17 lines
493 B
Python
17 lines
493 B
Python
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#!/usr/bin/env python3
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INPUT_FILE = 'input.txt'
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def main():
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reports = [list(map(int, vals.split())) for vals in open(INPUT_FILE, 'r').readlines()]
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safe_reports = 0
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for report in reports:
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ok = all([1 <= abs(report[i] - report[i + 1]) <= 3 for i in range(len(report) - 1 )])
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is_sorted = report == sorted(report) or report == sorted(report, reverse=True)
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if ok and is_sorted: safe_reports += 1
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print(safe_reports)
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if __name__ == '__main__':
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main()
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