My Advent of Code solutions in Python.
kevinyap.ca/2019/12/going-fast-in-advent-of-code/
advent-of-code
python
Update day13.py
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2016/day13.py
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2016/day13.py
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INPUT = int(fileinput.input()[0])
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def is_open(x, y, input=INPUT):
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def is_open(x, y, seed=INPUT):
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"""Open space if number of 1 bits is even, else wall."""
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num = (x * x) + (3 * x) + (2 * x * y) + y + (y * y) + input
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num = (x * x) + (3 * x) + (2 * x * y) + y + (y * y) + seed
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return bin(num)[2:].count('1') % 2 == 0
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