map用法

#include<iostream>
#include<string>
#include<map>
using namespace std;
int main()
{
	map<string,int>s;
	s.clear();
	string s1,s2,s3;
	cin>>s1>>s2>>s3;
	s[s1]++;
	s[s2]++;
	s[s3]++;
	cout<<s[s1]<<" "<<s[s2]<<" "<<s[s3]<<endl;
}
//运行结果： 
//i am student
//1 1 1