题解 | #特殊乘法#

#include<cstdio>
#include<string>

using namespace std ;

int main (){
    char arr[100];
    char buf[100];
     scanf ("%s %s",arr,buf);
    string var = arr ;
    string str = buf ;
    int mux = 0 ;
    for (unsigned i = 0 ; i < var.size(); ++ i ){
        for (unsigned j = 0 ; j < str.size() ; ++ j ){
            mux = mux + (var[i]-'0') * (str [j]-'0') ;
        }
    }
    printf("%d",mux);
}