Day 19 solution

Cribbed heavily from https://www.reddit.com/r/adventofcode/comments/rjpf7f/comment/hp5k554/?utm_source=share&utm_medium=web2x&context=3 because this problem breaks my brain in so many ways. I understand the approach, but I got twisted up in my own head trying to write down the solution, so instead I started from a working copy and optimized it (a little bit) to make sure I understood what it was doing.

inputs/19.txt

@@ -0,0 +1,856 @@
+--- scanner 0 ---
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+
+--- scanner 1 ---
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+
+--- scanner 2 ---
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+
+--- scanner 3 ---
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+
+--- scanner 4 ---
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+
+--- scanner 5 ---
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+
+--- scanner 6 ---
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+--- scanner 7 ---
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+
+--- scanner 8 ---
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+--- scanner 9 ---
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+--- scanner 10 ---
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+--- scanner 11 ---
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+--- scanner 12 ---
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+--- scanner 13 ---
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+--- scanner 14 ---
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+--- scanner 15 ---
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+--- scanner 16 ---
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+--- scanner 17 ---
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+--- scanner 18 ---
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+--- scanner 19 ---
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+--- scanner 20 ---
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+--- scanner 21 ---
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+--- scanner 22 ---
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+--- scanner 23 ---
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+--- scanner 24 ---
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+--- scanner 25 ---
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+--- scanner 26 ---
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+--- scanner 27 ---
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+--- scanner 28 ---
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+--- scanner 29 ---
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+--- scanner 30 ---
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