From 568b7cde7290a8ae2d5cbcae6a2c6f4044b62214 Mon Sep 17 00:00:00 2001
From: j-james
Date: Wed, 30 Nov 2022 01:06:09 -0800
Subject: Day Nineteen, Part I (2020)

---
 2020/input/nineteen.txt | 583 ++++++++++++++++++++++++++++++++++++++++++++++++
 2020/nineteen.nim       |  41 ++++
 2 files changed, 624 insertions(+)
 create mode 100644 2020/input/nineteen.txt
 create mode 100644 2020/nineteen.nim

(limited to '2020')

diff --git a/2020/input/nineteen.txt b/2020/input/nineteen.txt
new file mode 100644
index 0000000..b3d35c9
--- /dev/null
+++ b/2020/input/nineteen.txt
@@ -0,0 +1,583 @@
+26: 97 126 | 123 57
+122: 84 97 | 92 123
+82: 97 138 | 123 130
+80: 131 97
+3: 123 107 | 97 66
+101: 1 123 | 95 97
+10: 97 138 | 123 107
+83: 123 27 | 97 12
+54: 97 126 | 123 107
+61: 97 50 | 123 114
+123: "a"
+86: 123 18 | 97 36
+70: 97 76 | 123 69
+34: 66 97 | 110 123
+68: 97 93 | 123 86
+131: 123 97 | 97 123
+126: 97 97 | 97 123
+93: 59 97 | 9 123
+51: 78 21
+94: 97 90 | 123 39
+49: 88 97 | 66 123
+104: 75 97 | 33 123
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+45: 123 13 | 97 62
+36: 123 81 | 97 65
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+15: 123 2 | 97 49
+85: 130 78
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+66: 78 97 | 123 123
+76: 123 45 | 97 55
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+20: 97 107 | 123 13
+38: 97 110
+16: 110 123 | 130 97
+97: "b"
+117: 13 97 | 66 123
+19: 123 138 | 97 131
+106: 123 35 | 97 13
+59: 97 5 | 123 74
+7: 97 21 | 123 66
+35: 97 123 | 123 78
+0: 8 11
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+95: 123 13 | 97 138
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+96: 123 43 | 97 52
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+50: 123 7 | 97 26
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+52: 97 130 | 123 126
+63: 123 77 | 97 127
+64: 97 118 | 123 88
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+4: 57 97 | 131 123
+77: 123 104 | 97 83
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diff --git a/2020/nineteen.nim b/2020/nineteen.nim
new file mode 100644
index 0000000..1f815b4
--- /dev/null
+++ b/2020/nineteen.nim
@@ -0,0 +1,41 @@
+# Day Nineteen: Monster Messages
+import std/[os, strutils, sequtils, sugar, algorithm]
+
+let input = paramStr(1).readFile().strip().split("\n\n")
+let rules: seq[string] = input[0].strip().split("\n")
+  .sortedByIt(it.split(": ")[0].parseInt()).mapIt(it.split(": ")[1])
+
+let messages: seq[string] = input[1].strip().split("\n")
+
+func replace(a: string, target: int, with: string): string =
+  var replaced = false
+  for chunk in a.split(" "):
+    if chunk[0] != '"' and chunk.parseInt() == target and not replaced:
+      result &= with # probably the bug
+      replaced = true
+    else:
+      result &= chunk
+    result &= " "
+  result.strip()
+
+var stack: seq[string]
+var generated: seq[string]
+stack.add(rules[0])
+while stack.len > 0: # slow as all hell... but works!
+  var current = stack.pop
+  if not current.contains({'0'..'9'}):
+    generated.add(current)
+  else:
+    var nextindex = current.split(" ")
+      .filterIt(it[0] != '"')[0].parseInt()
+    var nextrule = rules[nextindex]
+    for chunk in nextrule.split(" | "):
+      stack.add(current.replace(nextindex, chunk))
+
+generated.applyIt(it.replace("\"", "").replace(" ", ""))
+
+var sum = 0
+for line in messages:
+  if line in generated:
+    inc sum
+echo sum
-- 
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