Help !!!

https://codeforces.net/contest/1926/submission/275328157 & https://codeforces.net/contest/1926/submission/275328315 both these code correspond to the same logic, the difference is just in using map and unordered map, But first one, which is done by using unordered map results in TLE. But why? As far as I knew unordered_map requires lesser TC w.r.t map. Kindly correct me if I am wrong.