Good day everyone.

Yesterday me and my friend repeating did a warm up for the ACM contest that is coming up later this month.

We went to solve this contest from the gym 2015 PSUT Coding Marathon.

We solved almost all the problems except the last one problem L.

We didn't get any idea regarding the problem could someone please provide some help...a hint maybe.

We will be very grateful...thanks in advance!!!

:)