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// map::empty
#include <iostream>
#include <map>
int main ()
{
std::map<char,int> mymap;
mymap['a']=10;
mymap['b']=20;
mymap['c']=30;
while (!mymap.empty())
{
std::cout << mymap.begin()->first << " => " << mymap.begin()->second << '\n';
mymap.erase(mymap.begin());
}
return 0;
}
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