http://codeforces.com/contest/186/problem/C
how to start thinking about this type of problems
okay now i know the solution but i dont know the way of thinking to solve this type of problems
thank you in advance
Math
http://codeforces.com/contest/186/problem/C
how to start thinking about this type of problems
okay now i know the solution but i dont know the way of thinking to solve this type of problems
thank you in advance