After trying so hard, I could not solve problem A or problem B today, they were both so hard, help me how could i have solved it.

I thought there would be some logical solution for A, i thought of using STack, binary search in problem A.

But the solution is loops for 100 times? I dont understand what is purpose of such problems.

I want to quit cp after today.

ANy tips on how to solve problems will be appreciated.

Thanks