54 lines
1.2 KiB
Python
54 lines
1.2 KiB
Python
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import string
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import sys, os; sys.path.append(os.path.join(os.path.dirname(__file__), "../lib"))
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import astar
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elevation = {c:i for i, c in enumerate(string.ascii_lowercase)}
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elevation['E'] = elevation['z']
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elevation['S'] = elevation['a']
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data = open("input").read().splitlines(False)
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#print(*data, sep="\n")
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extra = []
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for y, row in enumerate(data):
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for x, c in enumerate(row):
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if c == 'S':
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start = (x,y)
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elif c == 'E':
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goal = (x,y)
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elif c == 'a':
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# for part 2
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extra.append((x,y))
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def get(x, y):
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return elevation[data[y][x]]
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def solve(part):
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def neighbors(src):
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x,y = src
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here = get(x,y)
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n = []
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def push(x,y):
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if 0 <= y < len(data):
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if 0 <= x < len(data[y]):
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if get(x,y) <= here+1:
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n.append((1, (x,y)))
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push(x-1, y)
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push(x+1,y)
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push(x, y-1)
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push(x, y+1)
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return n
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def heuristic(n):
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return abs(goal[0] - n[0]) + abs(goal[1] - n[1])
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s = [start]
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if part == 2:
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s += extra
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print(part, "=", astar.search(s, goal, neighbors, heuristic))
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solve(1)
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solve(2)
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