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56 lines
1.7 KiB
56 lines
1.7 KiB
import math
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import sys
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def main():
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with open("day16.txt", "rt") as input_file:
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inputs = [int(i) for i in input_file.read().rstrip()]
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# Part 1
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result = phaze2phaze(inputs)
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print(f"First 8 digits: {''.join(str(int(i)) for i in result[:8])}")
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# Part 2
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offset = int(''.join(str(i) for i in inputs[:7]))
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rev_inputs = [i for _ in range(10000) for i in reversed(inputs)]
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rev_offset = len(rev_inputs) - offset
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print(f"Offset: {offset}. Reversed offset: {rev_offset}")
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result = phaze4phaze(rev_inputs, index_limit=rev_offset + 8)
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result_slice = result[rev_offset-8:rev_offset]
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result_slice.reverse()
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print(f"Answer: {''.join(str(int(i)) for i in result_slice)}")
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def p(index, pos):
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return round(math.cos(((pos - index + 1) // index) * (math.pi / 2)))
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def phaze2phaze(inputs, rounds=100):
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""" https://www.youtube.com/watch?v=i0leFvyLEF8 """
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for phase_id in range(rounds):
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print_phaze(phase_id + 1)
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outputs = [None] * len(inputs)
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for index in range(len(inputs)):
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out = sum(x * p(index + 1, pos + index) for pos, x in enumerate(inputs[index:]))
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outputs[index] = abs(math.fmod(out, 10))
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inputs = outputs
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return inputs
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def phaze4phaze(rev_inputs, index_limit):
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for phase_id in range(100):
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print_phaze(phase_id + 1)
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outputs = [None] * index_limit
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sumsum = 0
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for index in range(index_limit):
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sumsum += rev_inputs[index]
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outputs[index] = abs(math.fmod(sumsum, 10))
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rev_inputs = outputs
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return rev_inputs
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def print_phaze(n):
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print(f"{n}... ", end="")
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sys.stdout.flush()
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if __name__ == "__main__":
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main()
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