Help me in solving SHKNUM problem

help
,
1

My issue

only 30% passed with error RE(NZEC).

My code

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner s = new Scanner(System.in);
		 TreeSet<Long> sList = new TreeSet<Long>();
		    for(int x = 0; x <= 50; x++){
		        for(int y = 0; y <= 50; y++){
		            if(x!= y){
		               long l = (long) Math.pow(2,x) +(long) Math.pow(2,y);
		               sList.add(l);
		            }
		        }
		    }
		
		
		int T = s.nextInt();
		for(int testCase = 0; testCase < T; testCase++){
		    long n=s.nextLong();
		   
		    if(sList.contains(n)){
		        System.out.println(0);
		    }else{
		    long prev = sList.lower(n);
		    //prev = sList.lower(prev);
		    long next = sList.higher(n);
		    System.out.println(Math.min(Math.abs(n-prev),Math.abs(next-n)));
		    }
		}
	}
}

Problem Link: SHKNUM Problem - CodeChef