Hello people of Codeforces,

I really hate problems with too many edge cases or difficult implementation, so I've been avoiding such problems for far too long. Because of that I am really bad with casework and implementation. Most of the time I can come up with solutions but fail to implement them before the timer runs out on me. So I have decided to suffer through such problems to improve my casework and implementation skills.

So give me the worst problems you have seen, problems with cruel edge cases or a cruel number of cases or problems with implementation much more difficult than their logic. Do your worst and I'll try my best to suffer through them.

Also share any cool implementation tricks you have for the problem with

or any general tricks to make the code smaller.

P.S. Is there anyone who actually enjoys casework !!!