NYOJ - 另类乘法

另类乘法

描述

Bessie is tired of multiplying pairs of numbers the usual way, so she invented her own style of multiplication. In her style,A*B is equal to the sum of all possible pairwise products between the digits ofA and B. For example, the product 123*45 is equal to 1*4 + 1*5 + 2*4 + 2*5 + 3*4 + 3*5 = 54. Given two integers A and B (1 ≤ A, B ≤ 1,000,000,000), determine A*B in Bessie's style of multiplication.

输入

The first Line of the input is a positive integer T,indicates the number of the test cases;
In every case,the input is in one line,contains two positive interger A,B

输出

For every case,output the multiplication in Bessie's style.

样例输入

1
123 45

样例输出

54

#include <stdio.h>
int main()
{int a,b,n,s,i,j;scanf("%d",&n);while(n--){scanf("%d%d",&a,&b);s = 0;while(a){i = a % 10;int m = b;while(m){j = m % 10;s += i * j;m /= 10; }a /= 10;}printf("%d\n",s);}
}