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23_safe_cracking.py
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#################################
# --- Day 23: Safe Cracking --- #
#################################
import AOCUtils
from math import factorial
class VM:
def __init__(self, program):
self.program = program[:]
self.pc = 0
self.registers = {"a": 0, "b": 0, "c": 0, "d": 0}
self.toggled = set()
self.toggledProgram = [cmd.split() for cmd in program]
for i in range(len(self.toggledProgram)):
if len(self.toggledProgram[i]) == 2: # one-argument instruction
if self.toggledProgram[i][0] == "inc":
self.toggledProgram[i][0] = "dec"
else:
self.toggledProgram[i][0] = "inc"
else: # two-argument instruction
if self.toggledProgram[i][0] == "jnz":
self.toggledProgram[i][0] = "cpy"
else:
self.toggledProgram[i][0] = "jnz"
self.toggledProgram = [" ".join(cmd) for cmd in self.toggledProgram]
def run(self):
while self.pc < len(self.program):
if self.pc in self.toggled:
cmd = self.toggledProgram[self.pc].split()
else:
cmd = self.program[self.pc].split()
inst = cmd[0]
x = cmd[1]
xVal = int(x) if not x.isalpha() else self.registers[x]
if len(cmd) > 2:
y = cmd[2]
yVal = int(y) if not y.isalpha() else self.registers[y]
if inst == "cpy":
if y.isalpha():
self.registers[y] = xVal
elif inst == "inc":
if x.isalpha():
self.registers[x] += 1
elif inst == "dec":
if x.isalpha():
self.registers[x] -= 1
elif inst == "jnz":
if xVal != 0:
self.pc += yVal - 1
elif inst == "tgl":
n = self.pc + xVal
if 0 <= n < len(self.program):
if n in self.toggled:
self.toggled.remove(n)
else:
self.toggled.add(n)
self.pc += 1
#################################
program = AOCUtils.loadInput(23)
# vm = VM(program)
# vm.registers["a"] = 7
# vm.run()
# print("Part 1: {}".format(vm.registers["a"]))
# vm = VM(program)
# vm.registers["a"] = 12
# vm.run()
# print("Part 2: {}".format(vm.registers["a"]))
X = int(program[19].split()[1])
Y = int(program[20].split()[1])
a = factorial(7) + X * Y
print("Part 1: {}".format(a))
a = factorial(12) + X * Y
print("Part 2: {}".format(a))
AOCUtils.printTimeTaken()
'''
0 | cpy a b | jnz a b | b = 12 | |
1 | dec b | inc b | b -= 1 | b -= 1 |
2 | cpy a d | jnz a d | d = b <<<<<<<<<<<<<<<<<<< | d = b | d = 11*12, 10*11*12, ...
3 | cpy 0 a | jnz 0 a | a = 0 ^ | a = 0 |
4 | cpy b c | jnz b c | c = b <<<<<<<<<<<<<<< ^ | c = b | c = 11, 10, 9, ...
| | | ^ ^ | |
5 | inc a | dec a | a += 1 <<<<<<<<<<< ^ ^ | a += c * d | 11*12, 10*11*12, 9*10*11*12, ...
6 | dec c | inc c | c -= 1 ^ ^ ^ | |
7 | jnz c -2 | cpy c -2 | while c != 0: >>>> ^ ^ | |
| | | ^ ^ | |
8 | dec d | inc d | d -= 1 ^ ^ | |
9 | jnz d -5 | cpy d -5 | while d != 0: >>>>>>> ^ | |
| | | ^ | |
10 | dec b | inc b | b -= 1 ^ | b -= 1 | b = 10, 9, 8, ...
11 | cpy b c | jnz b c | c = b ^ | |
12 | cpy c d | jnz c d | d = b ^ | |
| | | ^ | |
13 | dec d | inc d | d -= 1 <<<<<<<<<<< ^ | c = 2*b | c = 20, 18, 16, ...
14 | inc c | dec c | c += 1 ^ ^ | |
15 | jnz d -2 | cpy d -2 | while d != 0: >>>> ^ | |
| | | ^ | |
16 | tgl c | inc c | tgl c ^ | tgld | c += 1 | toggles all inst below on even offsets
17 | cpy -16 c | jnz -16 c | c = -16 ^ | c = -16 |
| | | ^ | |
18 | jnz 1 c | cpy 1 c | >>>>.. / c = 1 ..>>>>>>> | tgld |
| | | |
| | | | After calculating a!, c becomes 0 and inst 16
| | | | toggles itself, thus exiting the loop and
| | | | running the (modified/toggled) code below
| | | |
19 | cpy 75 c | jnz 75 c | c = 75 | c = 75 | c = 75
| | | | |
20 | jnz 97 d | cpy 97 d | >>...? / d = 97 <<<<< | tgld | d = 97
| | | ^ | |
21 | inc a | dec a | a += 1 <<<<<<<<<<< ^ | | a += c * d
22 | inc d | dec d | d += 1 / d -= 1 ^ ^ | tgld |
23 | jnz d -2 | cpy d -2 | while d != 0: >>>> ^ | |
| | | ^ | |
24 | inc c | dec c | c += 1 / c -= 1 ^ | tgld |
25 | jnz c -5 | cpy c -5 | while c != 0: >>>>>>> | |
'''