Feb 12, 2014 · Yes, you can associate a complexity with std::map operations because they are written into the specification. In particular, a "sorted array" implementation of std::map is non …

Jul 12, 2024 · With C++11, we finally received a hash set and hash map in std::unordered_set and std::unordered_map. This reduced the time complexity to O (1) for operation like insertion, …

Dec 13, 2022 · The map <int, int> M is the implementation of self-balancing Red-Black Trees. The unordered_map<int, int> M is the implementation of Hash Table which makes the complexity …

The complexity of your program with map<vector,int> is $$$O(n^2)$$$, assuming that $$$a_i \leq n$$$. Using an unordered_map will just remove a log factor, try improving your complexity by …

For set, multiset, map, multimap the time complexity for insertion, deletion and retrieving information is O(logn) as they follow the balance binary tree to structure the data. For …

Apr 14, 2023 · To retrieve the top k elements, we need to perform k iterations of finding the maximum element and erasing it from the map, which takes O(log n) time per iteration. …

Mar 13, 2023 · In C++, unordered_map is an unordered associative container that stores data in the form of unique key-value pairs. But unlike map, unordered map stores its elements using …

Based on practical evidence, the constant factor built into unordered_map is not that big. The problem is not in the constant factor, but in the fact that worst-case time complexity for a …

Dec 9, 2009 · You'd have to prove that your implementation is significantly better so that you can justify the time spent. Then try your implementation with different compilers and see what …

Jun 12, 2012 · O (N) just says that there exists an n and a k such that for N > n the thing being measured (time / CPU ticks) is less than kN. An O (1) process can satisfy this with whatever n …