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 <unordered_set>
int main(int argc, char* argv[]){
std::string str;
std::cin >> str;
std::unordered_set<char> occ;
for(char c : str){
if(c >= 0 && c <= 127){
occ.insert(c);
}
}
std::cout << occ.size() << std::endl;
return 0;
}
