Why my solution of C is getting TLE. Can anyone tell me please? Isn't it supposed to pass?
Is this happening because of using map. Please help me. I have to know this.
https://codeforces.net/submissions/tanvir942316
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Yes. Using map will make your solution $$$O(n \cdot log^2 n)$$$.
Putting $$$n = 10^6$$$, number of operations = $$$4 \times 10^8$$$. You can use
std::unordered_mapwhich gives constant time insertion and accessing on average ($$$O(n)$$$ in worst case). Your solution with unordered_map 173282698.But it is possible to blow up unordered_map (to make access and insertion of order $$$O(n)$$$) by specific type of input. To prevent it you can use custom hash function.
Read this for more details: Blowing up unordered_map, and how to stop getting hacked on it
P.S: See how many people got hacked (see hacks made by beethoven97) because they used
std::unordered_map.