#include<stdio.h>
int main()
{
int m, n;
int sum = 0;
int he = 0;
scanf("%d %d", &m, &n);
for (int i = 0; i < n; i++)
{
sum = sum * 10 + m;
he += sum;
}
printf("s = %d", he);
}原文：https://blog.51cto.com/14737345/2479861