Validation |
C# |
Medium |
| 394 |
Decode String |
C# |
Medium |
| 395 |
Longest Substring with At Least K Repeating Characters |
C# |
Medium |
| 396 |
Rotate Function |
C# |
Medium |
| 397 |
Integer Replacement |
C# |
Medium |
| 398 |
Random Pick Index |
C# |
Medium |
| 399 |
Evaluate Division |
C# |
Medium |
| 400 |
Nth Digit |
C# |
Easy |
| 401 |
Binary Watch |
C# |
Easy |
| 402 |
Remove K Digits |
C# |
Medium |
| 403 |
Frog Jump |
C# |
Hard |
| 404 |
Sum of Left Leaves |
C# |
Easy |
| 405 |
Convert a Number to Hexadecimal |
C# |
Easy |
| 406 |
Queue Reconstruction by Height |
C# |
Medium |
| 407 |
Trapping Rain Water II |
C# |
Hard |
| 409 |
Longest Palindrome |
C# |
Easy |
| 410 |
Split Array Largest Sum |
C# |
Hard |
| 412 |
Fizz Buzz |
C# |
Easy |
| 413 |
Arithmetic Slices |
C# |
Medium |
| 414 |
Third Maximum Number |
C# |
Easy |
| 415 |
Add Strings |
C# |
Easy |
| 416 |
Partition Equal Subset Sum |
C# |
Medium |
| 417 |
Pacific Atlantic Water Flow |
C# |
Medium |
| 419 |
Battleships in a Board |
C# |
Medium |
| 420 |
Strong Password Checker |
C# |
Hard |
| 421 |
Maximum XOR of Two Numbers in an Array |
C# |
Medium |
| 423 |
Reconstruct Original Digits from English |
C# |
Medium |
| 424 |
Longest Repeating Character Replacement |
C# |
Medium |
| 427 |
Construct Quad Tree |
C# |
Medium |
| 429 |
N-ary Tree Level Order Traversal |
C# |
Medium |
| 430 |
Flatten a Multilevel Doubly Linked List |
C# |
Medium |
| 432 |
All O`one Data Structure |
C# |
Hard |
| 433 |
Minimum Genetic Mutation |
C# |
Medium |
| 434 |
Number of Segments in a String |
C# |
Easy |
| 435 |
Non-overlapping Intervals |
C# |
Medium |
| 436 |
Find Right Interval |
C# |
Medium |
| 437 |
Path Sum III |
C# |
Easy |
| 438 |
Find All Anagrams in a String |
C# |
Medium |
| 440 |
K-th Smallest in Lexicographical Order |
C# |
Hard |
| 441 |
Arranging Coins |
C# |
Easy |
| 442 |
Find All Duplicates in an Array |
C# |
Medium |
| 443 |
String Compression |
C# |
Easy |
| 445 |
Add Two Numbers II |
C# |
Medium |
| 446 |
Arithmetic Slices II - Subsequence |
C# |
Hard |
| 447 |
Number of Boomerangs |
C# |
Easy |
| 448 |
Find All Numbers Disappeared in an Array |
C# |
Easy |
| 449 |
Serialize and Deserialize BST |
C# |
Medium |
| 450 |
Delete Node in a BST |
C# |
Medium |
| 451 |
Sort Characters By Frequency |
C# |
Medium |
| 452 |
Minimum Number of Arrows to Burst Balloons |
C# |
Medium |
| 453 |
Minimum Moves to Equal Array Elements |
C# |
Medium |
| 454 |
4Sum II |
C# |
Medium |
| 455 |
Assign Cookies |
C# |
Easy |
| 456 |
132 Pattern |
C# |
Medium |
| 458 |
Poor Pigs |
C# |
Hard |
| 459 |
Repeated Substring Pattern |
C# |
Easy |
| 460 |
LFU Cache |
C# |
Hard |
| 461 |
Hamming Distance |
C# |
Easy |
| 462 |
Minimum Moves to Equal Array Elements II |
C# |
Medium |
| 463 |
Island Perimeter |
C# |
Easy |
| 464 |
Can I Win |
C# |
Medium |
| 466 |
Count The Repetitions |
C# |
Hard |
| 467 |
Unique Substrings in Wraparound String |
C# |
Medium |
| 468 |
Validate IP Address |
C# |
Medium |
| 470 |
Implement Rand10() Using Rand7() |
C# |
Medium |
| 472 |
Concatenated Words |
C# |
Hard |
| 473 |
Matchsticks to Square |
C# |
Medium |
| 474 |
Ones and Zeroes |
C# |
Medium |
| 475 |
Heaters |
C# |
Medium |
| 476 |
Number Complement |
C# |
Easy |
| 477 |
Total Hamming Distance |
C# |
Medium |
| 478 |
Generate Random Point in a Circle |
C# |
Medium |
| 481 |
Magical String |
C# |
Medium |
| 482 |
License Key Formatting |
C# |
Easy |
| 483 |
Smallest Good Base |
C# |
Hard |
| 485 |
Max Consecutive Ones |
C# |
Easy |
| 486 |
Predict the Winner |
C# |
Medium |
| 491 |
Increasing Subsequences |
C# |
Medium |
| 492 |
Construct the Rectangle |
C# |
Easy |
| 493 |
Reverse Pairs |
C# |
Hard |
| 494 |
Target Sum |
C# |
Medium |
| 495 |
Teemo Attacking |
C# |
Medium |
| 496 |
Next Greater Element I |
C# |
Easy |
| 497 |
Random Point in Non-overlapping Rectangles |
C# |
Medium |
| 498 |
Diagonal Traverse |
C# |
Medium |
| 500 |
Keyboard Row |
C# |
Easy |
| 501 |
Find Mode in Binary Search Tree |
C# |
Easy |
| 502 |
IPO |
C# |
Hard |
| 503 |
Next Greater Element II |
C# |
Medium |
| 504 |
Base 7 |
C# |
Easy |
| 506 |
Relative Ranks |
C# |
Easy |
| 507 |
Perfect Number |
C# |
Easy |
