102 lines
3 KiB
Python
Executable file
102 lines
3 KiB
Python
Executable file
#!/usr/bin/env python
|
|
|
|
from enum import IntEnum
|
|
from typing import List, NamedTuple
|
|
|
|
|
|
class ParameterMode(IntEnum):
|
|
POSITION = 0 # Acts on address
|
|
IMMEDIATE = 1 # Acts on the immediate value
|
|
|
|
|
|
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),
|
|
)
|
|
|
|
|
|
def do_addition(instr: Instruction, memory: List[int]) -> int:
|
|
lhs, rhs, dest = memory[instr.address + 1 : instr.address + 4]
|
|
if instr.p1_mode == ParameterMode.POSITION:
|
|
lhs = memory[lhs]
|
|
if instr.p2_mode == ParameterMode.POSITION:
|
|
rhs = memory[rhs]
|
|
assert instr.p3_mode != ParameterMode.IMMEDIATE # Sanity check
|
|
memory[dest] = lhs + rhs
|
|
|
|
return 4 # Length of the instruction
|
|
|
|
|
|
def do_multiplication(instr: Instruction, memory: List[int]) -> int:
|
|
lhs, rhs, dest = memory[instr.address + 1 : instr.address + 4]
|
|
if instr.p1_mode == ParameterMode.POSITION:
|
|
lhs = memory[lhs]
|
|
if instr.p2_mode == ParameterMode.POSITION:
|
|
rhs = memory[rhs]
|
|
assert instr.p3_mode != ParameterMode.IMMEDIATE # Sanity check
|
|
memory[dest] = lhs * rhs
|
|
|
|
return 4 # Length of the instruction
|
|
|
|
|
|
def do_input(instr: Instruction, memory: List[int]) -> int:
|
|
value = int(input())
|
|
param = memory[instr.address + 1]
|
|
|
|
assert instr.p1_mode == ParameterMode.POSITION # Sanity check
|
|
memory[param] = value
|
|
|
|
return 2 # Length of the instruction
|
|
|
|
|
|
def do_output(instr: Instruction, memory: List[int]) -> int:
|
|
value = memory[instr.address + 1]
|
|
if instr.p1_mode == ParameterMode.POSITION:
|
|
value = memory[value]
|
|
else:
|
|
assert instr.p1_mode == ParameterMode.IMMEDIATE # Sanity check
|
|
|
|
print(value)
|
|
|
|
return 2 # Length of the instruction
|
|
|
|
|
|
def run_op(memory: List[int]) -> None:
|
|
index = 0
|
|
while True:
|
|
instr = lookup_ops(index, memory)
|
|
if instr.op == 99: # Halt
|
|
return
|
|
elif instr.op == 1: # Sum
|
|
index += do_addition(instr, memory)
|
|
elif instr.op == 2: # Multiplication
|
|
index += do_multiplication(instr, memory)
|
|
elif instr.op == 3: # Load from input
|
|
index += do_input(instr, memory)
|
|
elif instr.op == 4: # Store to output
|
|
index += do_output(instr, memory)
|
|
|
|
|
|
def main() -> None:
|
|
with open("input") as mem_f:
|
|
memory = [int(n) for n in mem_f.read().split(",")]
|
|
run_op(memory)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|