Practice problems across 75+ categories
Practice problems frequently asked at Enumeration • 123 problems | 27 Easy | 61 Medium | 35 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 91 | Number of Arithmetic Triplets | Easy | ArrayHash TableTwo Pointers |
| 92 | Number of Black Blocks | Medium | ArrayHash TableEnumeration |
| 93 | Number of Common Factors | Easy | MathEnumerationNumber Theory |
| 94 | Number of Possible Sets of Closing Branches | Hard | Bit ManipulationGraphHeap (Priority Queue) |
| 95 | Number of Unique XOR Triplets II | Medium | ArrayMathBit Manipulation |
| 96 | Number of Valid Clock Times | Easy | StringEnumeration |
| 97 | Number of Ways to Buy Pens and Pencils | Medium | MathEnumeration |
| 98 | Partition Array into Two Equal Product Subsets | Medium | ArrayBit ManipulationRecursion |
| 99 | Permutations IV | Hard | ArrayMathCombinatorics |
| 100 | Powerful Integers | Medium | Hash TableMathEnumeration |
| 101 | Prime Pairs With Target Sum | Medium | ArrayMathEnumeration |
| 102 | Recover the Original Array | Hard | ArrayHash TableTwo Pointers |
| 103 | Remove Digit From Number to Maximize Result | Easy | StringGreedyEnumeration |
| 104 | Removing Minimum Number of Magic Beans | Medium | ArrayGreedySorting |
| 105 | Reordered Power of 2 | Medium | Hash TableMathSorting |
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