pair in array
import java.io.*;
import java.util.*;
public class Main
{
public static void main (String[]args)
{
int a[] = { 1,2,3,4,5,6};
int n = a.length;
int r = n-1;
for(int i=0;i<n;i++){
int l = i;
while(l<r){
System.out.print("("+a[l]+","+a[r] + ") ");
r--;
}
r=n-1;
}
}
}