poj3673

水题

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
using namespace std;

int main()
{
	//freopen("D:\\t.txt", "r", stdin);
	string a, b;
	cin >> a >> b;
	int ans = 0;
	for (int i = 0; i < a.length(); i++)
		for (int j = 0; j < b.length(); j++)
			ans += (a[i] - '0') * (b[j] - '0');
	printf("%d\n", ans);
	return 0;
}