zarif_2002's blog

unordered map vs map
By zarif_2002, history, 6 years ago, In English

https://codeforces.me/contest/808/problem/D

unordered_map took me to tle but map took me to ac.

unordered_map submission https://codeforces.me/contest/808/submission/48371065

map submission https://codeforces.me/contest/808/submission/48371396

but we know generally unordered_map works in O(1) time where map works in O(log n) time. so, why this occurs. please.

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6 years ago, # |
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https://codeforces.me/blog/entry/62393

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    6 years ago, # ^ |
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    Generally, if one already know the hash function(like the one in unordered_map) you use in your code, then one could make mean data to blow it up(if your hash function is not safe enough), while map(RBTree) is stable.

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