49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
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import numpy as np
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with open('input17', 'r') as file:
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init_state = np.array([[c == '#' for c in l.strip()] for l in file.readlines()])
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def sim_step3d(state):
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new_state = set()
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neighbours = {}
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for (x,y,z) in state:
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for i in (-1,0,1):
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for j in (-1,0,1):
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for k in (-1,0,1):
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neighbours[(x+i,y+j,z+k)] = neighbours.get((x+i,y+j,z+k), 0) + 1
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for loc, n in neighbours.items():
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if loc in state:
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if n in (3,4): # We added an off-by-one by counting active cubes as their own neighbour for simplicity
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new_state.add(loc)
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elif n == 3:
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new_state.add(loc)
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return new_state
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state = {(x,y,0) for (x, y), v in np.ndenumerate(init_state) if v}
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for i in range(6):
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state = sim_step3d(state)
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print(f'Part 1: {len(state)}')
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def sim_step4d(state):
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new_state = set()
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neighbours = {}
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for (x,y,z,u) in state:
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for i in (-1,0,1):
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for j in (-1,0,1):
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for k in (-1,0,1):
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for l in (-1,0,1):
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neighbours[(x+i,y+j,z+k,u+l)] = neighbours.get((x+i,y+j,z+k,u+l), 0) + 1
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for loc, n in neighbours.items():
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if loc in state:
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if n in (3,4): # We added an off-by-one by counting active cubes as their own neighbour for simplicity
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new_state.add(loc)
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elif n == 3:
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new_state.add(loc)
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return new_state
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state = {(x,y,0,0) for (x, y), v in np.ndenumerate(init_state) if v}
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for i in range(6):
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state = sim_step4d(state)
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print(f'Part 2: {len(state)}')
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