题解 | #特殊乘法#

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <string>
#include <stdlib.h>

using namespace std;

int main() {
	string str1, str2;
	while (cin >> str1 >> str2) {
		int answer = 0;
		//printf("str1 = %s\n", str1);
		//printf("str2 = %s\n", str2);
		for (int i = 0; i < str1.size(); ++i) {
			for (int j = 0; j < str2.size(); ++j) {
				answer += (str1[i] - '0') * (str2[j] - '0');
				//printf("str1[%d] - '0' = %d\n", i,str1[i] - '0');
				//printf("str2[%d] - '0' = %d\n", j,str2[j] - '0');
			}
		}
		
		printf("%d\n", answer);
	}
	system("pause");
	return EXIT_SUCCESS;
}
// 64 位输出请用 printf("%lld")