| 508 |
Most Frequent Subtree Sum |
C# |
Medium |
| 509 |
Fibonacci Number |
C# |
Easy |
| 511 |
Game Play Analysis I |
SQL |
Easy |
| 513 |
Find Bottom Left Tree Value |
C# |
Medium |
| 514 |
Freedom Trail |
C# |
Hard |
| 515 |
Find Largest Value in Each Tree Row |
C# |
Medium |
| 516 |
Longest Palindromic Subsequence |
C# |
Medium |
| 517 |
Super Washing Machines |
C# |
Hard |
| 518 |
Coin Change 2 |
C# |
Medium |
| 519 |
Random Flip Matrix |
C# |
Medium |
| 520 |
Detect Capital |
C# |
Easy |
| 521 |
Longest Uncommon Subsequence I |
C# |
Easy |
| 522 |
Longest Uncommon Subsequence II |
C# |
Medium |
| 523 |
Continuous Subarray Sum |
C# |
Medium |
| 524 |
Longest Word in Dictionary through Deleting |
C# |
Medium |
| 525 |
Contiguous Array |
C# |
Medium |
| 526 |
Beautiful Arrangement |
C# |
Medium |
| 528 |
Random Pick with Weight |
C# |
Medium |
| 529 |
Minesweeper |
C# |
Medium |
| 530 |
Minimum Absolute Difference in BST |
C# |
Easy |
| 532 |
K-diff Pairs in an Array |
C# |
Medium |
| 535 |
Encode and Decode TinyURL |
C# |
Medium |
| 537 |
Complex Number Multiplication |
C# |
Medium |
| 538 |
Convert BST to Greater Tree |
C# |
Easy |
| 539 |
Minimum Time Difference |
C# |
Medium |
| 540 |
Single Element in a Sorted Array |
C# |
Medium |
| 541 |
Reverse String II |
C# |
Easy |
| 542 |
01 Matrix |
C# |
Medium |
| 543 |
Diameter of Binary Tree |
C# |
Easy |
| 546 |
Remove Boxes |
C# |
Hard |
| 547 |
Number of Provinces |
C# |
Medium |
| 550 |
Game Play Analysis IV |
SQL |
Easy |
| 551 |
Student Attendance Record I |
C# |
Easy |
| 552 |
Student Attendance Record II |
C# |
Hard |
| 553 |
Optimal Division |
C# |
Medium |
| 554 |
Brick Wall |
C# |
Medium |
| 556 |
Next Greater Element III |
C# |
Medium |
| 557 |
Reverse Words in a String III |
C# |
Easy |
| 558 |
Logical OR of Two Binary Grids Represented as Quad-Trees |
C# |
Medium |
| 559 |
Maximum Depth of N-ary Tree |
C# |
Easy |
| 560 |
Subarray Sum Equals K |
C# |
Medium |
| 561 |
Array Partition I |
C# |
Easy |
| 563 |
Binary Tree Tilt |
C# |
Easy |
| 565 |
Array Nesting |
C# |
Medium |
| 566 |
Reshape the Matrix |
C# |
Easy |
| 567 |
Permutation in String |
C# |
Medium |
| 570 |
Managers with at Least 5 Direct Reports |
SQL |
Medium |
| 572 |
Subtree of Another Tree |
C# |
Easy |
| 575 |
Distribute Candies |
C# |
Easy |
| 576 |
Out of Boundary Paths |
C# |
Medium |
| 577 |
Employee Bonus |
SQL |
Easy |
| 581 |
Shortest Unsorted Continuous Subarray |
C# |
Medium |
| 583 |
Delete Operation for Two Strings |
C# |
Medium |
| 584 |
Find Customer Referee |
SQL |
Easy |
| 585 |
Investments in 2016 |
SQL |
Medium |
| 586 |
Customer Placing the Largest Number of Orders |
SQL |
Easy |
| 587 |
Erect the Fence |
C# |
Hard |
| 589 |
N-ary Tree Preorder Traversal |
C# |
Easy |
| 590 |
N-ary Tree Postorder Traversal |
C# |
Easy |
| 591 |
Tag Validator |
C# |
Hard |
| 592 |
Fraction Addition and Subtraction |
C# |
Medium |
| 593 |
Valid Square |
C# |
Medium |
| 594 |
Longest Harmonious Subsequence |
C# |
Easy |
| 595 |
Big Countries |
SQL |
Easy |
| 596 |
Classes More Than 5 Students |
SQL |
Easy |
| 598 |
Range Addition II |
C# |
Easy |
| 599 |
Minimum Index Sum of Two Lists |
C# |
Easy |
| 600 |
Non-negative Integers without Consecutive Ones |
C# |
Hard |
| 601 |
Human Traffic of Stadium |
SQL |
Hard |
| 602 |
Friend Requests I: Overall Acceptance Rate |
SQL |
Medium |
| 605 |
Can Place Flowers |
C# |
Easy |
| 606 |
Construct String from Binary Tree |
C# |
Easy |
| 607 |
Sales Person |
SQL |
Easy |
| 608 |
Tree Node |
SQL |
Easy |
| 609 |
Find Duplicate File in System |
C# |
Medium |
| 610 |
Triangle Judgement |
SQL |
Easy |
| 611 |
Valid Triangle Number |
C# |
Medium |
| 617 |
Merge Two Binary Trees |
C# |
Easy |
| 619 |
Biggest Single Number |
SQL |
Easy |
| 620 |
Not Boring Movies |
SQL |
Easy |
| 621 |
Task Scheduler |
C# |
Medium |
| 622 |
Design Circular Queue |
C# |
Medium |
| 623 |
Add One Row to Tree |
C# |
Medium |
| 624 |
Maximum Distance in Arrays |
C# |
Medium |
| 626 |
Exchange Seats |
SQL |
Medium |
| 627 |
Swap Salary |
SQL |
Easy |
| 628 |
Maximum Product of Three Numbers |
C# |
Easy |
| 629 |
K Inverse Pairs Array |
C# |
Hard |
| 630 |
Course Schedule III |
C# |
