Coding Challenges

Find the fewest number of coins needed to make up a given amount.

Find the contiguous subarray with the largest sum.

Count distinct ways to climb to the top with 1 or 2 steps.

Generate all combinations of valid parentheses.

Solve the N-Queens problem using backtracking.

Check if a Sudoku board is valid.

Design and implement an LRU cache.

Flatten a deeply nested list into a flat one.

Count the frequency of each word in a sentence.