For this Question: You are given an array A of N integers. Determine the minimum value of the following expression for all i, j valid : (A<sub>i</sub> and A<sub>j</sub>) xor (A<sub>i</sub> or A<sub>j</sub>), where i &ne; j.First line: A single integer T denoting the number of test cases
For each test case:
<ul style="list- style- type:disc"><li>First line contains a single integer N, denoting the size of the array</li><li>Second line contains N space- separated integers A<sub>1</sub>, A<sub>2</sub>,. , A<sub>n</sub></li></ul>
<b>Constraints</b>
1 &le; T &le; 10<sup>3</sup>
1 &le; N &le; 10<sup>5</sup>
0 &le; A<sub>i</sub> &le; 10<sup>9</sup>
Note: Sum of N overall test cases does not exceed 10<sup>6</sup>For each test case, print a single line containing one integer that represents the minimum value of the given expressionSample Input
2
5
1 2 3 4 5
3
2 4 7
Sample Output
1
3
Explanation
For test case #1, we can select elements 2 and 3, the value of the expression is (2 and 3) xor (2 or 3) = 1, which is the minimum possible value. Another possible pair is 4 and 5.
For test case #2, we can select elements 4 and 7, the value of the expression is (4 and 7) xor (4 or 7) = 3, which is the minimum possible value., I have written this Solution Code: import java.util.*;
import java.io.DataInputStream; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.Scanner; 
import java.util.StringTokenizer; 
 
public class Main
{
 
static class Reader 
    { 
        final private int BUFFER_SIZE = 1 << 16; 
        private DataInputStream din; 
        private byte[] buffer; 
        private int bufferPointer, bytesRead; 
  
        public Reader() 
        { 
            din = new DataInputStream(System.in); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public Reader(String file_name) throws IOException 
        { 
            din = new DataInputStream(new FileInputStream(file_name)); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public String readLine() throws IOException 
        { 
            byte[] buf = new byte[64]; // line length 
            int cnt = 0, c; 
            while ((c = read()) != -1) 
            { 
                if (c == '\n') 
                    break; 
                buf[cnt++] = (byte) c; 
            } 
            return new String(buf, 0, cnt); 
        } 
  
        public int nextInt() throws IOException 
        { 
            int ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do
            { 
                ret = ret * 10 + c - '0'; 
            }  while ((c = read()) >= '0' && c <= '9'); 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public long nextLong() throws IOException 
        { 
            long ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public double nextDouble() throws IOException 
        { 
            double ret = 0, div = 1; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
  
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
  
            if (c == '.') 
            { 
                while ((c = read()) >= '0' && c <= '9') 
                { 
                    ret += (c - '0') / (div *= 10); 
                } 
            } 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        private void fillBuffer() throws IOException 
        { 
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE); 
            if (bytesRead == -1) 
                buffer[0] = -1; 
        } 
  
        private byte read() throws IOException 
        { 
            if (bufferPointer == bytesRead) 
                fillBuffer(); 
            return buffer[bufferPointer++]; 
        } 
  
        public void close() throws IOException 
        { 
            if (din == null) 
                return; 
            din.close(); 
        } 
    }
 
    public static void main(String [] args) throws IOException
    {
	   Reader r  = new Reader();
 
		int t = r.nextInt();
		while(t-->0)
		{
			int n = r.nextInt();
			 int a[] = new int[n];
		
		   
			for(int i=0; i<n; i++)
				a[i] = r.nextInt();
		   
		 	Arrays.sort(a);
			
			int min =  Integer.MAX_VALUE;
			for(int i=0; i<n-1; i++)
				min = Math.min(min,(a[i] ^ a[i+1]));
			System.out.println(min);	
		}
	}
}, In this Programming Language: Java, Now tell me if this Code is compilable or not?