Day 23

23.py

@@ -0,0 +1,25 @@
+import re
+
+
+def set_register(r, v):
+    global registers
+    registers[r] = v
+
+registers = {'a': 1, 'b': 0, 'pc': 0}
+program = [re.split(',? ', line) for line in open('23.txt', 'r').read().splitlines()]
+instructions = {
+    'hlf': lambda args: set_register(args[0], registers[args[0]] / 2),
+    'tpl': lambda args: set_register(args[0], registers[args[0]] * 3),
+    'inc': lambda args: set_register(args[0], registers[args[0]] + 1),
+    'jmp': lambda args: set_register('pc', registers['pc'] + (int(args[0]) - 1)),
+    'jie': lambda args: set_register('pc', registers['pc'] + (int(args[1]) - 1 if registers[args[0]] % 2 == 0 else 0)),
+    'jio': lambda args: set_register('pc', registers['pc'] + (int(args[1]) - 1 if registers[args[0]] == 1 else 0))
+}
+
+try:
+    while True:
+        line = program[registers['pc']]
+        instructions[line[0]](line[1:])
+        registers['pc'] += 1
+except LookupError:
+    print(registers['b'])

23.txt

@@ -0,0 +1,46 @@
+jio a, +16
+inc a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+jmp +23
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl 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