#include<iostream>
#include<map>
void remove(std::map<int,int> &m, int index)
{
	for (auto itr = m.cbegin(), itr2 = itr; itr != m.cend(); itr = itr2)
	{
		++itr2;
		if (itr->first<index)
		{
			m.erase(itr);
		}
	}
}
int main()
{
std::map<int, int> map {{7,1}, {3,8}, {5,7}, {1,4}, {4,5}, {8,3}};
remove(map,5);
for(auto pair: map){
std:: cout<< pair.first<<" "<<pair.second<<std::endl;}
}