题解 | #字符个数统计#

#include <iostream>
#include <string>
#include <set>
using namespace std;

int main() {
    string str;
    getline(cin, str);
    
    set<char> chars;
    for(char c : str) {
        if((unsigned char)c <= 127) {  // 检查ASCII范围
            chars.insert(c);
        }
    }
    
    cout << chars.size() << endl;
    return 0;
}

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        
        HashSet<Character> chars = new HashSet<>();
        for(char c : str.toCharArray()) {
            if(c <= 127) {  // 检查ASCII范围
                chars.add(c);
            }
        }
        
        System.out.println(chars.size());
    }
}

s = input()
chars = set()

for c in s:
    # ord()函数返回字符的ASCII值
    if ord(c) <= 127:
        chars.add(c)

print(len(chars))