Hard |
| 633 |
Sum of Square Numbers |
C# |
Medium |
| 636 |
Exclusive Time of Functions |
C# |
Medium |
| 637 |
Average of Levels in Binary Tree |
C# |
Easy |
| 638 |
Shopping Offers |
C# |
Medium |
| 639 |
Decode Ways II |
C# |
Hard |
| 640 |
Solve the Equation |
C# |
Medium |
| 641 |
Design Circular Deque |
C# |
Medium |
| 643 |
Maximum Average Subarray I |
C# |
Easy |
| 645 |
Set Mismatch |
C# |
Easy |
| 646 |
Maximum Length of Pair Chain |
C# |
Medium |
| 647 |
Palindromic Substrings |
C# |
Medium |
| 648 |
Replace Words |
C# |
Medium |
| 649 |
Dota2 Senate |
C# |
Medium |
| 650 |
2 Keys Keyboard |
C# |
Medium |
| 652 |
Find Duplicate Subtrees |
C# |
Medium |
| 653 |
Two Sum IV - Input is a BST |
C# |
Easy |
| 654 |
Maximum Binary Tree |
C# |
Medium |
| 655 |
Print Binary Tree |
C# |
Medium |
| 657 |
Robot Return to Origin |
C# |
Easy |
| 658 |
Find K Closest Elements |
C# |
Medium |
| 659 |
Split Array into Consecutive Subsequences |
C# |
Medium |
| 661 |
Image Smoother |
C# |
Easy |
| 662 |
Maximum Width of Binary Tree |
C# |
Medium |
| 664 |
Strange Printer |
C# |
Hard |
| 665 |
Non-decreasing Array |
C# |
Easy |
| 667 |
Beautiful Arrangement II |
C# |
Medium |
| 668 |
Kth Smallest Number in Multiplication Table |
C# |
Hard |
| 669 |
Trim a Binary Search Tree |
C# |
Medium |
| 670 |
Maximum Swap |
C# |
Medium |
| 671 |
Second Minimum Node In a Binary Tree |
C# |
Easy |
| 672 |
Bulb Switcher II |
C# |
Medium |
| 673 |
Number of Longest Increasing Subsequence |
C# |
Medium |
| 674 |
Longest Continuous Increasing Subsequence |
C# |
Easy |
| 675 |
Cut Off Trees for Golf Event |
C# |
Hard |
| 676 |
Implement Magic Dictionary |
C# |
Medium |
| 677 |
Map Sum Pairs |
C# |
Medium |
| 678 |
Valid Parenthesis String |
C# |
Medium |
| 679 |
24 Game |
C# |
Hard |
| 680 |
Valid Palindrome II |
C# |
Easy |
| 682 |
Baseball Game |
C# |
Easy |
| 684 |
Redundant Connection |
C# |
Medium |
| 685 |
Redundant Connection II |
C# |
Hard |
| 686 |
Repeated String Match |
C# |
Easy |
| 687 |
Longest Univalue Path |
C# |
Easy |
| 688 |
Knight Probability in Chessboard |
C# |
Medium |
| 689 |
Maximum Sum of 3 Non-Overlapping Subarrays |
C# |
Hard |
| 690 |
Employee Importance |
C# |
Easy |
| 691 |
Stickers to Spell Word |
C# |
Hard |
| 692 |
Top K Frequent Words |
C# |
Medium |
| 693 |
Binary Number with Alternating Bits |
C# |
Easy |
| 695 |
Max Area of Island |
C# |
Medium |
| 696 |
Count Binary Substrings |
C# |
Easy |
| 697 |
Degree of an Array |
C# |
Easy |
| 698 |
Partition to K Equal Sum Subsets |
C# |
Medium |
| 699 |
Falling Squares |
C# |
Hard |
| 700 |
Search in a Binary Search Tree |
C# |
Easy |
| 701 |
Insert into a Binary Search Tree |
C# |
Medium |
| 703 |
Kth Largest Element in a Stream |
C# |
Easy |
| 704 |
Binary Search |
C# |
Easy |
| 705 |
Design HashSet |
C# |
Easy |
| 706 |
Design HashMap |
C# |
Easy |
| 707 |
Design Linked List |
C# |
Medium |
| 709 |
To Lower Case |
C# |
Easy |
| 710 |
Random Pick with Blacklist |
C# |
Hard |
| 712 |
Minimum ASCII Delete Sum for Two Strings |
C# |
Medium |
| 713 |
Subarray Product Less Than K |
C# |
Medium |
| 714 |
Best Time to Buy and Sell Stock with Transaction Fee |
C# |
Medium |
| 717 |
1-bit and 2-bit Characters |
C# |
Easy |
| 718 |
Maximum Length of Repeated Subarray |
C# |
Medium |
| 719 |
Find K-th Smallest Pair Distance |
C# |
Hard |
| 720 |
Longest Word in Dictionary |
C# |
Easy |
| 722 |
Remove Comments |
C# |
Medium |
| 724 |
Find Pivot Index |
C# |
Easy |
| 725 |
Split Linked List in Parts |
C# |
Medium |
| 728 |
Self Dividing Numbers |
C# |
Easy |
| 729 |
My Calendar I |
C# |
Medium |
| 731 |
My Calendar II |
C# |
Medium |
| 732 |
My Calendar III |
C# |
Hard |
| 733 |
Flood Fill |
C# |
Easy |
| 735 |
Asteroid Collision |
C# |
Medium |
| 736 |
Parse Lisp Expression |
C# |
Hard |
| 738 |
Monotone Increasing Digits |
C# |
Medium |
| 739 |
Daily Temperatures |
C# |
Medium |
| 740 |
Delete and Earn |
C# |
Medium |
| 741 |
Cherry Pickup |
C# |
Hard |
| 743 |
Network Delay Time |
C# |
Medium |
| 744 |
Find Smallest Letter Greater Than Target |
C# |
Easy |
| 746 |
Min Cost Climbing Stairs |
C# |
Easy |
| 747 |
Largest Number At Least Twice of Others |
C# |
Easy |
| 748 |
