Practice problems across 75+ categories
Practice problems frequently asked at Number Theory • 76 problems | 11 Easy | 33 Medium | 32 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Add Digits | Easy | MathSimulationNumber Theory |
| 2 | Apply Operations to Maximize Score | Hard | ArrayMathStack |
| 3 | Check if Any Element Has Prime Frequency | Easy | ArrayHash TableMath |
| 4 | Check If Digits Are Equal in String After Operations I | Easy | MathStringSimulation |
| 5 | Check If Digits Are Equal in String After Operations II | Hard | MathStringCombinatorics |
| 6 | Check If It Is a Good Array | Hard | ArrayMathNumber Theory |
| 7 | Check if Point Is Reachable | Hard | MathNumber Theory |
| 8 | Closest Prime Numbers in Range | Medium | MathNumber Theory |
| 9 | Count Array Pairs Divisible by K | Hard | ArrayMathNumber Theory |
| 10 | Count Beautiful Substrings I | Medium | Hash TableMathString |
| 11 | Count Beautiful Substrings II | Hard | Hash TableMathString |
| 12 | Count Connected Components in LCM Graph | Hard | ArrayHash TableMath |
| 13 | Count Prime-Gap Balanced Subarrays | Medium | ArrayMathQueue |
| 14 | Count Primes | Medium | ArrayMathEnumeration |
| 15 | Count the Number of Ideal Arrays | Hard | MathDynamic ProgrammingCombinatorics |
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