I want to learn a fast solution for
Bubble Cup 13 - Finals [Online Mirror, unrated, Div. 1] B Valuable Paper
https://codeforces.com/contest/1423
So I click here.
And sort all accepted solutions by Execution Time.
The fast one is https://codeforces.com/contest/1423/submission/94770930.
I read it carefully and found it is wrong. Then I noticed that it already has been hacked. https://codeforces.com/contest/1423/hacks/669563
Why does a hacked solution display as Accepted? I think it can mislead users.