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58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
#!/usr/bin/env python3
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INPUT_FILE = 'input'
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def main():
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field = [[ int(n) for n in line ] for line in map(str.strip, open(INPUT_FILE, 'r').readlines()) ]
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print(field)
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# make a temporary copy of the field to track what we've already seen.
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seen_field = [[ ' ' for y in range(len(field[0])) ] for x in range(len(field))]
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trees_seen = 0
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# [y][x]
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# go top to bottom.
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for x in range(len(field[0])):
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height = -1
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for y in range(len(field)):
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if field[y][x] > height:
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height = field[y][x]
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if seen_field[y][x] != 'T':
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seen_field[y][x] = 'T'
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trees_seen += 1
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# go bottom to top.
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for x in range(len(field[0])):
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height = -1
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for y in reversed(range(len(field))):
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if field[y][x] > height:
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height = field[y][x]
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if seen_field[y][x] != 'T':
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seen_field[y][x] = 'T'
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trees_seen += 1
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# go left to right.
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for y in range(len(field)):
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height = -1
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for x in range(len(field[0])):
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if field[y][x] > height:
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height = field[y][x]
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if seen_field[y][x] != 'T':
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seen_field[y][x] = 'T'
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trees_seen += 1
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# go right to left.
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for y in range(len(field)):
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height = -1
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for x in reversed(range(len(field[0]))):
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if field[y][x] > height:
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height = field[y][x]
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if seen_field[y][x] != 'T':
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seen_field[y][x] = 'T'
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trees_seen += 1
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print(*seen_field, sep='\n')
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print('trees seen: {}'.format(trees_seen))
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if __name__ == '__main__':
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main()
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