Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 151 | Detect Capital | Easy | String |
| 152 | Determine Color of a Chessboard Square | Easy | MathString |
| 153 | Diameter of Binary Tree | Easy | TreeDepth-First SearchBinary Tree |
| 154 | Different Ways to Add Parentheses | Medium | MathStringDynamic Programming |
| 155 | Distance to a Cycle in Undirected Graph | Hard | Depth-First SearchBreadth-First SearchUnion Find |
| 156 | Divide Chocolate | Hard | ArrayBinary Search |
| 157 | Duplicate Zeros | Easy | ArrayTwo Pointers |
| 158 | Elimination Game | Medium | MathRecursion |
| 159 | Encode and Decode TinyURL | Medium | Hash TableStringDesign |
| 160 | Encode N-ary Tree to Binary Tree | Hard | TreeDepth-First SearchBreadth-First Search |
| 161 | Equal Rational Numbers | Hard | MathString |
| 162 | Equalize Strings by Adding or Removing Characters at Ends | Medium | StringBinary SearchDynamic Programming |
| 163 | Fibonacci Number | Easy | MathDynamic ProgrammingRecursion |
| 164 | Find a Safe Walk Through a Grid | Medium | ArrayBreadth-First SearchGraph |
| 165 | Find Cities in Each State II | Medium | Database |
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