- http://codeforces.com/problemset/problem/628/F
- http://codeforces.com/gym/100729 : Problem F
- http://codeforces.com/gym/100517 : Problem H
- http://codeforces.com/gym/101128 : Problem F
- http://codeforces.com/gym/100491 : Problem A
- http://codeforces.com/gym/101175 : Problem D (WF)
- http://codeforces.com/gym/101221 : Problem I (WF)
- http://codeforces.com/gym/100800 : Problem A
- http://codeforces.com/gym/101239 : Problem C (WF)
- http://codeforces.com/gym/101208 : Problem C (WF)
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/- https://leanprover-community.github.io/lean-web-editor -/ | |
import data.real.basic | |
import init.classical | |
import algebra.invertible | |
import algebra.euclidean_domain | |
import tactic.ring_exp | |
/- Problem: Find all functions satisfying `prop` -/ | |
def prop (f : ℝ → ℝ) : Prop := |