https://mirror.codeforces.com/contest/1691/submission/159098417
Why does this solution fail on test 30 (TLE)? this is an O(n) solution and also this shouldn't have run more then O(1) time complexity.
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This TLE is repeated more and more nowadays in codeforces and the reason is same.
I just replace unordered_map with map and it get accepted
unordered_map cause TLE because of its bad hashing function, but to override this you can check this blog for most efficient custom hashing.
upd: accepted code using unordered_map with custom hash.
Thank you very much I thought using using unordered_map will give me a lesser time complexity