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day24.py
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day24.py
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SAMPLE_INPUT = [
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"inp w",
"mul z 31",
"add z w",
"mod z 16777216",
]
class ALU:
__slots__ = ("w", "x", "y", "z")
def __init__(self, w, x, y, z):
self.w, self.x, self.y, self.z = w, x, y, z
def copy(self):
return ALU(self.w, self.x, self.y, self.z)
def solve(lines, nums, prefix=0, alu=None):
if not alu:
alu = ALU(0, 0, 0, 0)
for i, line in enumerate(lines):
match line.split():
case "inp", lhs:
for x in nums:
setattr(alu, lhs, x)
if skip_range(lines[i + 1 :], alu.w, alu.x, alu.y, alu.z):
continue
r = solve(
lines[i + 1 :], nums, prefix=10 * prefix + x, alu=alu.copy()
)
if r is not None:
return r
return None
case "add", lhs, rhs:
setattr(
alu,
lhs,
getattr(alu, lhs)
+ (int(rhs) if rhs.lstrip("-").isnumeric() else getattr(alu, rhs)),
)
case "mul", lhs, rhs:
setattr(
alu,
lhs,
getattr(alu, lhs)
* (int(rhs) if rhs.lstrip("-").isnumeric() else getattr(alu, rhs)),
)
case "div", lhs, rhs:
setattr(
alu,
lhs,
getattr(alu, lhs)
// (int(rhs) if rhs.lstrip("-").isnumeric() else getattr(alu, rhs)),
)
case "mod", lhs, rhs:
setattr(
alu,
lhs,
getattr(alu, lhs)
% (int(rhs) if rhs.lstrip("-").isnumeric() else getattr(alu, rhs)),
)
case "eql", lhs, rhs:
setattr(
alu,
lhs,
int(
getattr(alu, lhs)
== (
int(rhs)
if rhs.lstrip("-").isnumeric()
else getattr(alu, rhs)
)
),
)
return None if alu.z else prefix
def skip_range(lines, w, x, y, z):
alu = ALU((w, w), (x, x), (y, y), (z, z))
for line in lines:
match line.split():
case "inp", lhs:
setattr(alu, lhs, (1, 9))
case "add", lhs, rhs:
a, b = getattr(alu, lhs)
c, d = (
(int(rhs), int(rhs))
if rhs.lstrip("-").isnumeric()
else getattr(alu, rhs)
)
setattr(alu, lhs, (a + c, b + d))
case "mul", lhs, rhs:
a, b = getattr(alu, lhs)
c, d = (
(int(rhs), int(rhs))
if rhs.lstrip("-").isnumeric()
else getattr(alu, rhs)
)
if a >= 0 and c >= 0:
r = a * c, b * d
elif b <= 0 and d <= 0:
r = b * d, a * c
elif a >= 0 and d <= 0:
r = a * d, b * c
elif b <= 0 and c >= 0:
r = b * c, a * d
else:
xs = [0, a * c, a * d, b * c, b * d]
r = min(xs), max(xs)
setattr(alu, lhs, r)
case "div", lhs, rhs:
a, b = getattr(alu, lhs)
c, d = (
(int(rhs), int(rhs))
if rhs.lstrip("-").isnumeric()
else getattr(alu, rhs)
)
if c > 0:
r = a // d, b // c
elif d < 0:
r = a // c, b // d
else:
return None
setattr(alu, lhs, r)
case "mod", lhs, rhs:
a, b = getattr(alu, lhs)
c, d = (
(int(rhs), int(rhs))
if rhs.lstrip("-").isnumeric()
else getattr(alu, rhs)
)
if 0 < c == d:
if b - a + 1 < c and a % c <= b % c:
r = a % c, b % c
else:
r = 0, c - 1
else:
return None
setattr(alu, lhs, r)
case "eql", lhs, rhs:
a, b = getattr(alu, lhs)
c, d = (
(int(rhs), int(rhs))
if rhs.lstrip("-").isnumeric()
else getattr(alu, rhs)
)
if a == b == c == d:
r = 1, 1
elif a <= d and c <= b:
r = 0, 1
else:
r = 0, 0
setattr(alu, lhs, r)
z0, z1 = alu.z
return z0 > 0 or 0 > z1
def part1(lines):
"""
>>> part1(SAMPLE_INPUT)
99999993811817
"""
return solve(lines, range(9, 0, -1))
def part2(lines):
"""
>>> part2(SAMPLE_INPUT)
11111128657365
"""
return solve(lines, range(1, 10))
parts = (part1, part2)