unordered_map
C
unordered_map is an associated container that stores elements formed by combination of key value and a mapped value.
The key value is used to uniquely identify the element and mapped value is the content associated with the key.
Both key and value can be of any type predefined or user-defined.
// C++ program to demonstrate functionality of unordered_map
#include <iostream>
#include <unordered_map>
using namespace std;
int main()
{
// Declaring umap to be of <string, int> type
// key will be of string type and mapped value will
// be of double type
unordered_map<string, int> umap;
// inserting values by using [] operator
umap["GeeksforGeeks"] = 10;
umap["Practice"] = 20;
umap["Contribute"] = 30;
// Traversing an unordered map
for (auto x : umap)
cout << x.first << " " << x.second << endl;
}
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