View Code of Problem 86

#include<stdio.h>
int main()
{
	int a,n,i;
	scanf("%d%d",&a,&n);
	int A[n];
	for(i=0;i<n;i++)
    {
        if(i==0)
            A[i]=a;
        else
            A[i]=A[i-1]*10+a;
    }
    long int sum=0;
    for(i=0;i<n;i++)
        sum+=A[i];
    printf("%ld",sum);
	return 0;
}