Coding Problems

Generate all valid combinations of n pairs of balanced parentheses.

Convert a number from one base to another base. Support bases 2 to 36.

Count unique paths from top-left to bottom-right in a grid. You can only move right or down.

Group words that are anagrams of each other. Words in same group should be together.

Find all prime factors of a given number and their powers.

Find the length of longest common subsequence between two strings.

Calculate sum of both diagonals in a square matrix. Count center element only once if matrix size is odd.

Check if a binary tree is a valid binary search tree.

Given a positive integer, find its digital root. The digital root is obtained by repeatedly summing all digits until a s...

Create a function that validates password strength based on specific criteria: at least 8 characters, contains uppercase...