题解 |13行代码解决 #提取不重复的整数#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <set>
using namespace std;
set<char> c;
char ad;
int main()
{
while (scanf("%c",&ad)!=EOF)
{
c.insert(ad);
}
cout<<c.size()-1;
} 
