1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#!/usr/bin/env python
with open('day23.txt') as data:
program = [tuple(line.strip().replace(',', '').split()) for line in data]
def execute_program(insts, a_reg = 0):
registers = {
'a': a_reg,
'b': 0,
'pc': 0
}
def exec_inst(inst):
match inst:
case 'hlf', reg:
registers[reg] /= 2
registers['pc'] += 1
case 'tpl', reg:
registers[reg] *= 3
registers['pc'] += 1
case 'inc', reg:
registers[reg] += 1
registers['pc'] += 1
case 'jmp', offset:
registers['pc'] += int(offset)
case 'jie', reg, offset:
if registers[reg] % 2 == 0:
registers['pc'] += int(offset)
else:
registers['pc'] += 1
case 'jio', reg, offset:
if registers[reg] == 1:
registers['pc'] += int(offset)
else:
registers['pc'] += 1
while True:
exec_inst(insts[registers['pc']])
if registers['pc'] >= len(insts):
print(registers['b'])
break
# part 1
execute_program(program, 0)
# part 2
execute_program(program, 1)
|