your unordered_map got an anti-hash test(unordered_map worst case look time O(n) due to all hashes colliding with each other). And because MS C++ 2017 is a different compiler, so unordered map hashing works a bit different. In whatever way, the three should get timelimit anyways. I recommend you not to use unordered_map in hackable contests or in sites that have system testing afterwards like codeforces.