I am seeking for you advice: how to improve my skill of figuring out edge cases? I have faced a couple of WA on 100+, 300+ test cases and each of the times I wasn't able to get what was that edge case by myself. Hence, I am asking you guys for an advice :)
And in particular — what is the edge case here?
This is my submission: https://codeforces.com/contest/264/submission/159610034 This is the problem: https://codeforces.com/contest/264/problem/B