IQ is a meme and you'll become one too if you keep writing dumb shit like this. You can always perform better.

exactly :(

They could have followed a simple startegy "If you cannot prove your greedy, don't make the problem". Doesn't matter what contestants thought. It's a high pressure situation and most teams would "submit and think" rather than "think and submit" especially when there are other problems to focus on.

No one is holding the guy responsible, it's about Codechef not doing the right thing which is to simply delete the problem and the corresponding score from the official ranklist.

Stresstesting is the reason. The problem with asking for a formal proof is that many people can't write a formal proof, so you get an informal one that omits something essential... then you have to work your way through it slowly or you'll miss it too. See problem Skyscrapers at CEOI, I spent a shitload of time on understanding why the proof works, only to end up concluding that it doesn't and changing the problem so it would. In problems like this one, though, it would be fairly easy to catch mistakes just by stresstesting.

CC testing practices are mostly writing a solution, briefly checking if the author's makes sense, validating I/O and making up some wrong solutions that shouldn't pass (but rarely in an elaborate way). It's less detailed than on CF because there's just one tester, too.

But they forwarded the ranklist right ?