题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <set>
using namespace std;
int main() {
string a;
cin >> a;
set<char> b;
for(int i=0;i<a.length();i++){
if(a[i]>=0 && a[i]<=127){
b.insert(a[i]);
}
}
cout << b.size() << endl;
}

