Apple
282 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 104. Maximum Depth of Binary Tree | Easy | 48.9% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 198. House Robber | Medium | 48.9% | TopicsArrayDynamic Programming |
| Binary Tree Paths | Easy | 48.9% | TopicsStringBacktrackingTreeDepth-First SearchBinary Tree |
| LFU Cache | Hard | 48.9% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| 621. Task Scheduler | Medium | 48.9% | TopicsArrayHash TableGreedySortingHeap (Priority Queue)Counting |
| 1047. Remove All Adjacent Duplicates In String | Easy | 48.9% | TopicsStringStack |
| 2023. Number of Pairs of Strings With Concatenation Equal to Target | Medium | 48.9% | TopicsArrayHash TableStringCounting |
| 2397. Maximum Rows Covered by Columns | Medium | 48.9% | TopicsArrayBacktrackingBit ManipulationMatrixEnumeration |
| 2972. Count the Number of Incremovable Subarrays II | Hard | 48.9% | TopicsArrayTwo PointersBinary Search |
| 2970. Count the Number of Incremovable Subarrays I | Easy | 48.9% | TopicsArrayTwo PointersBinary SearchEnumeration |
| 3030. Find the Grid of Region Average | Medium | 48.9% | TopicsArrayMatrix |
| 5. Longest Palindromic Substring | Medium | 46.2% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| 10. Regular Expression Matching | Hard | 46.2% | TopicsStringDynamic ProgrammingRecursion |
| 11. Container With Most Water | Medium | 46.2% | TopicsArrayTwo PointersGreedy |
| Remove Duplicates from Sorted Array | Easy | 46.2% | TopicsArrayTwo Pointers |
| 46. Permutations | Medium | 46.2% | TopicsArrayBacktracking |
| Implement Queue using Stacks | Easy | 46.2% | TopicsStackDesignQueue |
| Meeting Rooms | Easy | 46.2% | TopicsArraySortingQuicksort |
| Integer to English Words | Hard | 46.2% | TopicsMathStringRecursion |
| Find K Closest Elements | Medium | 46.2% | TopicsArrayTwo PointersBinary SearchSliding WindowSortingHeap (Priority Queue) |
| 733. Flood Fill | Easy | 46.2% | TopicsArrayDepth-First SearchBreadth-First SearchMatrix |
| Fibonacci Number | Easy | 46.2% | TopicsMathDynamic ProgrammingRecursionMemoization |
| 1143. Longest Common Subsequence | Medium | 46.2% | TopicsStringDynamic ProgrammingLongest Common Subsequence |
| String to Integer (atoi) | Medium | 43.2% | TopicsString |
| 19. Remove Nth Node From End of List | Medium | 43.2% | TopicsLinked ListTwo Pointers |
