Submission

Score: 20

User: ratitum091102

Problemset: เลขหลักของผลคูณ

Language: c

Time: 0.002 second

Submitted On: 2025-09-23 12:18:58

#include <stdio.h>
int main(){
    long long int a;
    long long int b;
    long long int c;
    scanf("%lld",&a);
    scanf("%lld",&b);
    scanf("%lld",&c);
    long long int d[100];
    for(int i = 1;i<=100;i=i+1){
        d[i] = 555;
    }
    d[1] = a*b%10;
    d[2] = a*b%100/10;
    d[3] = a*b%1000/100;
    d[4] = a*b%10000/1000;
    d[5] = a*b%100000/10000;
    d[6] = a*b%1000000/100000;
    d[7] = a*b%10000000/1000000;
    d[8] = a*b%100000000/10000000;
    d[9] = a*b%1000000000/100000000;
    d[10] = a*b%10000000000/1000000000;
    d[11] = a*b%100000000000/10000000000;
    d[12] = a*b%1000000000000/100000000000;
    if(d[c]!=555){
        printf("%lld",d[c]);
    }
    else{
        printf("_");
    }
}