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107 lines
2.9 KiB
Python
107 lines
2.9 KiB
Python
"""AOC 2020 Day 8"""
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import pathlib
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import time
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TEST_INPUT = """nop +0
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acc +1
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jmp +4
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acc +3
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jmp -3
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acc -99
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acc +1
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jmp -4
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acc +6"""
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class Instruction:
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"""Instruction class hold an operation, an argument and an execution counter"""
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op = None
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arg = None
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def __init__(self, op, arg):
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self.op = op
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self.arg = arg
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def read_input(input_path: str) -> str:
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"""take input file path and return a str with the file's content"""
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with open(input_path, 'r') as input_file:
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input_data = input_file.read().strip()
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return input_data
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def extract(input_data: str) -> list:
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"""take input data and return the appropriate data structure"""
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instructions = list()
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for instruction in input_data.split('\n'):
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op, arg = instruction.split(' ')
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arg = int(arg)
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assert op in ('acc', 'jmp', 'nop')
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instructions.append(Instruction(op, arg))
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return instructions
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def run(entries: list) -> (int, bool):
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"""run instructions"""
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instruction_counter = 0
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prev_instruction_counter = 0
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accumulator = 0
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exec_counter = [0]*len(entries)
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while instruction_counter < len(entries):
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prev_instruction_counter = instruction_counter
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instruction = entries[instruction_counter]
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if exec_counter[instruction_counter] != 0:
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return accumulator, False
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if instruction.op == 'nop':
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instruction_counter += 1
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elif instruction.op == 'acc':
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accumulator += instruction.arg
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instruction_counter += 1
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elif instruction.op == 'jmp':
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instruction_counter += instruction.arg
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else:
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raise ValueError('Invalid instruction operation %s' % instruction.op)
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exec_counter[prev_instruction_counter] += 1
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return accumulator, True
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def part1(entries: list) -> int:
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"""part1 solver"""
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return run(entries)[0]
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def part2(entries: list) -> int:
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"""part2 solver"""
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for instruction in entries:
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if instruction.op == 'acc':
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continue
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original_instruction = instruction.op
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instruction.op = 'jmp' if instruction.op == 'nop' else 'nop'
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accumulator, success = run(entries)
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if success:
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return accumulator
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instruction.op = original_instruction
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def test_input_day_8():
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"""pytest testing function"""
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entries = extract(TEST_INPUT)
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assert part1(entries) == 5
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assert part2(entries) == 8
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def test_bench_day_8(benchmark):
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"""pytest-benchmark function"""
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benchmark(main)
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def main():
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"""main function"""
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input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
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start_time = time.time()
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input_data = read_input(input_path)
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entries = extract(input_data)
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print("Part 1: %d" % part1(entries))
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print("Part 2: %d" % part2(entries))
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end_time = time.time()
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print("Execution time: %f" % (end_time-start_time))
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if __name__ == "__main__":
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main()
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