A Simple Minus

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Points: 10
Time limit: 0.2s
Memory limit: 2M

Author:
Problem type
Allowed languages
Assembly, NASM, NASM64

Your computer engineering instructor decided to ramp things up a bit (in terms of difficulty, of course) with this next task:

Write a program to find the maximum difference between the XOR of adjacent elements of a given array.

More formally,

Given an array A, find the maximum value of (A[i] \oplus A[i+1])-(A[j] \oplus A[j+1]) for some i and j, where i \neq j.

Unimpressed by the supposed "challenge", you open up your favourite text editor and begin typing away... in assembly.

Input Specification

The first line of input will contain a single integer N\ (3 \le N \le 100).

The second line of input will contain N space-separated integers in the range [-10^3,10^3], denoting the contents of array A.

Output Specification

The desired integer value as defined by your teacher on a line by itself.

Sample Input

3
3 2 1

Sample Output

2

Explanation

We can find the maximum value when i=2 and j=1:

=(A[2] \oplus A[3])-(A[1] \oplus A[2])

=(2 \oplus 1)-(3 \oplus 2)

=2

Note

To use libc in NASM, the first line of your program should be ; libc. For all others, it should be ; features: libc.


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