advent-of-code/2019/day05_intcode.py

110 lines
2.8 KiB
Python

NUMBER_OF_PARAMS_MAP = {
1: 3,
2: 3,
3: 1,
4: 1,
5: 2,
6: 2,
7: 3,
8: 3,
}
LAST_IS_RESULT_MAP = {
1: True,
2: True,
3: True,
4: False,
5: False,
6: False,
7: True,
8: True,
}
def get_value(program, args, param_modes, index):
if param_modes[index] == 0:
return program[args[index]]
return args[index]
def parse_args(program, raw_args, param_modes, last_is_result=False):
args = []
limit = -1 if last_is_result else None
for i, arg in enumerate(raw_args[:limit]):
args.append(get_value(program, raw_args, param_modes, i))
if last_is_result:
args.append(raw_args[-1])
return args
def compute(lst):
program = lst.copy()
pointer = 0
while pointer < len(program):
pointer_moved = False
instruction = str(program[pointer])
code = int(instruction[-2:])
if code == 99:
print("Halting due to code 99")
return program
number_of_params = NUMBER_OF_PARAMS_MAP[code]
offset = number_of_params + 1
param_modes = instruction[:-2]
param_modes = param_modes.zfill(number_of_params)
param_modes = list(map(int, reversed(param_modes)))
raw_params = []
for i in range(1, offset):
raw_params.append(program[pointer + i])
last_is_result = LAST_IS_RESULT_MAP[code]
params = parse_args(program, raw_params, param_modes, last_is_result)
if code == 1:
# Addition
program[params[2]] = params[0] + params[1]
elif code == 2:
# Multiplication
program[params[2]] = params[0] * params[1]
elif code == 3:
# Input
program[params[0]] = int(input(f"Input for instruction {pointer}\n> "))
elif code == 4:
# Output
print(params[0])
elif code == 5:
# Jump if true
if params[0] != 0:
pointer = params[1]
pointer_moved = True
elif code == 6:
# Jump if false
if params[0] == 0:
pointer = params[1]
pointer_moved = True
elif code == 7:
# Less than
if params[0] < params[1]:
program[params[2]] = 1
else:
program[params[2]] = 0
elif code == 8:
# Equals
if params[0] == params[1]:
program[params[2]] = 1
else:
program[params[2]] = 0
else:
raise ValueError(f"Something bad happened, code={code}")
if not pointer_moved:
pointer += offset
return program
if __name__ == "__main__":
with open("inputs/day05") as f:
compute(list(map(int, f.read().split(","))))