212 lines
7.1 KiB
Python
212 lines
7.1 KiB
Python
|
#!/usr/bin/env python
|
||
|
|
|
||
|
|
import itertools
|
||
|
|
import sys
|
||
|
|
from copy import deepcopy
|
||
|
|
from dataclasses import dataclass, field
|
||
|
|
from enum import IntEnum
|
||
|
|
from typing import Callable, List, NamedTuple
|
||
|
|
|
||
|
|
|
||
|
|
class ParameterMode(IntEnum):
|
||
|
|
POSITION = 0 # Acts on address
|
||
|
|
IMMEDIATE = 1 # Acts on the immediate value
|
||
|
|
RELATIVE = 2 # Acts on offset to relative base
|
||
|
|
|
||
|
|
|
||
|
|
class Instruction(NamedTuple):
|
||
|
|
address: int # The address of the instruction, for convenience
|
||
|
|
op: int # The opcode
|
||
|
|
p1_mode: ParameterMode # Which mode is the first parameter in
|
||
|
|
p2_mode: ParameterMode # Which mode is the second parameter in
|
||
|
|
p3_mode: ParameterMode # Which mode is the third parameter in
|
||
|
|
|
||
|
|
|
||
|
|
def lookup_ops(index: int, memory: List[int]) -> Instruction:
|
||
|
|
digits = list(map(int, str(memory[index])))
|
||
|
|
a, b, c, d, e = [0] * (5 - len(digits)) + digits # Pad with default values
|
||
|
|
return Instruction(
|
||
|
|
address=index,
|
||
|
|
op=d * 10 + e,
|
||
|
|
p1_mode=ParameterMode(c),
|
||
|
|
p2_mode=ParameterMode(b),
|
||
|
|
p3_mode=ParameterMode(a),
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class InputInterrupt(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class OutputInterrupt(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
@dataclass
|
||
|
|
class Computer:
|
||
|
|
memory: List[int] # Memory space
|
||
|
|
rip: int = 0 # Instruction pointer
|
||
|
|
input_list: List[int] = field(default_factory=list)
|
||
|
|
output_list: List[int] = field(default_factory=list)
|
||
|
|
is_halted: bool = field(default=False, init=False)
|
||
|
|
relative_base: int = field(default=0, init=False)
|
||
|
|
|
||
|
|
def run(self) -> None:
|
||
|
|
while not self.is_halted:
|
||
|
|
self.run_single()
|
||
|
|
|
||
|
|
def run_no_output_interrupt(self) -> None:
|
||
|
|
while not self.is_halted:
|
||
|
|
try:
|
||
|
|
self.run_single()
|
||
|
|
except OutputInterrupt:
|
||
|
|
continue
|
||
|
|
|
||
|
|
def run_single(self): # Returns True when halted
|
||
|
|
instr = lookup_ops(self.rip, self.memory)
|
||
|
|
if instr.op == 99: # Halt
|
||
|
|
self.is_halted = True
|
||
|
|
elif instr.op == 1: # Sum
|
||
|
|
self._do_addition(instr)
|
||
|
|
elif instr.op == 2: # Multiplication
|
||
|
|
self._do_multiplication(instr)
|
||
|
|
elif instr.op == 3: # Load from input
|
||
|
|
self._do_input(instr)
|
||
|
|
elif instr.op == 4: # Store to output
|
||
|
|
self._do_output(instr)
|
||
|
|
elif instr.op == 5: # Jump if true
|
||
|
|
self._do_jump_if_true(instr)
|
||
|
|
elif instr.op == 6: # Jump if false
|
||
|
|
self._do_jump_if_false(instr)
|
||
|
|
elif instr.op == 7: # Less than
|
||
|
|
self._do_less_than(instr)
|
||
|
|
elif instr.op == 8: # Equal to
|
||
|
|
self._do_equal_to(instr)
|
||
|
|
elif instr.op == 9: # Change relative base
|
||
|
|
self._do_change_relative_base(instr)
|
||
|
|
else:
|
||
|
|
assert False # Sanity check
|
||
|
|
|
||
|
|
def _fill_to_addres(self, address: int) -> None:
|
||
|
|
values = address - len(self.memory) + 1
|
||
|
|
if values <= 0:
|
||
|
|
return
|
||
|
|
for __ in range(values):
|
||
|
|
self.memory.append(0)
|
||
|
|
|
||
|
|
def _get_value(self, mode: ParameterMode, val: int) -> int:
|
||
|
|
if mode == ParameterMode.POSITION:
|
||
|
|
assert 0 <= val # Sanity check
|
||
|
|
self._fill_to_addres(val)
|
||
|
|
return self.memory[val]
|
||
|
|
elif mode == ParameterMode.RELATIVE:
|
||
|
|
val += self.relative_base
|
||
|
|
assert 0 <= val # Sanity check
|
||
|
|
self._fill_to_addres(val)
|
||
|
|
return self.memory[val]
|
||
|
|
assert mode == ParameterMode.IMMEDIATE # Sanity check
|
||
|
|
return val
|
||
|
|
|
||
|
|
def _set_value(self, mode: ParameterMode, address: int, value: int) -> None:
