Practice problems across 75+ categories
Practice problems frequently asked at Math • 596 problems | 150 Easy | 283 Medium | 161 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Count Total Number of Colored Cells | Medium | Math |
| 137 | Count Triplets That Can Form Two Arrays of Equal XOR | Medium | ArrayHash TableMath |
| 138 | Count Valid Paths in a Tree | Hard | MathDynamic ProgrammingTree |
| 139 | Count Ways to Build Rooms in an Ant Colony | Hard | MathDynamic ProgrammingTree |
| 140 | Count Ways to Make Array With Product | Hard | ArrayMathDynamic Programming |
| 141 | Create Components With Same Value | Hard | ArrayMathTree |
| 142 | Day of the Week | Easy | Math |
| 143 | Day of the Year | Easy | MathString |
| 144 | Design an Expression Tree With Evaluate Function | Medium | ArrayMathStack |
| 145 | Determine Color of a Chessboard Square | Easy | MathString |
| 146 | Determine if a Cell Is Reachable at a Given Time | Medium | Math |
| 147 | Determine the Minimum Sum of a k-avoiding Array | Medium | MathGreedy |
| 148 | Detonate the Maximum Bombs | Medium | ArrayMathDepth-First Search |
| 149 | Difference Between Element Sum and Digit Sum of an Array | Easy | ArrayMath |
| 150 | Different Ways to Add Parentheses | Medium | MathStringDynamic Programming |
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