Implementation
static const List<int> RAYS = [
17,
0,
0,
0,
0,
0,
0,
16,
0,
0,
0,
0,
0,
0,
15,
0,
0,
17,
0,
0,
0,
0,
0,
16,
0,
0,
0,
0,
0,
15,
0,
0,
0,
0,
17,
0,
0,
0,
0,
16,
0,
0,
0,
0,
15,
0,
0,
0,
0,
0,
0,
17,
0,
0,
0,
16,
0,
0,
0,
15,
0,
0,
0,
0,
0,
0,
0,
0,
17,
0,
0,
16,
0,
0,
15,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
17,
0,
16,
0,
15,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
17,
16,
15,
0,
0,
0,
0,
0,
0,
0,
1,
1,
1,
1,
1,
1,
1,
0,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
0,
0,
0,
0,
0,
0,
0,
-15,
-16,
-17,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
-15,
0,
-16,
0,
-17,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
-15,
0,
0,
-16,
0,
0,
-17,
0,
0,
0,
0,
0,
0,
0,
0,
-15,
0,
0,
0,
-16,
0,
0,
0,
-17,
0,
0,
0,
0,
0,
0,
-15,
0,
0,
0,
0,
-16,
0,
0,
0,
0,
-17,
0,
0,
0,
0,
-15,
0,
0,
0,
0,
0,
-16,
0,
0,
0,
0,
0,
-17,
0,
0,
-15,
0,
0,
0,
0,
0,
0,
-16,
0,
0,
0,
0,
0,
0,
-17
];