#include<stdio.h>
#include<stdlib.h>
struct node
{
struct node*p[2];
};
struct node *root=NULL,*t,*t1;
struct node *createnode()
{
t1=(struct node *)malloc(sizeof(struct node));
t1->p[0]=NULL;
t1->p[1]=NULL;
}
void insert(int k)
{
t=root;int i,b;
for(i=3;i>=0;i--)
{
b=(k>>i)&1;
if(t->p[b]==NULL)
{
t->p[b]=createnode();
}
t=t->p[b];
}
}
int maxxor(int k)
{
int res=0,i,b;
t=root;
for(i=3;i>=0;i--)
{
b=(k>>i)&1;
if(t->p[b^1]==NULL)
t=t->p[b];
else
{
res=res+(1<<i);
t=t->p[b^1];
}
}
return res;
}
int main()
{
int n,a[10],i,r,r1=-1;
root=createnode();
printf("Enter n value");
scanf("%d",&n);
printf("Enter %d integers",n);
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
insert(a[i]);
r=maxxor(a[i]);
if(r>r1)
r1=r;
//printf("%d ",r1);
}
// printf("Inserted");
printf("%d ",r1);
}
