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() {
int a, b;
set<char>mySet;
char c;
while (cin >> c) { // 注意 while 处理多个 case
mySet.emplace(c);
}
cout<<mySet.size();
}
// 64 位输出请用 printf("%lld")