Shortest Completing Word |
C# |
Easy |
| 749 |
Contain Virus |
C# |
Hard |
| 752 |
Open the Lock |
C# |
Medium |
| 753 |
Cracking the Safe |
C# |
Hard |
| 754 |
Reach a Number |
C# |
Medium |
| 756 |
Pyramid Transition Matrix |
C# |
Medium |
| 761 |
Special Binary String |
C# |
Hard |
| 762 |
Prime Number of Set Bits in Binary Representation |
C# |
Easy |
| 763 |
Partition Labels |
C# |
Medium |
| 764 |
Largest Plus Sign |
C# |
Medium |
| 765 |
Couples Holding Hands |
C# |
Hard |
| 766 |
Toeplitz Matrix |
C# |
Easy |
| 767 |
Reorganize String |
C# |
Medium |
| 768 |
Max Chunks To Make Sorted II |
C# |
Hard |
| 769 |
Max Chunks To Make Sorted |
C# |
Medium |
| 771 |
Jewels and Stones |
C# |
Easy |
| 773 |
Sliding Puzzle |
C# |
Hard |
| 775 |
Global and Local Inversions |
C# |
Medium |
| 777 |
Swap Adjacent in LR String |
C# |
Medium |
| 778 |
Swim in Rising Water |
C# |
Hard |
| 779 |
K-th Symbol in Grammar |
C# |
Medium |
| 780 |
Reaching Points |
C# |
Hard |
| 781 |
Rabbits in Forest |
C# |
Medium |
| 782 |
Transform to Chessboard |
C# |
Hard |
| 783 |
Minimum Distance Between BST Nodes |
C# |
Easy |
| 785 |
Is Graph Bipartite? |
C# |
Medium |
| 786 |
K-th Smallest Prime Fraction |
C# |
Hard |
| 787 |
Cheapest Flights Within K Stops |
C# |
Medium |
| 788 |
Rotated Digits |
C# |
Easy |
| 789 |
Escape The Ghosts |
C# |
Medium |
| 790 |
Domino and Tromino Tiling |
C# |
Medium |
| 791 |
Custom Sort String |
C# |
Medium |
| 792 |
Number of Matching Subsequences |
C# |
Medium |
| 793 |
Preimage Size of Factorial Zeroes Function |
C# |
Hard |
| 794 |
Valid Tic-Tac-Toe State |
C# |
Medium |
| 795 |
Number of Subarrays with Bounded Maximum |
C# |
Medium |
| 796 |
Rotate String |
C# |
Easy |
| 797 |
All Paths From Source to Target |
C# |
Medium |
| 798 |
Smallest Rotation with Highest Score |
C# |
Hard |
| 799 |
Champagne Tower |
C# |
Medium |
| 801 |
Minimum Swaps To Make Sequences Increasing |
C# |
Hard |
| 802 |
Find Eventual Safe States |
C# |
Medium |
| 804 |
Unique Morse Code Words |
C# |
Easy |
| 805 |
Split Array With Same Average |
C# |
Hard |
| 806 |
Number of Lines To Write String |
C# |
Easy |
| 807 |
Max Increase to Keep City Skyline |
C# |
Medium |
| 808 |
Soup Servings |
C# |
Medium |
| 809 |
Expressive Words |
C# |
Medium |
| 810 |
Chalkboard XOR Game |
C# |
Hard |
| 811 |
Subdomain Visit Count |
C# |
Easy |
| 812 |
Largest Triangle Area |
C# |
Easy |
| 813 |
Largest Sum of Averages |
C# |
Medium |
| 814 |
Binary Tree Pruning |
C# |
Medium |
| 815 |
Bus Routes |
C# |
Hard |
| 816 |
Ambiguous Coordinates |
C# |
Medium |
| 817 |
Linked List Components |
C# |
Medium |
| 818 |
Race Car |
C# |
Hard |
| 819 |
Most Common Word |
C# |
Easy |
| 820 |
Short Encoding of Words |
C# |
Medium |
| 821 |
Shortest Distance to a Character |
C# |
Easy |
| 822 |
Card Flipping Game |
C# |
Medium |
| 823 |
Binary Trees With Factors |
C# |
Medium |
| 824 |
Goat Latin |
C# |
Easy |
| 825 |
Friends Of Appropriate Ages |
C# |
Medium |
| 826 |
Most Profit Assigning Work |
C# |
Medium |
| 827 |
Making A Large Island |
C# |
Hard |
| 828 |
Unique Letter String |
C# |
Hard |
| 829 |
Consecutive Numbers Sum |
C# |
Hard |
| 830 |
Positions of Large Groups |
C# |
Easy |
| 831 |
Masking Personal Information |
C# |
Medium |
| 832 |
Flipping an Image |
C# |
Easy |
| 833 |
Find And Replace in String |
C# |
Medium |
| 834 |
Sum of Distances in Tree |
C# |
Hard |
| 835 |
Image Overlap |
C# |
Medium |
| 836 |
Rectangle Overlap |
C# |
Easy |
| 887 |
Super Egg Drop |
C# |
Hard |
| 837 |
New 21 Game |
C# |
Medium |
| 838 |
Push Dominoes |
C# |
Medium |
| 839 |
Similar String Groups |
C# |
Hard |
| 840 |
Magic Squares In Grid |
C# |
Easy |
| 841 |
Keys and Rooms |
C# |
Medium |
| 842 |
Split Array into Fibonacci Sequence |
C# |
Medium |
| 844 |
Backspace String Compare |
C# |
Easy |
| 845 |
Longest Mountain in Array |
C# |
Medium |
| 846 |
Hand of Straights |
C# |
Medium |
| 847 |
Shortest Path Visiting All Nodes |
C# |
Hard |
| 848 |
Shifting Letters |
C# |
Medium |
| 849 |
Maximize Distance to Closest Person |
C# |
Medium |
| 851 |
Loud and Rich |
C# |
Medium |
| 852 |
Peak Index in a Mountain Array |
C# |
Medium |
| 853 |
Car Fleet |
C# |
Medium |
| 854 |
