c++中删除map元素的三种方式

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//删除map元素的三种方式
//by 鸟哥
#include <iostream>
#include <map>
using namespace std;
void printMap(const map<string, int>& students)
{
for (auto ii = students.begin() ; ii != students.end() ; ii++)
{
cout <<"姓名:"<< ii->first
<< " 年龄: " << ii->second
<< endl;
}
cout<<endl;
}
int main(int argc, char* argv[]){
map<string, int> students;
students["建国"] = 12;
students["爱华"] = 11;
students["从从"] = 13;
students["丛丛"] = 11;
students["北京"] = 9;
cout<<"原map:"<<endl;
printMap(students);
students.erase("丛丛");
cout<<"删除 丛丛 后："<<endl;
printMap(students);
students.erase(std::begin(students));
cout<<"删除第一个元素后："<<endl;
printMap(students);
map<string,int>::iterator iter=students.find("建国");
students.erase(iter);
cout<<"删除建国后："<<endl;
printMap(students);
return 0;
}