Submission

Score: 100

User: Benjamin404

Problemset: ตัวอักษรตัวแรกในคำ

Language: c

Time: 0.003 second

Submitted On: 2025-09-22 20:48:33

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

int main() {
    char word[21];
    scanf("%20s", word);

    int freq[128] = {0};
    for (int i = 0; word[i] != '\0'; i++) {
        freq[(int)word[i]]++;
    }

    for (int i = 0; i < 128; i++) {
        if (freq[i] == 1) {
            printf("%c\n", i);
            break;
        }
    }

    return 0;
}