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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.
At least it could have given TLE at the time of contest so i would have changed the unordered_map to map.
Sadly, authors usually don't usually think of anti-hashing tests but hackers do. Here is a really cool blog which helps if you want to use unordered_map.
But here all keys are ints and not int64_t/long longs, so their hashes do not (should not?) collide, so what's the real reason?
Numbers till $$$10^9$$$. At least not all hashes collide, but a lot of them. If numbers were only till $$$10^6$$$ or lower, I guess it was gonna pass.
Yeah, I did not realize that the hash function includes % bucket_count, thank you