map的相关代码如下：
#include <iostream>
#include <map>
using namespace std;
int main(int argc, char const *argv[]){
map<char, int> wordCntMap;
wordCntMap['c']++;
map<char, int>::iterator iter = wordCntMap.begin();
while(iter != wordCntMap.end()){
// iter->first iter->second
iter++;
}
return 0;
}