POJCow Multiplication（水题）

Posted 2020-10-31 som_nico

Cow Multiplication

http://poj.org/problem?id=3673

题意：输入两个数A B，比如123和45   然后算123*45这个运算是指1*4 + 1*5 + 2*4 + 2*5 + 3*4 + 3*5 = 54.

思路：水题。

#include<iostream>
#include<cmath>
#include<cstring>
using namespace std;
typedef long long ll;
const int inf = 0x3f3f3f3f;
int main()
{

    char a[20], b[20];
    cin >> a >> b;
    int i, j, sum = 0, la, lb;
    la = strlen(a);
    lb = strlen(b);
    for(i = 0; i < la; i++)
    {
        for(j = 0; j < lb; j++)
        {
            sum += ((a[i] - ‘0‘) * (b[j] - ‘0‘));
        }
    }
    cout << sum << endl;


    return 0;
}