Haskell, (削除) 17 (削除ここまで) 16(削除) 16 (削除ここまで) 15 bytes
o f(f!k)x=x=k(f x!).f
Almost feels like there's something smarter I could do. Almost.Try it online!
there was lol-1 thanks to Wheat Wizard repatterning the use of infix
Haskell, (削除) 17 (削除ここまで) 16 bytes
o f(!)x=(f x!).f
Almost feels like there's something smarter I could do. Almost.
there was lol