Doubt in a codeforce question

#1

https://codeforces.com/contest/1299/problem/A

//above is the link

Please help me with the Logic.

#2

@keshari,
Just read its editorial, it is explained well enough there.
Basically for any ith element, swap it with a[1], then F(a)=a[1]&(~a[2])&(~a[3])…&(~a[n])
where ~ means compliment.
So. do the for each ‘i’ and print the max found.

#3

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