K-Similar Strings |
C# |
Hard |
| 855 |
Exam Room |
C# |
Medium |
| 856 |
Score of Parentheses |
C# |
Medium |
| 857 |
Minimum Cost to Hire K Workers |
C# |
Hard |
| 858 |
Mirror Reflection |
C# |
Medium |
| 859 |
Buddy Strings |
C# |
Easy |
| 860 |
Lemonade Change |
C# |
Easy |
| 861 |
Score After Flipping Matrix |
C# |
Medium |
| 862 |
Shortest Subarray with Sum at Least K |
C# |
Hard |
| 863 |
All Nodes Distance K in Binary Tree |
C# |
Medium |
| 864 |
Shortest Path to Get All Keys |
C# |
Hard |
| 865 |
Smallest Subtree with all the Deepest Nodes |
C# |
Medium |
| 866 |
Prime Palindrome |
C# |
Medium |
| 867 |
Transpose Matrix |
C# |
Easy |
| 868 |
Binary Gap |
C# |
Easy |
| 869 |
Reordered Power of 2 |
C# |
Medium |
| 870 |
Advantage Shuffle |
C# |
Medium |
| 871 |
Minimum Number of Refueling Stops |
C# |
Hard |
| 872 |
Leaf-Similar Trees |
C# |
Easy |
| 873 |
Length of Longest Fibonacci Subsequence |
C# |
Medium |
| 874 |
Walking Robot Simulation |
C# |
Easy |
| 875 |
Koko Eating Bananas |
C# |
Medium |
| 876 |
Middle of the Linked List |
C# |
Easy |
| 877 |
Stone Game |
C# |
Medium |
| 878 |
Nth Magical Number |
C# |
Hard |
| 879 |
Profitable Schemes |
C# |
Hard |
| 881 |
Boats to Save People |
C# |
Medium |
| 882 |
Reachable Nodes In Subdivided Graph |
C# |
Hard |
| 883 |
Projection Area of 3D Shapes |
C# |
Easy |
| 884 |
Uncommon Words from Two Sentences |
C# |
Easy |
| 885 |
Spiral Matrix III |
C# |
Medium |
| 886 |
Possible Bipartition |
C# |
Medium |
| 887 |
Super Egg Drop |
C# |
Hard |
| 888 |
Fair Candy Swap |
C# |
Easy |
| 889 |
Construct Binary Tree from Preorder and Postorder Traversal |
C# |
Medium |
| 890 |
Find and Replace Pattern |
C# |
Medium |
| 891 |
Sum of Subsequence Widths |
C# |
Hard |
| 892 |
Surface Area of 3D Shapes |
C# |
Easy |
| 893 |
Groups of Special-Equivalent Strings |
C# |
Medium |
| 894 |
All Possible Full Binary Trees |
C# |
Medium |
| 895 |
Maximum Frequency Stack |
C# |
Hard |
| 896 |
Monotonic Array |
C# |
Easy |
| 897 |
Increasing Order Search Tree |
C# |
Easy |
| 898 |
Bitwise ORs of Subarrays |
C# |
Medium |
| 899 |
Orderly Queue |
C# |
Hard |
| 900 |
RLE Iterator |
C# |
Medium |
| 901 |
Online Stock Span |
C# |
Medium |
| 902 |
Numbers At Most N Given Digit Set |
C# |
Hard |
| 903 |
Valid Permutations for DI Sequence |
C# |
Hard |
| 904 |
Fruit Into Baskets |
C# |
Medium |
| 905 |
Sort Array By Parity |
C# |
Easy |
| 906 |
Super Palindromes |
C# |
Hard |
| 907 |
Sum of Subarray Minimums |
C# |
Medium |
| 908 |
Smallest Range I |
C# |
Easy |
| 909 |
Snakes and Ladders |
C# |
Medium |
| 910 |
Smallest Range II |
C# |
Medium |
| 911 |
Online Election |
C# |
Medium |
| 912 |
Sort an Array |
C# |
Medium |
| 914 |
X of a Kind in a Deck of Cards |
C# |
Easy |
| 915 |
Partition Array into Disjoint Intervals |
C# |
Medium |
| 916 |
Word Subsets |
C# |
Medium |
| 917 |
Reverse Only Letters |
C# |
Easy |
| 918 |
Maximum Sum Circular Subarray |
C# |
Medium |
| 919 |
Complete Binary Tree Inserter |
C# |
Medium |
| 920 |
Number of Music Playlists |
C# |
Hard |
| 921 |
Minimum Add to Make Parentheses Valid |
C# |
Medium |
| 922 |
Sort Array By Parity II |
C# |
Easy |
| 923 |
3Sum With Multiplicity |
C# |
Medium |
| 924 |
Minimize Malware Spread |
C# |
Hard |
| 925 |
Long Pressed Name |
C# |
Easy |
| 926 |
Flip String to Monotone Increasing |
C# |
Medium |
| 927 |
Three Equal Parts |
C# |
Hard |
| 929 |
Unique Email Addresses |
C# |
Easy |
| 930 |
Binary Subarrays With Sum |
C# |
Medium |
| 931 |
Minimum Falling Path Sum |
C# |
Medium |
| 932 |
Minimum Add to Make Parentheses Valid |
C# |
Medium |
| 933 |
Number of Recent Calls |
C# |
Easy |
| 934 |
Shortest Bridge |
C# |
Medium |
| 935 |
Knight Dialer |
C# |
Medium |
| 936 |
Stamping The Sequence |
C# |
Hard |
| 937 |
Reorder Data in Log Files |
C# |
Medium |
| 938 |
Range Sum of BST |
C# |
Easy |
| 939 |
Minimum Area Rectangle |
C# |
Medium |
| 940 |
Distinct Subsequences II |
C# |
Hard |
| 941 |
Valid Mountain Array |
C# |
Easy |
| 942 |
DI String Match |
C# |
Easy |
| 943 |
Find the Shortest Superstring |
C# |
Hard |
| 944 |
Delete Columns to Make Sorted |
C# |
Easy |
| 945 |
Minimum Increment to Make Array Unique |
C# |
Medium |
| 946 |
