| 301 |
Remove Invalid Parentheses |
Hard |
|
| 303 |
Range Sum Query - Immutable |
Easy |
|
| 304 |
Range Sum Query 2D - Immutable |
Medium |
|
| 306 |
Additive Number |
Medium |
|
| 307 |
Range Sum Query - Mutable |
Medium |
|
| 309 |
Best Time to Buy and Sell Stock with Cooldown |
Medium |
|
| 310 |
Minimum Height Trees |
Medium |
|
| 312 |
Burst Balloons |
Hard |
|
| 313 |
Super Ugly Number |
Medium |
|
| 315 |
Count of Smaller Numbers After Self |
Hard |
|
| 316 |
Remove Duplicate Letters |
Medium |
|
| 318 |
Maximum Product of Word Lengths |
Medium |
|
| 319 |
Bulb Switcher |
Medium |
|
| 322 |
Coin Change |
Medium |
|
| 323 |
Number of Connected Components in an Undirected Graph |
Medium |
|
| 324 |
Wiggle Sort II |
Medium |
|
| 326 |
Power of Three |
Easy |
|
| 327 |
Count of Range Sum |
Hard |
|
| 328 |
Odd Even Linked List |
Medium |
|
| 329 |
Longest Increasing Path in a Matrix |
Hard |
|
| 330 |
Patching Array |
Hard |
|
| 331 |
Verify Preorder Serialization of a Binary Tree |
Medium |
|
| 332 |
Reconstruct Itinerary |
Medium |
|
| 333 |
Largest BST Subtree |
Medium |
Tree
|
| 334 |
Increasing Triplet Subsequence |
Medium |
|
| 335 |
Self Crossing |
Hard |
|
| 336 |
Palindrome Pairs |
Hard |
|
| 337 |
House Robber III |
Medium |
Tree
|
Depth-first Search
|
| 338 |
Counting Bits |
Medium |
|
| 341 |
Flatten Nested List Iterator |
Medium |
|
| 342 |
Power of Four |
Easy |
|
| 343 |
Integer Break |
Medium |
|
| 344 |
Reverse String |
Easy |
|
| 345 |
Reverse Vowels of a String |
Easy |
|
| 347 |
Top K Frequent Elements |
Medium |
|
| 349 |
Intersection of Two Arrays |
Easy |
|
| 350 |
Intersection of Two Arrays II |
Easy |
|
| 352 |
Data Stream as Disjoint Intervals |
Hard |
|
| 354 |
Russian Doll Envelopes |
Hard |
|
| 355 |
Design Twitter |
Medium |
|
| 357 |
Count Numbers with Unique Digits |
Medium |
|
| 365 |
Water and Jug Problem |
Medium |
|
| 366 |
Find Leaves of Binary Tree |
Medium |
Tree
|
Depth-first Search
|
| 367 |
Valid Perfect Square |
Easy |
|
| 368 |
Largest Divisible Subset |
Medium |
|
| 371 |
Sum of Two Integers |
Medium |
|
| 372 |
Super Pow |
Medium |
|
| 373 |
Find K Pairs with Smallest Sums |
Medium |
|
| 374 |
Guess Number Higher or Lower |
Easy |
|
| 375 |
Guess Number Higher or Lower II |
Medium |
|
| 376 |
Wiggle Subsequence |
Medium |
|
| 377 |
Combination Sum IV |
Medium |
|
| 378 |
Kth Smallest Element in a Sorted Matrix |
Medium |
|
| 380 |
Insert Delete GetRandom O(1) |
Medium |
|
| 381 |
Insert Delete GetRandom O(1) - Duplicates allowed |
Hard |
|
| 382 |
Linked List Random Node |
Medium |
|
| 383 |
Ransom Note |
Easy |
|
| 384 |
Shuffle an Array |
Medium |
|
| 385 |
Mini Parser |
Medium |
|
| 386 |
Lexicographical Numbers |
Medium |
|
| 387 |
First Unique Character in a String |
Easy |
|
| 388 |
Longest Absolute File Path |
Medium |
|
| 389 |
Find the Difference |
Easy |
|
| 390 |
Elimination Game |
Medium |
|
| 391 |
Perfect Rectangle |
Hard |
|
| 392 |
Is Subsequence |
Easy |
|
| 393 |
UTF-8 Validation |
Medium |
|
| 394 |
Decode String |
Medium |
|
| 395 |
Longest Substring with At Least K Repeating Characters |
Medium |
|
| 396 |
Rotate Function |
Medium |
|
| 397 |
Integer Replacement |
Medium |
|
| 398 |
Random Pick Index |
Medium |
|
| 399 |
Evaluate Division |
Medium |
|
| 400 |
Nth Digit |
Medium |
|