C++ 代码 纯仿照人类

#include <iostream>
#include <cstdio>
#include <vector>

using namespace std;

vector<int> multiple(vector<int> a,vector<int>b){
    vector<int> r;
    r.resize(a.size()+b.size());
    int i,j,jw;
    for(j=0;j<b.size();j++){
        for(i=0,jw=0;i<a.size();i++){
            int s=b[j]*a[i]+jw+r[i+j];
            int bw=s%10;
            jw=s/10;
            r[i+j]=bw;

        }
        r[i+j]=jw;

    }

    while(r.size()>1 && r.back()==0) r.pop_back();
    return r;



}

int main(){
   string a,b;
   cin>>a>>b;
   vector<int> va,vb,vr;
   for(int i=a.length()-1;i>=0;i--) va.push_back(a[i]-'0');
   for(int i=b.length()-1;i>=0;i--) vb.push_back(b[i]-'0');


   vr=multiple(va,vb);
   for(int i=vr.size()-1;i>=0;i--) printf("%d",vr[i]);

    return 0;
}