speedster's blog

By speedster, history, 11 years ago, In English

How to solve this

  • Vote: I like it
  • +1
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11 years ago, hide # |
 
Vote: I like it +5 Vote: I do not like it

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