Submission

Score: 100

User: Dormon

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.003 second

Submitted On: 2025-09-19 18:31:43

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

int main()
{
    char input[20];
    scanf("%s", input);
    int n = strlen(input);
    int freq[26];
    memset(freq, 0, sizeof freq);
    for (int i = 0;i < n;i++)
        freq[input[i] - 'A']++;
    for (int i = 0;i < 26;i++){
        if (freq[i] == 1){
            printf("%c\n", 'A' + i);
            return 0;
        }
    }
}