speedster's blog

By speedster, history, 9 years ago, In English

How to solve this

  • Vote: I like it
  • +1
  • Vote: I do not like it

| Write comment?
»
9 years ago, # |
  Vote: I like it +5 Vote: I do not like it

It's copied from http://mirror.codeforces.com/contest/513/problem/E1. So you can just read the editorial for that contest.