41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
#!/usr/bin/env python3
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# You are given the following information, but you may prefer to do some research for yourself.
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#
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# 1 Jan 1900 was a Monday.
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# Thirty days has September,
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# April, June and November.
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# All the rest have thirty-one,
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# Saving February alone,
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# Which has twenty-eight, rain or shine.
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# And on leap years, twenty-nine.
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# A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.
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#
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# How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?
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import datetime
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from timeit import default_timer
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def main():
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start = default_timer()
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count = 0
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# Use the datetime library to find out which first day of the month is a Sunday
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for year in range(1901, 2001):
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for month in range(1, 13):
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if datetime.datetime(year, month, 1).weekday() == 6:
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count = count + 1
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end = default_timer()
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print('Project Euler, Problem 19')
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print(f'Answer: {count}')
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print(f'Elapsed time: {end - start:.9f} seconds')
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if __name__ == '__main__':
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main()
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