poj3673

//poj3673 自定义乘法 考察string 水#include <iostream>#include <string>using namespace std;int main(){string a, b;getline(cin, a, ' ');getline(cin, b);long long total = 0;for(int i = 0; i < a.length(); i++){for(int j = 0; j < b.length(); j++)total += (a[i] - '0') * (b[j] - '0');}cout<<total<<endl;return 0;}