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authorAndreas Grois <andi@grois.info>2025-01-05 23:55:54 +0100
committerAndreas Grois <andi@grois.info>2025-01-05 23:55:54 +0100
commit4749b3ca572618fa1a7cdb17e2abba9b498279ca (patch)
tree7636d21bfe2a014e710b05771fe7ea844e67311f /Common/Countable.lean
parentbbf615a66d1814ff196313b206cd3bcc239079c1 (diff)
Move AStar into a separte library and use it for Day17-1
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-import Common.Finite
-
-class Countable (α : Type u) where
- enumerate : α → Nat
- injective {a b : α} : enumerate a = enumerate b → a = b
-
-instance {α : Type u} [Finite α] : Countable α where
- enumerate := Fin.val ∘ Finite.enumerate
- injective := Finite.injective ∘ Fin.val_inj.mp