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128 lines
3.7 KiB
128 lines
3.7 KiB
from enum import IntEnum
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import sys
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def main():
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with open("day5.txt", "rt") as input_file:
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codes = parse_input(input_file.read())
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# input_value = 1
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input_value = 5
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last_output = run_intcode(codes, input_value)
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print("Last output:", last_output)
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def parse_input(text):
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return [int(i) for i in text.rstrip().split(",")]
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class Opcode(IntEnum):
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ADD = 1
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MUL = 2
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IN = 3
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OUT = 4
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JNZ = 5
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JEZ = 6
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LT = 7
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EQ = 8
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HALT = 99
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class ParamMode(IntEnum):
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POS = 0
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IMM = 1
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def run_intcode(codes, input_value):
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last_output = 0
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ip = 0
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while True:
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code, modes = try_parse_code(codes[ip])
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mode1, mode2, _ = modes
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if code == Opcode.ADD:
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print("ADD:", codes[ip : ip + 4])
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operand1 = read_param(codes, ip + 1, mode1)
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operand2 = read_param(codes, ip + 2, mode2)
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output_pos = codes[ip + 3]
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codes[output_pos] = operand1 + operand2
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ip += 4
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elif code == Opcode.MUL:
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print("MUL:", codes[ip : ip + 4])
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operand1 = read_param(codes, ip + 1, mode1)
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operand2 = read_param(codes, ip + 2, mode2)
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output_pos = codes[ip + 3]
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codes[output_pos] = operand1 * operand2
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ip += 4
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elif code == Opcode.IN:
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print("IN:", codes[ip : ip + 2])
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operand_pos = codes[ip + 1]
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codes[operand_pos] = input_value
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ip += 2
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elif code == Opcode.OUT:
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print("OUT:", codes[ip : ip + 2])
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operand = read_param(codes, ip + 1, mode1)
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last_output = operand
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print(" ->", last_output)
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ip += 2
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elif code == Opcode.JNZ:
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print("JNZ:", codes[ip : ip + 3])
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operand = read_param(codes, ip + 1, mode1)
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if operand != 0:
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ip = read_param(codes, ip + 2, mode2)
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else:
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ip += 3
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elif code == Opcode.JEZ:
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print("JEZ:", codes[ip : ip + 3])
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operand = read_param(codes, ip + 1, mode1)
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if operand == 0:
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ip = read_param(codes, ip + 2, mode2)
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else:
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ip += 3
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elif code == Opcode.LT:
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print("LT:", codes[ip : ip + 4])
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operand1 = read_param(codes, ip + 1, mode1)
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operand2 = read_param(codes, ip + 2, mode2)
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output_pos = codes[ip + 3]
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codes[output_pos] = int(operand1 < operand2)
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ip += 4
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elif code == Opcode.EQ:
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print("EQ:", codes[ip : ip + 4])
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operand1 = read_param(codes, ip + 1, mode1)
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operand2 = read_param(codes, ip + 2, mode2)
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output_pos = codes[ip + 3]
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codes[output_pos] = int(operand1 == operand2)
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ip += 4
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elif code == Opcode.HALT:
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print("HALT.")
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break
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else:
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sys.exit("Wrong opcode: {}".format(code))
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return last_output
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def try_parse_code(code):
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try:
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return parse_code(code)
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except ValueError:
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sys.exit("Not a valid code: {}".format(code))
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def parse_code(code):
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opcode = get_digit(code, 2)*10 + get_digit(code, 1)
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mode1 = ParamMode(get_digit(code, 3))
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mode2 = ParamMode(get_digit(code, 4))
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mode3 = ParamMode(get_digit(code, 5))
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return opcode, (mode1, mode2, mode3)
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def get_digit(value, digit):
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digit_str = str(value)
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if digit > len(digit_str):
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return 0
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try:
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return int(digit_str[len(digit_str) - digit])
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except IndexError:
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return 0
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def read_param(codes, pos, mode):
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if mode == ParamMode.POS:
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return codes[codes[pos]]
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elif mode == ParamMode.IMM:
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return codes[pos]
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if __name__ == "__main__":
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main()
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