Validate Stack Sequences |
C# |
Medium |
| 947 |
Most Stones Removed with Same Row or Column |
C# |
Medium |
| 948 |
Bag of Tokens |
C# |
Medium |
| 949 |
Largest Time for Given Digits |
C# |
Medium |
| 950 |
Reveal Cards In Increasing Order |
C# |
Medium |
| 951 |
Flip Equivalent Binary Trees |
C# |
Medium |
| 952 |
Largest Component Size by Common Factor |
C# |
Hard |
| 953 |
Verifying an Alien Dictionary |
C# |
Easy |
| 954 |
Array of Doubled Pairs |
C# |
Medium |
| 955 |
Delete Columns to Make Sorted II |
C# |
Medium |
| 956 |
Tallest Billboard |
C# |
Hard |
| 957 |
Prison Cells After N Days |
C# |
Medium |
| 958 |
Check Completeness of a Binary Tree |
C# |
Medium |
| 959 |
Regions Cut By Slashes |
C# |
Medium |
| 960 |
Delete Columns to Make Sorted III |
C# |
Hard |
| 961 |
N-Repeated Element in Size 2N Array |
C# |
Easy |
| 962 |
Maximum Width Ramp |
C# |
Medium |
| 963 |
Minimum Area Rectangle II |
C# |
Medium |
| 965 |
Univalued Binary Tree |
C# |
Easy |
| 966 |
Vowel Spellchecker |
C# |
Medium |
| 967 |
Numbers With Same Consecutive Differences |
C# |
Medium |
| 968 |
Binary Tree Cameras |
C# |
Hard |
| 969 |
Pancake Sorting |
C# |
Medium |
| 970 |
Powerful Integers |
C# |
Medium |
| 971 |
Flip Binary Tree To Match Preorder Traversal |
C# |
Medium |
| 973 |
K Closest Points to Origin |
C# |
Medium |
| 974 |
Subarray Sums Divisible by K |
C# |
Medium |
| 975 |
Odd Even Jump |
C# |
Hard |
| 976 |
Largest Perimeter Triangle |
C# |
Easy |
| 977 |
Squares of a Sorted Array |
C# |
Easy |
| 978 |
Longest Turbulent Subarray |
C# |
Medium |
| 979 |
Distribute Coins in Binary Tree |
C# |
Medium |
| 980 |
Unique Paths III |
C# |
Hard |
| 981 |
Time Based Key-Value Store |
C# |
Medium |
| 982 |
Triples with Bitwise AND Equal To Zero |
C# |
Hard |
| 983 |
Minimum Cost For Tickets |
C# |
Medium |
| 984 |
String Without AAA or BBB |
C# |
Medium |
| 985 |
Sum of Even Numbers After Queries |
C# |
Easy |
| 986 |
Interval List Intersections |
C# |
Medium |
| 987 |
Vertical Order Traversal of a Binary Tree |
C# |
Hard |
| 988 |
Smallest String Starting From Leaf |
C# |
Medium |
| 989 |
Add to Array-Form of Integer |
C# |
Easy |
| 990 |
Satisfiability of Equality Equations |
C# |
Medium |
| 991 |
Broken Calculator |
C# |
Medium |
| 992 |
Subarrays with K Different Integers |
C# |
Hard |
| 993 |
Cousins in Binary Tree |
C# |
Easy |
| 994 |
Rotting Oranges |
C# |
Medium |
| 995 |
Minimum Number of K Consecutive Bit Flips |
C# |
Hard |
| 996 |
Number of Squareful Arrays |
C# |
Hard |
| 997 |
Find the Town Judge |
C# |
Easy |
| 998 |
Maximum Binary Tree II |
C# |
Medium |
| 999 |
Available Captures for Rook |
C# |
Easy |
| 1000 |
Minimum Cost to Merge Stones |
C# |
Hard |
| 1001 |
Grid Illumination |
C# |
Hard |
| 1002 |
Find Common Characters |
C# |
Easy |
| 1003 |
Check If Word Is Valid After Substitutions |
C# |
Medium |
| 1004 |
Max Consecutive Ones III |
C# |
Medium |
| 1005 |
Maximize Sum Of Array After K Negations |
C# |
Easy |
| 1006 |
Clumsy Factorial |
C# |
Medium |
| 1007 |
Minimum Domino Rotations For Equal Row |
C# |
Medium |
| 1008 |
Construct Binary Search Tree from Preorder Traversal |
C# |
Medium |
| 1009 |
Complement of Base 10 Integer |
C# |
Easy |
| 1010 |
Pairs of Songs With Total Durations Divisible by 60 |
C# |
Medium |
| 1011 |
Capacity To Ship Packages Within D Days |
C# |
Medium |
| 1012 |
Numbers With Repeated Digits |
C# |
Hard |
| 1013 |
Partition Array Into Three Parts With Equal Sum |
C# |
Easy |
| 1014 |
Best Sightseeing Pair |
C# |
Medium |
| 1015 |
Smallest Integer Divisible by K |
C# |
Medium |
| 1016 |
Binary String With Substrings Representing 1 To N |
C# |
Medium |
| 1017 |
Convert to Base -2 |
C# |
Medium |
| 1018 |
Binary Prefix Divisible By 5 |
C# |
Easy |
| 1019 |
Next Greater Node In Linked List |
C# |
Medium |
| 1020 |
Number of Enclaves |
C# |
Medium |
| 1021 |
Remove Outermost Parentheses |
C# |
Easy |
| 1022 |
Sum of Root To Leaf Binary Numbers |
C# |
Easy |
| 1023 |
Camelcase Matching |
C# |
Medium |
| 1024 |
Video Stitching |
C# |
Medium |
| 1025 |
Divisor Game |
C# |
Easy |
| 1026 |
Maximum Difference Between Node and Ancestor |
C# |
Medium |
| 1027 |
Longest Arithmetic Sequence |
C# |
