TikTok
317 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 21. Merge Two Sorted Lists | Easy | 34.5% | TopicsLinked ListRecursion |
| 40. Combination Sum II | Medium | 34.5% | TopicsArrayBacktracking |
| 103. Binary Tree Zigzag Level Order Traversal | Medium | 34.5% | TopicsTreeBreadth-First SearchBinary Tree |
| Best Time to Buy and Sell Stock II | Medium | 34.5% | TopicsArrayDynamic ProgrammingGreedy |
| Best Time to Buy and Sell Stock III | Hard | 34.5% | TopicsArrayDynamic Programming |
| 125. Valid Palindrome | Easy | 34.5% | TopicsTwo PointersString |
| 2096. Step-By-Step Directions From a Binary Tree Node to Another | Medium | 34.5% | TopicsStringTreeDepth-First SearchBinary TreeBinary LiftingLowest Common Ancestor |
| 2115. Find All Possible Recipes from Given Supplies | Medium | 34.5% | TopicsArrayHash TableStringGraph TheoryTopological SortDirected Acyclic Graph |
| Largest Number | Medium | 34.5% | TopicsArrayStringGreedySorting |
| 188. Best Time to Buy and Sell Stock IV | Hard | 34.5% | TopicsArrayDynamic Programming |
| Maximal Square | Medium | 34.5% | TopicsArrayDynamic ProgrammingMatrix |
| 74. Search a 2D Matrix | Medium | 34.5% | TopicsArrayBinary SearchMatrix |
| 435. Non-overlapping Intervals | Medium | 34.5% | TopicsArrayDynamic ProgrammingGreedySorting |
| 443. String Compression | Medium | 34.5% | TopicsTwo PointersString |
| LFU Cache | Hard | 34.5% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| Coin Change II | Medium | 34.5% | TopicsArrayDynamic ProgrammingKnapsack ProblemComplete Knapsack |
| 525. Contiguous Array | Medium | 34.5% | TopicsArrayHash TablePrefix Sum |
| Design In-Memory File System | Hard | 34.5% | TopicsHash TableStringDesignTrieSorting |
| 621. Task Scheduler | Medium | 34.5% | TopicsArrayHash TableGreedySortingHeap (Priority Queue)Counting |
| 662. Maximum Width of Binary Tree | Medium | 34.5% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 680. Valid Palindrome II | Easy | 34.5% | TopicsTwo PointersStringGreedy |
| 752. Open the Lock | Medium | 34.5% | TopicsArrayHash TableStringBreadth-First SearchBidirectional Search |
| Convert Binary Search Tree to Sorted Doubly Linked List | Medium | 34.5% | TopicsLinked ListStackTreeDepth-First SearchBinary Search TreeBinary TreeDoubly-Linked List |
| 785. Is Graph Bipartite? | Medium | 34.5% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph TheoryGraph ColoringBipartite Graph |
| 799. Champagne Tower | Medium | 34.5% | TopicsDynamic Programming |
