利用键值对统计单词出现的次数

#include <iostream>
#include <string>
#include <vector>
#include <map>	//使用关联式容器map<键，值> m

using namespace std;

void main()
{
string s;
map<string,int> counters;

while (cin>>s)
{
++counters[s];	//增加每个单词出现的次数
}

for (map<string,int>::const_iterator iter = counters.begin(); iter != counters.end(); ++iter)
{
cout<<(*iter).first<<'\t'<<iter->second<<endl;
}

}