The map::count() is a built-in function in C++ STL which returns 1 if the element with key K is present in the map container. It returns 0 if the element with key K is not present in the container.
Parameters: The function accepts a mandatory parameter k which specifies the key to be searched in the map container.
Return Value: The function returns the number of times the key K is present in the map container. It returns 1 if the key is present in the container as the map only contains a unique key. It returns 0 if the key is not present in the map container.
Below program illustrates the above function:
The key 1 is present The key 100 is not present