Medium |
| 1028 |
Recover a Tree From Preorder Traversal |
C# |
Hard |
| 1029 |
Two City Scheduling |
C# |
Medium |
| 1030 |
Matrix Cells in Distance Order |
C# |
Easy |
| 1031 |
Maximum Sum of Two Non-Overlapping Subarrays |
C# |
Medium |
| 1032 |
Stream of Characters |
C# |
Hard |
| 1033 |
Moving Stones Until Consecutive |
C# |
Easy |
| 1034 |
Coloring A Border |
C# |
Medium |
| 1035 |
Uncrossed Lines |
C# |
Medium |
| 1036 |
Escape a Large Maze |
C# |
Hard |
| 1037 |
Valid Boomerang |
C# |
Easy |
| 1038 |
Binary Search Tree to Greater Sum Tree |
C# |
Medium |
| 1039 |
Minimum Score Triangulation of Polygon |
C# |
Medium |
| 1040 |
Moving Stones Until Consecutive II |
C# |
Medium |
| 1041 |
Robot Bounded In Circle |
C# |
Medium |
| 1042 |
Flower Planting With No Adjacent |
C# |
Medium |
| 1043 |
Partition Array for Maximum Sum |
C# |
Medium |
| 1045 |
Customers Who Bought All Products |
SQL |
Medium |
| 1046 |
Last Stone Weight |
C# |
Easy |
| 1047 |
Remove All Adjacent Duplicates In String |
C# |
Easy |
| 1048 |
Longest String Chain |
C# |
Medium |
| 1049 |
Last Stone Weight II |
C# |
Medium |
| 1050 |
Actors and Directors Who Cooperated At Least Three Times |
SQL |
Medium |
| 1051 |
Height Checker |
C# |
Easy |
| 1052 |
Grumpy Bookstore Owner |
C# |
Medium |
| 1053 |
Previous Permutation With One Swap |
C# |
Medium |
| 1054 |
Distant Barcodes |
C# |
Medium |
| 1061 |
Lexicographically Smallest Equivalent String |
C# |
Medium |
| 1068 |
Product Sales Analysis II |
SQL |
Easy |
| 1070 |
Product Sales Analysis I |
SQL |
Easy |
| 1071 |
Greatest Common Divisor of Strings |
C# |
Easy |
| 1072 |
Flip Columns For Maximum Number of Equal Rows |
C# |
Medium |
| 1073 |
Adding Two Negabinary Numbers |
C# |
Medium |
| 1074 |
Number of Submatrices That Sum to Target |
C# |
Hard |
| 1075 |
Project Employees I |
SQL |
Easy |
| 1078 |
Occurrences After Bigram |
C# |
Easy |
| 1079 |
Letter Tile Possibilities |
C# |
Medium |
| 1080 |
Insufficient Nodes in Root to Leaf Paths |
C# |
Medium |
| 1081 |
Smallest Subsequence of Distinct Characters |
C# |
Medium |
| 1084 |
Sales Analysis III |
SQL |
Easy |
| 1089 |
Duplicate Zeros |
C# |
Easy |
| 1090 |
Largest Values From Labels |
C# |
Medium |
| 1091 |
Shortest Path in Binary Matrix |
C# |
Medium |
| 1092 |
Shortest Common Supersequence |
C# |
Hard |
| 1093 |
Statistics from a Large Sample |
C# |
Medium |
| 1094 |
Car Pooling |
C# |
Medium |
| 1095 |
Find in Mountain Array |
C# |
Hard |
| 1096 |
Brace Expansion II |
C# |
Hard |
| 1103 |
Distribute Candies to People |
C# |
Easy |
| 1104 |
Path In Zigzag Labelled Binary Tree |
C# |
Medium |
| 1105 |
Filling Bookcase Shelves |
C# |
Medium |
| 1106 |
Parsing A Boolean Expression |
C# |
Hard |
| 1108 |
Defanging an IP Address |
C# |
Easy |
| 1109 |
Corporate Flight Bookings |
C# |
Medium |
| 1110 |
Delete Nodes And Return Forest |
C# |
Medium |
| 1111 |
Maximum Nesting Depth of Two Valid Parentheses Strings |
C# |
Medium |
| 1114 |
Print in Order |
C# |
Easy |
| 1115 |
Print FooBar Alternately |
C# |
Medium |
| 1116 |
Print Zero Even Odd |
C# |
Medium |
| 1117 |
Building H2O |
C# |
Medium |
| 1122 |
Relative Sort Array |
C# |
Easy |
| 1123 |
Lowest Common Ancestor of Deepest Leaves |
C# |
Medium |
| 1124 |
Longest Well-Performing Interval |
C# |
Medium |
| 1125 |
Smallest Sufficient Team |
C# |
Hard |
| 1128 |
Number of Equivalent Domino Pairs |
C# |
Easy |
| 1129 |
Shortest Path with Alternating Colors |
C# |
Medium |
| 1130 |
Minimum Cost Tree From Leaf Values |
C# |
Medium |
| 1131 |
Maximum of Absolute Value Expression |
C# |
Medium |
| 1132 |
Report Contiguous Dates |
SQL |
Easy |
| 1139 |
Largest 1-Bordered Square |
C# |
Medium |
| 1140 |
Stone Game II |
C# |
Medium |
| 1141 |
User Activity for the Past 30 Days I |
SQL |
Easy |
| 1143 |
Longest Common Subsequence |
C# |
Medium |
| 1144 |
Decrease Elements To Make Array Zigzag |
C# |
Medium |
| 1145 |
Binary Tree Coloring Game |
C# |
Medium |
| 1146 |
Snapshot Array |
C# |
Medium |
| 1147 |
Longest Chunked Palindrome Decomposition |
C# |
Hard |
| 1148 |
Article Views I |
SQL |
Easy |
| 1154 |
Day of the Year |
C# |
Easy |
| 1155 |
Number of Dice Rolls With Target Sum |
C# |
Medium |
| 1156 |
