In an unordered map of C++, a plethora of functions is present. The most useful among them are = operator, [] operator, iterator begin and end, size and empty for capacity, lookup find and count, modification-
Theunordered_maplibrary in C++ contains many utility functions to support the working of the structure. One of them is at theat()methodwhich is used to extract the value present in the map for the keyk. Syntax mapped_type& at ( const key_type& k ); const mapped_type& at ( const ke...
您可以在how-to-use-unordered_map-efficiently-in-c上阅读更多相关信息。在这种情况下,强烈建议使用地图来避免出现 TLE 错误。 C++ // C++ program to demonstrate functionality of unordered_map #include<iostream> #include<unordered_map> usingnamespacestd; intmain() { // Declaring umap to be of <stri...
Member functions Sr.No.Method & Description 1 unordered_multimap::begin() container iterator Returns an iterator which refers to the first element of the unordered_mulitmap. 2 unordered_multimap::begin() bucket iterator Returns an iterator pointing to the first element in one of its buckets. 3...
Non-member functions operator==operator!= (C++11)(C++11)(removed in C++20) compares the values in the unordered_map (function template) std::swap(std::unordered_map) (C++11) specializes thestd::swapalgorithm (function template) erase_if(std::unordered_map) ...
The member functions return the size of bucket number nbucket.ExampleC++ Copy // std__unordered_map__unordered_map_bucket_size.cpp // compile with: /EHsc #include <unordered_map> #include <iostream> typedef std::unordered_map<char, int> Mymap; int main() { Mymap c1; c1.insert(My...
The member functions return the size of bucket number nbucket.ExampleC++ Copy // std__unordered_map__unordered_map_bucket_size.cpp // compile with: /EHsc #include <unordered_map> #include <iostream> typedef std::unordered_map<char, int> Mymap; int main() { Mymap c1; c1.insert(My...
The member functions return the size of bucket number nbucket.ExampleC++ Copy // std__unordered_map__unordered_map_bucket_size.cpp // compile with: /EHsc #include <unordered_map> #include <iostream> typedef std::unordered_map<char, int> Mymap; int main() { Mymap c1; c1.insert(My...
unordered_map bucket() in C++ STL unordered_map::bucket()是 C++ 中内置的 STL 函数,它返回具有键 k 的元素在地图中所在的桶号。语法: size_type bucket(key) 参数:该函数接受一个强制参数key,它指定要返回桶号的key。返回值:该方法返回一个无符号整数类型,表示参数中传入的key k的桶号。下面的程序说明...
Member functions unordered_map::unordered_map unordered_map::~unordered_map unordered_map::operator= unordered_map::get_allocator Iterators unordered_map::beginunordered_map::cbegin unordered_map::endunordered_map::cend Capacity unordered_map::size ...