Add solution to problem Sherlock and Wason. It's a buffer ring problem, but since all the operations are batched together, we can just reverse the index.
Add solution to problem Sherlock and Wason. It's a buffer ring problem, but
since all the operations are batched together, we can just reverse the index.

advancedxy/hackerrank,advancedxy/hackerrank,advancedxy/hackerrank