Swap For Longest Repeated Character Substring |
C# |
Medium |
| 1157 |
Online Majority Element In Subarray |
C# |
Hard |
| 1158 |
Market Analysis I |
SQL |
Easy |
| 1160 |
Find Words That Can Be Formed by Characters |
C# |
Easy |
| 1161 |
Maximum Level Sum of a Binary Tree |
C# |
Medium |
| 1162 |
As Far from Land as Possible |
C# |
Medium |
| 1163 |
Last Substring in Lexicographical Order |
C# |
Hard |
| 1164 |
Product Sales Analysis III |
SQL |
Easy |
| 1169 |
Invalid Transactions |
C# |
Medium |
| 1170 |
Compare Strings by Frequency of the Smallest Character |
C# |
Medium |
| 1171 |
Remove Zero Sum Consecutive Nodes from Linked List |
C# |
Medium |
| 1172 |
Goat Latin |
C# |
Easy |
| 1174 |
Immediate Food Delivery I |
SQL |
Easy |
| 1175 |
Prime Arrangements |
C# |
Easy |
| 1177 |
Can Make Palindrome from Substring |
C# |
Medium |
| 1178 |
Number of Valid Words for Each Puzzle |
C# |
Medium |
| 1179 |
Reformat Department Table |
SQL |
Easy |
| 1184 |
Distance Between Bus Stops |
C# |
Easy |
| 1185 |
Day of the Week |
C# |
Easy |
| 1186 |
Maximum Subarray Sum with One Deletion |
C# |
Medium |
| 1187 |
Easiest Problem Ever |
C# |
Easy |
| 1189 |
Maximum Number of Balloons |
C# |
Easy |
| 1190 |
Reverse Substrings Between Each Pair of Parentheses |
C# |
Medium |
| 1191 |
K Concatenation Maximum Sum |
C# |
Medium |
| 1192 |
Critical Connections in a Network |
C# |
Hard |
| 1193 |
Monthly Transactions I |
SQL |
Easy |
| 1195 |
Fizz Buzz Multithreaded |
C# |
Medium |
| 1200 |
Minimum Absolute Difference |
C# |
Easy |
| 1201 |
Ugly Number III |
C# |
Medium |
| 1202 |
Smallest String With Swaps |
C# |
Medium |
| 1203 |
Sort Items by Groups Respecting Dependencies |
C# |
Hard |
| 1204 |
Last Person to Fit in the Bus |
SQL |
Medium |
| 1206 |
Design Skiplist |
C# |
Hard |
| 1207 |
Unique Number of Occurrences |
C# |
Easy |
| 1208 |
Get Equal Substrings Within Budget |
C# |
Medium |
| 1209 |
Remove All Adjacent Duplicates in String II |
C# |
Medium |
| 1210 |
Minimum Moves to Reach Target with Rotations |
C# |
Hard |
| 1211 |
Queries Quality and Percentage |
SQL |
Easy |
| 1217 |
Minimum Cost to Move Chips to The Same Position |
C# |
Easy |
| 1218 |
Longest Arithmetic Subsequence of Given Difference |
C# |
Medium |
| 1219 |
Path with Maximum Gold |
C# |
Medium |
| 1220 |
Count Vowels Permutation |
C# |
Hard |
| 1221 |
Split a String in Balanced Strings |
C# |
Easy |
| 1222 |
Queens That Can Attack the King |
C# |
Medium |
| 1431 |
Kids With the Greatest Number of Candies |
C# |
Easy |
| 1433 |
Check If a String Can Break Another String |
C# |
Medium |
| 1768 |
Merge Strings Alternately |
C# |
Easy |
| 1971 |
Find if Path Exists in Graph |
C# |
Easy |
| 2620 |
Counter |
TypeScript |
Easy |
| 2622 |
Cache With Time Limit |
TypeScript |
Medium |
| 2621 |
Sleep |
TypeScript |
Easy |
| 2623 |
Memoize |
TypeScript |
Medium |
| 2625 |
Flatten Deeply Nested Array |
TypeScript |
Medium |
| 2626 |
Array Reduce Transformation |
TypeScript |
Easy |
| 2627 |
Debounce |
TypeScript |
Medium |
| 2629 |
Function Composition |
TypeScript |
Easy |
| 2631 |
Group By |
TypeScript |
Medium |
| 2634 |
Filter Elements from Array |
TypeScript |
Easy |
| 2635 |
Apply Transform Over Each Element in Array |
TypeScript |
Easy |
| 2637 |
Promise Time Limit |
TypeScript |
Medium |
| 2665 |
Counter II |
TypeScript |
Easy |
| 2666 |
Allow One Function Call |
TypeScript |
Easy |
| 2667 |
Create Hello World Function |
TypeScript |
Easy |
| 2677 |
Array Prototype Last |
TypeScript |
Easy |
| 2694 |
Event Emitter |
TypeScript |
Medium |
| 2695 |
Array Wrapper |
TypeScript |
Easy |
| 2703 |
Return Length of Arguments Passed |
TypeScript |
Easy |
| 2704 |
To Be Or Not To Be |
TypeScript |
Easy |
| 2705 |
Compact Object |
TypeScript |
Medium |
| 2715 |
Timeout Cancellation |
TypeScript |
Easy |
| 2721 |
Execute Asynchronous Functions in Parallel |
TypeScript |
Medium |
| 2722 |
Join Two Arrays by ID |
TypeScript |
Medium |
| 2723 |
Add Two Promises |
TypeScript |
Easy |
| 2724 |
Sort By |
TypeScript |
Easy |
| 2725 |
Interval Cancellation |
TypeScript |
Easy |
| 2726 |
Calculator with Method Chaining |
TypeScript |
Easy |
| 2727 |
Is Object Empty |
TypeScript |
Easy |