rt 源码如下

#include<iostream>
#include<cstring>
using namespace std;
int main()
{
	string num;
	getline(cin,num);
	if(num.length()%3==1)num="00"+num;
	else if(num.length()%3==2)num="0"+num;
	int ans=0;
	for(int i=0;i<num.length();i+=3)
	{
		ans*=10;
		ans+=int(num[i]-'0')*4+int(num[i+1]-'0')*2+int(num[i+2]-'0');
	}
	cout<<ans;
	return 0;
}