Dyalog APL, 89 bytes
{1∊∘∊¨⍷¨∘⍵¨⍬{0∊⍴⍵:⍺⋄(⍺,⊂A)∇⍵~A←(⌽¨,⊢)(⊖¨,⊢)(⍉¨,⊢)⊣/⍵}(e⍤⍉e←{⍵/⍨×+⌿⍵})¨4 4∘⍴¨,⌿2⊥⍣¯1⍳2*16}
Requires IO to be zero.
Thanks Adám for -8 bytes!
Ungolfed version:
{
remove...
posted 2y ago
by RubenVerg
· edited
2y ago
by RubenVerg
Answer