I've got AC with greedy algorithm, but didn't prove it on the contest of course. Now I'm interested if it's correct or just the tests are too weak.

Authors - feel free to take my solution and challenge it.

New anti-greedy tests were added (and your solution gets WA on them). But your submit from the online contest will not be rejudged.

But why is it still marked as solved in problemset? I think before wrong accepted solutions were considered only in contest standings. Something changed?