高精度*低精度

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    string x;
    cin>>x>>n;
    vector<int> a;
    for(int i = x.size()-1;i>=0;i--){
        a.push_back(x[i]-'0');
    }
    int j = 0;
    for(int i = 0;i<a.size() || j;i++){
        if(i>=a.size()){
            a.push_back(0);
        }
        j += a[i]*n;
        a[i] = j%10;
        j /= 10;
    }
    for(int i = a.size()-1;i>=0;i--){
        cout<<a[i];
    }
    return 0;
}