题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include<bits/stdc++.h>
using namespace std;
int main(){
string str;
cin>>str;
map<char,int> m;
for(int i=0;i<str.size();++i){
if(m.find(str[i])==m.end())
m[str[i]]=1;
else
m[str[i]]+=1;
}
cout<<m.size();
return 0;
}
