Created
December 15, 2021 13:14
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AoC 2021, day 15, Dyalog APL
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| ⎕IO←0 | |
| 'wpath'⎕cy'dfns' | |
| d←↑⍎¨¨⊃⎕NGET'../d/15'1 | |
| shifts←{(⍺,2⊣/⍵)(2⊢/⍵,⍺)(2⊢⌿⍵⍪⍺)(⍺⍪2⊣⌿⍵)} | |
| day15←{ | |
| nnnn←{⍵~¯1}¨,↓2 0 1⍉↑¯1shifts(⍴⍵)⍴(⍳×/⍴⍵) | |
| flat←∊⍵ | |
| values←{flat[⍵]}¨nnnn | |
| graph←↑(nnnn)(values) | |
| path←graph wpath 0 (¯1+≢flat) | |
| +/1↓flat[path] | |
| } | |
| day15 d | |
| merge←{((⍴×⍴∘⊃)⍴0 2 1 3⍉↑)⍵} | |
| day15 9@(⍸0=9|mddd)⊢9|mddd←merge (5 5⍴⊂d)+∘.+⍨⍳5 |
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