Next_Permutation with AND

#include <bits/stdc++.h>
using namespace std;
bool isPowerOfTwo(int n)
{
   if(n==0)
   return false;
   return ((n & (n-1))==0);
}
 
int main(){
    int t,flag=false;
    cin>>t;
    while(t--)
    {
    long long n;
    cin>>n;
    if(n==1)
    cout<<"1"<<endl;
    else if(isPowerOfTwo(n))
    cout<<-1<<endl;
    else if(n==3)
    cout<<1<<" "<<3<<" "<<2<<endl;
    else if(n==5)
    cout<<2<<" "<<3<<" "<<1<<" "<<5<<" "<<4<<endl;
    else
    {
    cout<<2<<" "<<3<<" "<<1<<" "<<5<<" "<<4<<endl;
    int k=6;
    while(k<=n)
    {
        if(isPowerOfTwo(k))
        {
            cout<<k+1<<" "<<k<<" ";
            k+=2;
        }
        else
        {
            cout<<k<<" ";
            k++;
        }
    }
    cout<<endl;
    }
    }
    return 0;
}