华为机试 - 求字符串中最大最小值

#include <iostream>
#include <map>
#include <string>
using namespace std;

int main()
{
map<char,int> strMap;
string str;
cin>>str;
for(size_t i=0;i<str.size();i++)
{
strMap[str[i]]++;
}
map<char,int>::iterator iterMap=strMap.begin();
if(iterMap->first==',')iterMap++;
int minNum=iterMap->first-'0';
int minCount=iterMap->second;
iterMap=strMap.end();
iterMap--;
int maxNum=iterMap->first-'0';
int maxCount=iterMap->second;
cout<<minNum<<' '<<maxNum<<' '<<str.size()-minCount-maxCount<<endl;
system("pause");
return 0;
}