Recognition signal
When should you think of Maths?
Number properties, divisibility, digit structure, or bounded arithmetic matter more than a data structure.
17 worked problems
Maths
Divisors, primes, and number theory for interviews. Number properties, divisibility, digit structure, or bounded arithmetic matter more than a data structure.
Core invariant
What must stay true?
Every transformation preserves the target numeric relationship while reducing the remaining work.
Practice in a deliberate order
Starter
Build the template
Core
Recognize variations
Stretch
Combine ideas under pressure
- No stretch problem is published yet.
What to learn in this cluster
- 01Digits and overflow
- 02Divisors and primes
- 03Combinatorics and binary exponentiation
All Maths problems
17 of 17 walkthroughsNo matching problems. Try another title, tag, or difficulty.
- #9 Palindrome Numbermath · two-pointersEasy
- #69 Sqrt(x)math · binary-searchEasy
- #168 Excel Sheet Column Titlemath · stringEasy
- #171 Excel Sheet Column Numbermath · stringEasy
- #202 Happy Numbermath · two-pointers · cycle-detectionEasy
- #263 Ugly NumbermathEasy
- #268 Missing Numbermath · bit-manipulation · arrayEasy
- #326 Power of Threemath · recursionEasy
- #342 Power of Fourmath · bit-manipulation · recursionEasy
- GFG Print All Divisors of a Numbermaths · divisors · sqrtEasy
- #7 Reverse Integermath · overflowMedium
- #43 Multiply Stringsmath · strings · simulationMedium
- #166 Fraction to Recurring Decimalmath · hash-table · stringsMedium
- #172 Factorial Trailing ZeroesmathMedium
- #204 Count Primesmath · sieve · arrayMedium
- #343 Integer Breakmath · dynamic-programmingMedium
- GFG Sieve of Eratosthenesmaths · primes · sieveMedium
Continue the cluster