Dear All,
Please recommend some annoying, implementation-heavy, and case-loaded Codeforces problems.
It will be even better if there exists an obvious solution that is very hard to implement and also a clever solution (with the same time complexity) that is easier to implement.
Basically, recommend any problem that you were very confident you could solve but somehow landed 5 WA verdicts and/or left in rage.
Platforms Jumping
It's easy but has a bit complex implementation.
Look at problems created by misof in Topcoder, most will satisfy your criteria.
Puzzle
It isn't from codeforces.
Bruteforce and 400 lines
https://open.kattis.com/problems/cars
Anadi And Domino (A bit tricky to implement).
I dont think so. It was really easy to implement once you get the idea. My submission -
https://mirror.codeforces.com/contest/1230/submission/68019924
Depends.