Coding interview problems
150 problems. Filter by topic or difficulty, then solve one in your browser.
| 3Sum of Digits | Beginner | ||
| 4Factorial | Beginner | ||
| 6Check Prime Number | Beginner | ||
| 9Count Even Numbers | Beginner | ||
| 10Leap Year | Beginner | ||
| 11Greatest Common Divisor | Beginner | ||
| 12Least Common Multiple | Beginner | ||
| 13Reverse the Digits | Beginner | ||
| 14Armstrong Number | Beginner | ||
| 16Count Digits | Beginner | ||
| 19Decimal to Binary | Beginner | ||
| 20Binary to Decimal | Beginner | ||
| 26Perfect Number | Beginner | ||
| 27Steps to Reduce a Number to Zero | Beginner | ||
| 30FizzBuzz | Beginner | ||
| 34Missing Number | Easy | ||
| 47Plus One | Easy | ||
| 51Square Root (Integer) | Easy | ||
| 68Roman to Integer | Easy | ||
| 77Palindrome Number | Easy | ||
| 106Unique Paths | Medium | ||
| 130Spiral Matrix | Medium |
