Wierd output

[KRUNCH]

Hi , i got a task , that was for the olympiad of my country in informatics and i wanted to solve a few tasks , and i started with one , it was fairly easy to figure it out , and i easily coded it , and it works , its great , yeah but the fun ends anfte the enterd number is 88 or more than i got no output and i dont knw the reason so i would like to find it out but its allready 36 hours sice i started asking and searchy why the heck... so the input is a simple two line input
the number n
and the number m wich is 1 or 2.
my code looks like this

#include <fstream>
using namespace std;
int main()
{
    long int n,m,rj,l,x;
    bool used[n];
    ifstream in("koder.in");
    ofstream out("koder.out");
    in>>n;
    in>>m;
    for (int i=1;i<=n;i++)
    {used[i]=false;}
    
    
    switch (m){
    case 1:
    l=n%3;
    rj=n/2;
    l=1-l;
while (rj!=1)
{
      for (int j=2;j<=n;j+=2)
      {
       
       if (used[j]==true)
       {continue;}
       
           else
           {
               if(rj==1)
               {break;}
                  if(l==0)
                  {
                  rj-=1;
                  used[j]=true;
                  l=1;
                  }
                  else
                  {
                     l=0;
                     continue;
                  }
           }
      }
}
for (int j=2;j<=n;j+=2)
{
    if (used[j]==false)
    {out<<j<<endl;
    }
}
break;
case 2:
    l=n%3;
    rj=n/2;
    l=1-l;
while (rj!=1)
{
      for (int j=1;j<=n;j+=2)
      {
       
       if (used[j]==true)
       {continue;}
       
           else
           {
               if(rj==1)
               {break;}
                  if(l==1)
                  {
                  rj-=1;
                  used[j]=true;
                  l=0;
                  }
                  else
                  {
                     l=1;
                     continue;
                  }
           }
      }
}
for (int j=1;j<=n;j+=2)
{
    if (used[j]==false)
    {out<<j<<endl;
    }
}
break;
}
in.close();
out.close();
return 0;
}

I also tried it with vectors but no result from it either.I would appriciate youre help and thanks.