Practice problems across 75+ categories
Practice problems frequently asked at Combinatorics • 55 problems | 3 Easy | 18 Medium | 34 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Count Ways to Build Rooms in an Ant Colony | Hard | MathDynamic ProgrammingTree |
| 17 | Count Ways to Make Array With Product | Hard | ArrayMathDynamic Programming |
| 18 | Distribute Candies Among Children I | Easy | MathCombinatoricsEnumeration |
| 19 | Distribute Candies Among Children II | Medium | MathCombinatoricsEnumeration |
| 20 | Distribute Candies Among Children III | Hard | MathCombinatorics |
| 21 | Find Number of Ways to Reach the K-th Stair | Hard | MathDynamic ProgrammingBit Manipulation |
| 22 | Find Sum of Array Product of Magical Sequences | Hard | ArrayMathDynamic Programming |
| 23 | Find the Count of Good Integers | Hard | Hash TableMathCombinatorics |
| 24 | Find the Count of Monotonic Pairs I | Hard | ArrayMathDynamic Programming |
| 25 | Find the Count of Monotonic Pairs II | Hard | ArrayMathDynamic Programming |
| 26 | Find the Derangement of An Array | Medium | MathDynamic ProgrammingCombinatorics |
| 27 | Find the N-th Value After K Seconds | Medium | ArrayMathSimulation |
| 28 | Find the Number of Possible Ways for an Event | Hard | MathDynamic ProgrammingCombinatorics |
| 29 | Find Triangular Sum of an Array | Medium | ArrayMathSimulation |
| 30 | Kth Smallest Amount With Single Denomination Combination | Hard | ArrayMathBinary Search |
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