Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 106 | Count Integers With Even Digit Sum | Easy | MathSimulation |
| 107 | Count Items Matching a Rule | Easy | ArrayString |
| 108 | Count Nodes Equal to Average of Subtree | Medium | TreeDepth-First SearchBinary Tree |
| 109 | Count Nodes That Are Great Enough | Hard | Divide and ConquerTreeDepth-First Search |
| 110 | Count Number of Nice Subarrays | Medium | ArrayHash TableMath |
| 111 | Count Numbers With Unique Digits II | Easy | Hash TableMathDynamic Programming |
| 112 | Count Occurrences in Text | Medium | Database |
| 113 | Count Odd Numbers in an Interval Range | Easy | Math |
| 114 | Count of Sub-Multisets With Bounded Sum | Hard | ArrayHash TableDynamic Programming |
| 115 | Count Operations to Obtain Zero | Easy | MathSimulation |
| 116 | Count Pairs That Form a Complete Day II | Medium | ArrayHash TableCounting |
| 117 | Count Sorted Vowel Strings | Medium | MathDynamic ProgrammingCombinatorics |
| 118 | Count Square Submatrices with All Ones | Medium | ArrayDynamic ProgrammingMatrix |
| 119 | Count Square Sum Triples | Easy | MathEnumeration |
| 120 | Count Sub Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
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