Can anyone explain sample test? I have smth like this:
Case n = 4, k = 1:
0000
0000
0000
1111
Case n = 4, k = 2:
0000
0000
0001
0111
Case n = 4, k = 3:
0000
0000
0001
1011
Case n = 4, k = 4:
0000
0000
0001
1101
Case n = 4, k = 15:
0000
0000
0011
1100

Matrix should not overlap itself after 90-degree rotations (no two '1' at same position) and should cover all NxN elements after 4 such rotations.