Let's discuss the solutions of all the problems. I am only able to solve A-Small and A-Large. I would like to know other peoples approaches for the other 3 problems. Also how should I prepare for it to get the rank below 300 in the next round.

Here are the problem statements.

• Problem A. Sherlock and Parentheses

• Problem B. Sherlock and Watson Gym Secrets

• Problem C. Watson and Intervals

• Problem D. Sherlock and Permutation Sorting