55 lines
1.2 KiB
Python
55 lines
1.2 KiB
Python
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import itertools
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rocks = [
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0b00011110,
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0b00001000_00011100_00001000,
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0b00000100_00000100_00011100,
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0b00010000_00010000_00010000_00010000,
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0b00011000_00011000,
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]
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jets = itertools.cycle(">>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>")
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jets = itertools.cycle(open("input").read().strip())
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rocki = itertools.cycle(rocks)
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a = 0b11111111
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wall = 0b10000000_10000000_10000000_10000000_10000000
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stopped = 0
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r = 0
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while stopped < 2022:
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if r == 0:
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# start falling
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r = next(rocki)
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h = a.bit_length() + 8*3
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if h % 8 != 0:
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h += 8 - h%8
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#for i in reversed(range(0,a.bit_length(),8)):
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# print("{:08b}".format((a>>i)&0xff))
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#print()
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else:
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# continue falling?
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if r & (a>>(h-8)) == 0:
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h -= 8
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else:
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# stop
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a |= (r<<h)
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r = 0
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stopped += 1
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continue
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j = next(jets)
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if j == '<':
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x = (r<<1)
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if x & wall == 0:
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if x & (a>>h) == 0:
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r = x
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elif j == '>':
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x = (r<<7)
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if x & wall == 0:
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x >>= 8
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if x & (a>>h) == 0:
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r = x
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import math
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print(math.ceil((a>>8).bit_length()/8))
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