Coding Challenges

Implement Caesar cipher for basic text encryption.

Count the number of vowels in a string.

Transpose a given 2D matrix.

Compress a string by counting repeated characters.

Find duplicate numbers in an array.

Find the longest substring without repeating characters.

Merge two sorted arrays into one sorted array.

Rotate an array to the right by k steps.

Check if the parentheses in a string are balanced.