56 lines
1.4 KiB
Python
56 lines
1.4 KiB
Python
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def weekday_generator_function():
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while True:
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yield 'Monday'
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yield 'Tuesday'
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yield 'Wednesday'
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yield 'Thursday'
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yield 'Friday'
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yield 'Saturday'
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yield 'Sunday'
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def day_of_month_generator_function():
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day, month, year = 1, 1, 1901
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while year < 2001:
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yield day
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day += 1
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if month == 2:
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if year % 4 == 0 and (not year % 100 == 0 or year % 400 == 0):
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if day == 30:
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month += 1
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day = 1
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elif day == 29:
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month += 1
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day = 1
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elif month in [9, 4, 6, 11] and day == 31:
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day = 1
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month += 1
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elif month in [1, 3, 5, 7, 8, 10] and day == 32:
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day = 1
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month += 1
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elif month == 12 and day == 32:
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day = 1
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month = 1
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year += 1
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def euler_019():
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wds = weekday_generator_function()
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next(wds) # get rid of first Monday
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ds = zip(wds, day_of_month_generator_function())
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s = len([1 for weekday, date in ds if weekday == "Sunday" and date == 1])
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return s
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def euler_019_brain():
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""" We have 100 years which means
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1200 months. Every months starts with a day
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and 1/7 of all days are Sundays. """
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return 1200 // 7
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if __name__ == "__main__":
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assert(euler_019() == 171)
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assert(euler_019() == euler_019_brain())
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print("e019.py: {}".format(euler_019()))
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