题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <iostream> #include <unordered_set> using namespace std; int main() { string str; getline(cin, str); unordered_set<char> Set; int res = 0; for(int i = 0; i < str.length(); i++){ if(int(str[i]) >= 0 && int(str[i]) < 128 && Set.count(str[i]) == 0) res +=1; Set.insert(str[i]); } cout << res << endl; return 0; }