30 lines
689 B
Python
30 lines
689 B
Python
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from collections import Counter
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from itertools import pairwise
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reports = [i.rstrip() for i in open("input").readlines()]
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reports = [[int(j) for j in i.split(' ')] for i in reports]
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def reduce_report_to_state(report):
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p = pairwise(report)
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diffs = [x - y for x, y in p]
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absdiff = list(map(abs, diffs))
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c = Counter(absdiff)
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if c[0] > 0:
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return False
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signs = list(map(lambda x: x > 0, diffs))
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signs = set(signs)
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if len(signs) != 1:
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return False
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for i in absdiff:
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if i < 1 or i > 3:
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return False
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return True
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processed = map(reduce_report_to_state, reports)
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counted = Counter(processed)
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print(counted[True])
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