Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | CEO Subordinate Hierarchy | Hard | Database |
| 62 | Chalkboard XOR Game | Hard | ArrayMathBit Manipulation |
| 63 | Champagne Tower | Medium | Dynamic Programming |
| 64 | Change the Root of a Binary Tree | Medium | TreeDepth-First SearchBinary Tree |
| 65 | Check Balanced String | Easy | String |
| 66 | Check Completeness of a Binary Tree | Medium | TreeBreadth-First SearchBinary Tree |
| 67 | Check if a String Is an Acronym of Words | Easy | ArrayString |
| 68 | Check if an Array Is Consecutive | Easy | ArrayHash TableSorting |
| 69 | Check If It Is a Straight Line | Easy | ArrayMathGeometry |
| 70 | Check If N and Its Double Exist | Easy | ArrayHash TableTwo Pointers |
| 71 | Check if One String Swap Can Make Strings Equal | Easy | Hash TableStringCounting |
| 72 | Check If String Is a Prefix of Array | Easy | ArrayTwo PointersString |
| 73 | Check if the Sentence Is Pangram | Easy | Hash TableString |
| 74 | Check If Two String Arrays are Equivalent | Easy | ArrayString |
| 75 | Climbing Stairs | Easy | MathDynamic ProgrammingMemoization |
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