Submission

Score: 30

User: peilin

Problemset: ตัวอักษรตัวแรกในคำ

Language: c

Time: 0.001 second

Submitted On: 2025-10-10 21:34:19

#include <stdio.h>

int main() {
    char s[101];
    int i, j, unique;

    scanf("%s", s);

    for(i = 0; s[i] != '\0'; i++) {
        unique = 1;
        for(j = 0; s[j] != '\0'; j++) {
            if(i != j && s[i] == s[j]) {
                unique = 0;
                break;
            }
        }
        if(unique) {
            printf("%c\n", s[i]);
            return 0;
        }
    }

    printf("_\n");
    return 0;
}