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| ⍝ Blatantly plagiated from @rak1507 | |
| data←↑⍎¨¨⊃⎕NGET'../d/9'1 | |
| shifts←{(⍺,2⊣/⍵)(2⊢/⍵,⍺)(2⊢⌿⍵⍪⍺)(⍺⍪2⊣⌿⍵)} | |
| lowpoints←data<⊃⌊/10 shifts data | |
| +/1+data[⍸lowpoints] ⍝ part 1 | |
| fill←{(×⍵)×⍵⌈⊃⌈/0 shifts ⍵}⍣≡{(2+⍳+/,⍵)@⊢⍵}9≠data | |
| ×/3↑{⍵[⍒⍵]}⊢∘≢⌸(∊fill)~0 ⍝ part 2 |
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