90pts求改正

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,day=0,ans=0;
    cin>>n;
    vector<int> a(n);
    for (int i=0;i<a.size();i++)
    {
        a[i]=i+1;
    }
    while(a.size()>0)
    {
        day++;
        vector<int> b;
        for (int i=0;i<a.size();i++)
        {
            if (i%3==0)
            {
                if (a[i]==n)
                {
                    ans=day;
                }
            }
            else
            {
                b.push_back(a[i]);
            }
        }
        a=b;
    }
    cout<<day<<" "<<ans;
	return 0;
}