Solutions to day 23.

day-23/input.txt

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+jio a, +19
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+jmp +23
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+jio a, +8
+inc b
+jie a, +4
+tpl a
+inc a
+jmp +2
+hlf a
+jmp -7

day-23/solution.py

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+from __future__ import division, print_function
+import fileinput
+import re
+
+def run(instructions, registers):
+    instrptr = 0
+    while instrptr < len(instructions):
+        instruction = instructions[instrptr]
+        if "j" in instruction[0]:
+            if instruction[0] == "jie":
+                doJump = registers[instruction[1]] % 2 == 0
+            elif instruction[0] == "jio":
+                doJump = registers[instruction[1]] == 1
+            else:
+                doJump = True
+
+            if doJump:
+                instrptr = instrptr + int(instruction[-1])
+            else:
+                instrptr += 1
+
+            continue
+
+        if instruction[0] == "hlf":
+            registers[instruction[1]] //= 2
+        elif instruction[0] == "tpl":
+            registers[instruction[1]] *= 3
+        else:
+            registers[instruction[1]] += 1
+
+        instrptr += 1
+
+    return registers
+
+registers = {
+        'a': 0,
+        'b': 0,
+        }
+
+instructions = []
+
+for line in fileinput.input():
+    instructions.append(tuple(x.strip() for x in re.match(r"(hlf|tpl|inc|jmp|jie|jio) (a|b)?,? ?(\+?-?[0-9]+)?", line).groups() if x is not None))
+
+
+
+print(run(instructions, {'a': 0, 'b': 0})['b'])
+print(run(instructions, {'a': 1, 'b': 0})['b'])
+