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Map Multimap
Multimap can return the number of pairs with the same key
#include
#include
using namespace std; typedef map
MAP_INT_STRING; typedef multimap
MMAP_INT_STRING; int main () { MMAP_INT_STRING mmapIntToString; mmapIntToString.insert (MMAP_INT_STRING::value_type (3, "Three")); mmapIntToString.insert (MMAP_INT_STRING::value_type (45, "Forty Five")); cout << "The number of pairs in the multimap with 1000 as their key: " << mmapIntToString.count (1000) << endl; return 0; }