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88 lines
2.1 KiB
Python
88 lines
2.1 KiB
Python
"""AOC 2020 Day 9"""
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import pathlib
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import time
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import itertools
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TEST_INPUT = """35
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20
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15
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25
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47
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40
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62
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55
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65
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95
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102
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117
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150
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182
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127
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219
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299
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277
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309
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576"""
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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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entries = list()
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for entry in input_data.split('\n'):
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entries.append(int(entry))
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return entries
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def part1(entries: list, preamble_length: int) -> int:
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"""part1 solver"""
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for index, entry in enumerate(entries[preamble_length:]):
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preamble = entries[index:index+preamble_length]
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if entry not in [i+j for i, j in itertools.combinations(preamble, 2)]:
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return entry
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return None
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def part2(entries: list, invalid_number: int) -> int:
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"""part2 solver"""
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left, right = 0, 1
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interval_sum = entries[left] + entries[right]
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while True:
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if interval_sum < invalid_number:
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right += 1
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interval_sum += entries[right]
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elif interval_sum > invalid_number:
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interval_sum -= entries[left]
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left += 1
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else:
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numbers = sorted(entries[left:right+1])
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return numbers[0] + numbers[-1]
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def test_input_day_9():
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"""pytest testing function"""
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entries = extract(TEST_INPUT)
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assert part1(entries, 5) == 127
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assert part2(entries, 127) == 62
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def test_bench_day_9(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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invalid_number = part1(entries, 25)
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print("Part 1: %d" % invalid_number)
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print("Part 2: %d" % part2(entries, invalid_number))
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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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