200 lines
6.5 KiB
Python
200 lines
6.5 KiB
Python
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#!/usr/bin/env python
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from dataclasses import dataclass
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from enum import IntEnum
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from typing import List, NamedTuple
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class ParameterMode(IntEnum):
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POSITION = 0 # Acts on address
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IMMEDIATE = 1 # Acts on the immediate value
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class Instruction(NamedTuple):
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address: int # The address of the instruction, for convenience
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op: int # The opcode
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p1_mode: ParameterMode # Which mode is the first parameter in
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p2_mode: ParameterMode # Which mode is the second parameter in
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p3_mode: ParameterMode # Which mode is the third parameter in
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def lookup_ops(index: int, memory: List[int]) -> Instruction:
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digits = list(map(int, str(memory[index])))
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a, b, c, d, e = [0] * (5 - len(digits)) + digits # Pad with default values
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return Instruction(
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address=index,
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op=d * 10 + e,
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p1_mode=ParameterMode(c),
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p2_mode=ParameterMode(b),
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p3_mode=ParameterMode(a),
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)
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@dataclass
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class Computer:
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memory: List[int] # Memory space
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rip: int = 0 # Instruction pointer
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def run(self):
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while True:
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instr = lookup_ops(self.rip, self.memory)
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if instr.op == 99: # Halt
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return
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elif instr.op == 1: # Sum
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self.do_addition(instr)
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elif instr.op == 2: # Multiplication
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self.do_multiplication(instr)
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elif instr.op == 3: # Load from input
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self.do_input(instr)
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elif instr.op == 4: # Store to output
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self.do_output(instr)
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elif instr.op == 5: # Jump if true
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self.do_jump_if_true(instr)
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elif instr.op == 6: # Jump if false
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self.do_jump_if_false(instr)
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elif instr.op == 7: # Less than
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self.do_less_than(instr)
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elif instr.op == 8: # Equal to
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self.do_equal_to(instr)
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else:
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assert False # Sanity check
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def do_addition(self, instr: Instruction) -> None:
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lhs, rhs, dest = self.memory[instr.address + 1 : instr.address + 4]
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if instr.p1_mode == ParameterMode.POSITION:
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lhs = self.memory[lhs]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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if instr.p2_mode == ParameterMode.POSITION:
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rhs = self.memory[rhs]
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else:
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assert instr.p2_mode == ParameterMode.IMMEDIATE # Sanity check
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assert instr.p3_mode == ParameterMode.POSITION # Sanity check
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self.memory[dest] = lhs + rhs
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self.rip += 4 # Length of the instruction
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def do_multiplication(self, instr: Instruction) -> None:
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lhs, rhs, dest = self.memory[instr.address + 1 : instr.address + 4]
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if instr.p1_mode == ParameterMode.POSITION:
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lhs = self.memory[lhs]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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if instr.p2_mode == ParameterMode.POSITION:
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rhs = self.memory[rhs]
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else:
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assert instr.p2_mode == ParameterMode.IMMEDIATE # Sanity check
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assert instr.p3_mode == ParameterMode.POSITION # Sanity check
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self.memory[dest] = lhs * rhs
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self.rip += 4 # Length of the instruction
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def do_input(self, instr: Instruction) -> None:
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value = int(input())
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param = self.memory[instr.address + 1]
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assert instr.p1_mode == ParameterMode.POSITION # Sanity check
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self.memory[param] = value
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self.rip += 2 # Length of the instruction
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def do_output(self, instr: Instruction) -> None:
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value = self.memory[instr.address + 1]
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if instr.p1_mode == ParameterMode.POSITION:
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value = self.memory[value]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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print(value)
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self.rip += 2 # Length of the instruction
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def do_jump_if_true(self, instr: Instruction) -> None:
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cond, value = self.memory[instr.address + 1 : instr.address + 3]
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if instr.p1_mode == ParameterMode.POSITION:
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cond = self.memory[cond]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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if instr.p2_mode == ParameterMode.POSITION:
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value = self.memory[value]
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else:
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assert instr.p2_mode == ParameterMode.IMMEDIATE # Sanity check
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if cond != 0:
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self.rip = value
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else:
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self.rip += 3 # Length of the instruction
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def do_jump_if_false(self, instr: Instruction) -> None:
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cond, value = self.memory[instr.address + 1 : instr.address + 3]
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if instr.p1_mode == ParameterMode.POSITION:
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cond = self.memory[cond]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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if instr.p2_mode == ParameterMode.POSITION:
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value = self.memory[value]
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else:
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assert instr.p2_mode == ParameterMode.IMMEDIATE # Sanity check
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if cond == 0:
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self.rip = value
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else:
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self.rip += 3 # Length of the instruction
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def do_less_than(self, instr: Instruction) -> None:
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lhs, rhs, dest = self.memory[instr.address + 1 : instr.address + 4]
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if instr.p1_mode == ParameterMode.POSITION:
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lhs = self.memory[lhs]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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if instr.p2_mode == ParameterMode.POSITION:
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rhs = self.memory[rhs]
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else:
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assert instr.p2_mode == ParameterMode.IMMEDIATE # Sanity check
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assert instr.p3_mode == ParameterMode.POSITION # Sanity check
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self.memory[dest] = 1 if lhs < rhs else 0
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self.rip += 4 # Length of the instruction
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def do_equal_to(self, instr: Instruction) -> None:
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lhs, rhs, dest = self.memory[instr.address + 1 : instr.address + 4]
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if instr.p1_mode == ParameterMode.POSITION:
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lhs = self.memory[lhs]
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else:
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assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
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if instr.p2_mode == ParameterMode.POSITION:
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rhs = self.memory[rhs]
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else:
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assert instr.p2_mode == ParameterMode.IMMEDIATE # Sanity check
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assert instr.p3_mode == ParameterMode.POSITION # Sanity check
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self.memory[dest] = 1 if lhs == rhs else 0
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self.rip += 4 # Length of the instruction
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def main() -> None:
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with open("input") as mem_f:
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memory = [int(n) for n in mem_f.read().split(",")]
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computer = Computer(memory)
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computer.run()
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if __name__ == "__main__":
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main()
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