题解 | 字符个数统计

//
// Created by gs on 2026/3/4.
//


// HJ10 字符个数统计

#include <stdio.h>
#include <string.h>

int main() {
    char buf[505];
    int count[130] = {0};
    int len = 0;
    fgets(buf, sizeof (buf), stdin);

    len = strlen(buf);
    if (buf[len - 1] == '\n') {
        buf[len - 1] = '\0';
    }
    len = strlen(buf);
    for (int i = 0; i < len; i++) {
        count[buf[i]] = 1;
    }

    int num = 0;
    for (int i = 0; i < 130; i++) {
        if (count[i] == 1) {
            num++;
        }
    }

    printf("%d\n", num);


    return 0;
}