Initial commit

2022/day12/day12.bqn

@@ -0,0 +1,33 @@
+map←>•FLines⊑•args
+IndexOf←{<˘⍉>⌊(≠⊏𝕨)(÷˜⋈|)/⥊𝕨=𝕩}
+s‿e←⊑¨map⊸IndexOf¨"SE"
+h←-⟜'a'¨'z'⌾(e⊸⊑)'a'⌾(s⊸⊑)map
+
+_fixedpoint←{𝔽∘⊢⍟≢⟜𝔽_𝕣∘⊢⍟≢⟜𝔽𝕩}
+
+Dijkstra←{h𝕊s:
+    vis←(≢h)⥊0
+    dist←0⌾(s⊸⊑)(≢h)⥊∞
+    Neighbors←{𝕊n:
+        ns←n⊸+¨∾(-⋈⊢)¨(⌽⋈⊢)0‿1
+        ns ((∧´¨(≢vis)⊸>¨)/⊢)↩ # inside the grid
+        ns ((∧´¨0⊸≤¨)/⊢)↩ # inside the grid
+        ns↩({¬𝕩⊑vis}¨ns)/ns # unvisited
+        (1≥({𝕩⊑h}¨ns)-n⊑h)/ns # reachable height
+    }
+    Visit←{
+        ∧´⥊𝕩 ? 𝕩;
+	nexts←((≢dist)⥊(¬⥊𝕩)) IndexOf 1
+	nexts↩(⍋{𝕩⊑dist}¨nexts)⊏nexts
+        n←⊑nexts
+        {dist (1+n⊑dist)⊸⌊⌾(𝕩⊸⊑)↩}¨Neighbors n # update distances
+        ¬⌾(n⊸⊑)𝕩 # mark node as visited
+    }
+    Visit _fixedpoint vis
+    dist
+}
+
+•Show e⊑h Dijkstra s
+
+ss←map IndexOf'a'
+•Show ⌊´ss⊑(-h)Dijkstra e

2022/day12/input

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2022/day12/test

@@ -0,0 +1,5 @@
+Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi