#include <unordered_map>#include <string>int main(){// 哈希表默认初始化// 函数原型:unordered_map();// 创建一个空的 unordered_map 容器std::unordered_map<std::string, int> umap1;// 使用列表初始化// 函数原型:unordered_map(initializer_list<value_type>);// 使用初始化列表创建 unordered_map...
std::unordered_mapis an associative container that contains key-value pairs with unique keys. Search, insertion, and removal of elements have average constant-time complexity. Internally, the elements are not sorted in any particular order, but organized into buckets. Which bucket an element is pl...
The unordered_map has the ability to store data in the form of key-value pairs. Theinsertion,deletion, and theupdationoperations have O(1) average time complexity, making unordered_map a fast data structure. The searching in the unordered_map is also very fast (O(1) average time complexity...
Time complexity Constant i.e. O(1) in average case. Linear i.e. O(n) in worst case. Example The following example shows the usage of std::unordered_map::insert() function. #include<iostream>#include<unordered_map>usingnamespacestd;intmain(void){unordered_map<char,int>um={{'a',1},...
源于https://en.cppreference.com/w/cpp/container/unordered_set的说明 Search, insertion, and removal have average constant-time complexity. Internally, the elements are not sorted in any particular order, bu...unordered_set使用介绍 unordered_set C++ 11,新的关联容器:unordered_set 基本介绍 set和m...
Search, insertion, and removal have average constant-time complexity. Internally, the elements are not sorted in any particular order, but organized into buckets. Which bucket an element is placed into depends entirely on the hash of its value. This allows fast access to individual elements, ...
Time complexity Constant i.e. O(1) in average case. Linear i.e. O(n) in worst case. Example The following example shows the usage of std::unordered_map::insert() function. #include<iostream>#include<unordered_map>usingnamespacestd;intmain(void){unordered_map<char,int>um={{'a',1},...
Unordered set is an associative container that contains a set of unique objects of type Key. Search, insertion, and removal have average constant-time complexity. Internally, the elements are not sorted in any particular order, but organized into buckets. Which bucket an element is placed into ...
container that supports equivalent keys (an unordered_multimap may contain multiple copies of each key value) and that associates values of another type with the keys. The unordered_multimap class supports forward iterators. Search, insertion, and removal have average constant-time complexity. ...
X::mapped_type T std::unordered_map and std::unordered_multimap only X::value_type Key std::unordered_set and std::unordered_multiset only. Erasable in X std::pair<const Key, T> std::unordered_map and std::unordered_multimap only. Erasable in X X::hasher Hash Hash X::key_eq...