Trying to map a 2d array into a disk

[Tomaspecl (Tomáš Pecl)]

The condition changes depending on if A < B or A > B. As I put it before:

bool a = A<=X;
bool b = X<=B;
return (a && b) || (A>B && (a || b));

which means (is equivalent to):

bool a = A<=X;
bool b = X<=B;
if(A<=B) {
    return a && b;
}else{
    return a || b;
}