|
||
|
|
if mode == ParameterMode.RELATIVE:
|
||
|
|
address += self.relative_base
|
||
|
|
else:
|
||
|
|
assert mode == ParameterMode.POSITION # Sanity check
|
||
|
|
|
||
|
|
assert address >= 0 # Sanity check
|
||
|
|
self._fill_to_addres(address)
|
||
|
|
|
||
|
|
self.memory[address] = value
|
||
|
|
|
||
|
|
def _do_addition(self, instr: Instruction) -> None:
|
||
|
|
lhs = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
rhs = self._get_value(instr.p2_mode, self.memory[instr.address + 2])
|
||
|
|
dest = self.memory[instr.address + 3]
|
||
|
|
|
||
|
|
self._set_value(instr.p3_mode, dest, lhs + rhs)
|
||
|
|
|
||
|
|
self.rip += 4 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_multiplication(self, instr: Instruction) -> None:
|
||
|
|
lhs = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
rhs = self._get_value(instr.p2_mode, self.memory[instr.address + 2])
|
||
|
|
dest = self.memory[instr.address + 3]
|
||
|
|
|
||
|
|
self._set_value(instr.p3_mode, dest, lhs * rhs)
|
||
|
|
|
||
|
|
self.rip += 4 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_input(self, instr: Instruction) -> None:
|
||
|
|
if len(self.input_list) == 0:
|
||
|
|
raise InputInterrupt # No input, halt until an input is provided
|
||
|
|
|
||
|
|
value = int(self.input_list.pop(0))
|
||
|
|
param = self.memory[instr.address + 1]
|
||
|
|
|
||
|
|
self._set_value(instr.p1_mode, param, value)
|
||
|
|
|
||
|
|
self.rip += 2 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_output(self, instr: Instruction) -> None:
|
||
|
|
value = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
|
||
|
|
self.output_list.append(value)
|
||
|
|
|
||
|
|
self.rip += 2 # Length of the instruction
|
||
|
|
raise OutputInterrupt # Alert that we got an output to give
|
||
|
|
|
||
|
|
def _do_jump_if_true(self, instr: Instruction) -> None:
|
||
|
|
cond = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
value = self._get_value(instr.p2_mode, self.memory[instr.address + 2])
|
||
|
|
|
||
|
|
if cond != 0:
|
||
|
|
self.rip = value
|
||
|
|
else:
|
||
|
|
self.rip += 3 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_jump_if_false(self, instr: Instruction) -> None:
|
||
|
|
cond = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
value = self._get_value(instr.p2_mode, self.memory[instr.address + 2])
|
||
|
|
|
||
|
|
if cond == 0:
|
||
|
|
self.rip = value
|
||
|
|
else:
|
||
|
|
self.rip += 3 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_less_than(self, instr: Instruction) -> None:
|
||
|
|
lhs = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
rhs = self._get_value(instr.p2_mode, self.memory[instr.address + 2])
|
||
|
|
dest = self.memory[instr.address + 3]
|
||
|
|
|
||
|
|
self._set_value(instr.p3_mode, dest, 1 if lhs < rhs else 0)
|
||
|
|
|
||
|
|
self.rip += 4 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_equal_to(self, instr: Instruction) -> None:
|
||
|
|
lhs = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
rhs = self._get_value(instr.p2_mode, self.memory[instr.address + 2])
|
||
|
|
dest = self.memory[instr.address + 3]
|
||
|
|
|
||
|
|
self._set_value(instr.p3_mode, dest, 1 if lhs == rhs else 0)
|
||
|
|
|
||
|
|
self.rip += 4 # Length of the instruction
|
||
|
|
|
||
|
|
def _do_change_relative_base(self, instr: Instruction) -> None:
|
||
|
|
value = self._get_value(instr.p1_mode, self.memory[instr.address + 1])
|
||
|
|
|
||
|
|
self.relative_base += value
|
||
|
|
self.rip += 2 # Length of the instruction
|
||
|
|
|
||
|
|
|
||
|
|
def main() -> None:
|
||
|
|
memory = [int(n) for n in sys.stdin.read().split(",")]
|
||
|
|
computer = Computer(deepcopy(memory), input_list=[2])
|
||
|
|
|
||
|
|
computer.run_no_output_interrupt()
|
||
|
|
print(computer.output_list.pop())
|
||
|
|
assert len(computer.output_list) == 0 # Sanity check
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
main()
|