function for searching in map in c++
// C++ program for illustration
// of map::find() function
#include <bits/stdc++.h>
using namespace std;
int main()
{
// initialize container
multimap<int, int> mp;
// insert elements in random order
mp.insert({ 2, 30 });
mp.insert({ 1, 40 });
mp.insert({ 3, 20 });
mp.insert({ 4, 50 });
cout << "The elements from position 3 in map are : \n";
cout << "KEY\tELEMENT\n";
// find() function finds the position at which 3 is
for (auto itr = mp.find(3); itr != mp.end(); itr++)
cout << itr->first
<< '\t' << itr->second << '\n';
return 0;
}