#!/usr/bin/env python
import sys
from dataclasses import dataclass, field
from enum import IntEnum
from typing import Iterable, List, NamedTuple, Tuple, TypeVar
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
class Tile(IntEnum):
EMPTY = 0
WALL = 1
BLOCK = 2
PADDLE = 3
BALL = 4
def main() -> None:
memory = [int(n) for n in sys.stdin.read().split(",")]
memory[0] = 2 # Play for free
game = Computer(memory)
T = TypeVar("T")
def grouped(l: Iterable[T], n: int) -> Iterable[Tuple[T, ...]]:
return zip(*[iter(l)] * n)
paddle_pos = None
ball_pos = None
score = None
output_num = 0
while not game.is_halted:
try:
game.run()
except OutputInterrupt:
output_num += 1
if output_num < 3: # Not processable yet
continue
x, y = game.output_list[0:2]
if x == -1 and y == 0: # Score display
score = game.output_list[2]
else:
tile_type = Tile(game.output_list[2])
if tile_type == Tile.PADDLE:
paddle_pos = x
elif tile_type == Tile.BALL:
ball_pos = x
game.output_list.clear() # Remove processed tiles
output_num = 0 # Reset count for next output
except InputInterrupt:
assert paddle_pos is not None and ball_pos is not None # Sanity check
offset = ball_pos - paddle_pos
game.input_list.append(0 if offset == 0 else offset // abs(offset))
assert score is not None # Sanity check
print(score)
if __name__ == "__main__":
main()