problem link:https://mirror.codeforces.com/contest/1352/problem/E

sol link with vctor :https://mirror.codeforces.com/contest/1352/submission/214450956

sol link with map :https://mirror.codeforces.com/contest/1352/submission/214450292

your valuable opinion will surely help others who's are like me. and if does not make any sense than please comment section is available, i will delete it.

Well i already solved 400 problems but was not able to reach at pupil. now should i solve from a20j ladder many coders say that it wouldnt be helpful nowdays. And also few high profile coder recommend to solve from a2oj. what should i do how should i solve? which startegy should i follow? Definetely target is not for pupil. I highly appreciate your time and consideration to me, wish you all will be happy with cp career, and i dont know should i quite it or not! sorry for using tourist's photo without taking the permission from him.