Ходят слухи, что функция count в std::map работает за линейное время от количества элементов. Правда это или нет?
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No, it is perfect
O(logN)
for each operation. Maybe you are confused by work ofunordered_map
that can make O(n) operations in worst case.what about some Meet-in-the-Middle problems, where map is getting Time Limit and lower_bound getting AC