It's so strange. I can never get to the link http://codeforces.com/problemset/problem/1304/D . But other links are OK. Can anyone tell me why or how I can solve it? Thank you.
Help
It's so strange. I can never get to the link http://codeforces.com/problemset/problem/1304/D . But other links are OK. Can anyone tell me why or how I can solve it? Thank you.