题解 | #特殊乘法#

#include <stdio.h>

#define N 12
int a[N];
int b[N];

int main() {
    int x, y;
    while(scanf("%d%d",&x,&y) != EOF){
        int i = 0;
        int j = 0;
        int cnt = 0;
        while(x != 0){
            a[i ++] = x % 10;
            x /= 10; 
        }
        while(y != 0){
            b[j ++] = y % 10;
            y /= 10;
        }
        for(int k = 0;k < i;k ++){
            for(int l = 0;l < j;l ++){
                cnt += a[k] * b[l];
            }
        }
        printf("%d\n",cnt);
    }
    return 0;
}