Submission

Score: 70

User: Chawin

Problemset: เลขหลักของผลคูณ

Language: c

Time: 0.002 second

Submitted On: 2025-10-08 05:05:52

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

int main() {
    int a, b, x;
    scanf("%d %d %d", &a, &b, &x);

    int n = a * b, i = 0;
    char ab[100001];

    while (n > 0) {
        ab[i++] = (n % 10) + '0';
        n /= 10;
    }
    ab[i] = '\0';  

    int r = 1;
    int len = strlen(ab);

    for (int i = len - 1; i >= 0; i--) {
        if (r == x) {
            printf("%c\n", ab[i]);
            return 0;
        }
        r++;
    }

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