advent_of_code_2022

commit 3cf14a15b169c945789620fac8d231682ef41680
parent d9a3b9fb9cab0c3c7c7c83fdc5556c66af337971
Author: Eamon Caddigan <eamon.caddigan@gmail.com>
Date:   Sat,  7 Jan 2023 17:45:57 -0800

Solution to day 23, part 2.

Maybe; it's untested because I'm on a plane. [Updating my commit message
to say that yes, it does indeed work ^_^]

Diffstat:
M
src/day_23.jl
 | 
19
+++++++++++++++++++

1 file changed, 19 insertions(+), 0 deletions(-)
diff --git a/src/day_23.jl b/src/day_23.jl
@@ -134,7 +134,26 @@ end
 @assert part_1(example) == 110
 @info part_1(input)
 
+function Base.:(==)(elves₁::Dict{Elf,Elf}, elves₂::ElfSet)
+    keys(elves₁) == elves₂
+end
+
+function Base.:(==)(elves₁::ElfSet, elves₂::Dict{Elf,Elf})
+    elves₁ == keys(elves₂)
+end
+
+function Base.:(==)(elves₁::Dict{Elf,Elf}, elves₂::Dict{Elf,Elf})
+    keys(elves₁) == keys(elves₂)
+end
+
 function part_2(input)
+    elves₁ = parse_input(input)
+    for ts = 0:1_000_000
+        elves₂ = moveelves(elves₁, ts)
+        elves₁ == elves₂ && return ts+1
+        elves₁ = elves₂
+    end
     nothing
 end
+@assert part_2(example) == 20
 @info part_2(input)