题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream>
#include <string>
#include <set>
using namespace std;
int main() {
string str;
cin >> str;
set<char> set1;
for (auto c:str) {
if (c != '\0') {
set1.insert(c);
}
}
cout << set1.size() << endl;
}
// 64 位输出请用 printf("%lld")
