1 files changed, 37 insertions, 0 deletions
diff --git a/2019/two.nim b/2019/two.nim
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+# Day Two: 1202 Program Alarm
+import os, strutils, sequtils
+
+let input: string = paramStr(1)
+var program: seq[int] = map(split(strip(readFile(input)), ','), parseInt)
+program[1] = 12
+program[2] = 2
+
+proc execute(program: seq[int]): int =
+  var program: seq[int] = program
+  var i: int = 0
+  while i < len(program):
+    case program[i]
+    of 1:
+      program[program[i+3]] = program[program[i+1]] + program[program[i+2]]
+      i += 4
+    of 2:
+      program[program[i+3]] = program[program[i+1]] * program[program[i+2]]
+      i += 4
+    of 99:
+      break
+    else:
+      echo("Unsupported code ", program[i], " at ", i)
+      quit(QuitFailure)
+  return program[0]
+
+proc grammar(program: seq[int]): int =
+  var program: seq[int] = program
+  for noun in 0 ..< len(program):
+    for verb in 0 ..< len(program):
+      program[1] = noun
+      program[2] = verb
+      if execute(program) == 19690720:
+        return 100 * noun + verb
+
+echo execute(program)
+echo grammar(program)