Submission

Score: 100

User: peilin

Problemset: ตัวอักษรตัวแรกในคำ

Language: c

Time: 0.002 second

Submitted On: 2025-10-12 13:26:57

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

int main() {
    char w[21], c[256] = {};
    scanf("%s", w);
    for (int i = 0; w[i]; i++) c[(unsigned char)w[i]]++;
    char m = 127;
    for (int i = 0; w[i]; i++)
        if (c[(unsigned char)w[i]] == 1 && w[i] < m) m = w[i];
    if (m != 127) printf("%c\n", m);
    return 0;
}