45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
######################################################################
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# Starts at the startYear, startMonth, startWeekday (assuming you are starting at the 1st of the month).
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# Counts through each month between the time period keeping track of which day of the week the start of
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# each month is falling on. Adds to counter if the weekday is a Sunday on the 1st of the month and outputs.
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######################################################################
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# days in each month for normal and leap years
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monthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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monthDaysLeap = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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# start date information
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startYear = 1901
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startMonth = 1
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startWeekday = 2
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# end date information
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endYear = 2000
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endMonth = 12
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# other variables
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year = startYear
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month = startMonth
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weekday = startWeekday
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counter = 0
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# main
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while year < endYear:
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if weekday == 1:
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counter += 1
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if year%4 == 0:
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weekday = (monthDaysLeap[month-1] + weekday)%7
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else:
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weekday = (monthDays[month-1] + weekday)%7
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if month == 12:
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month = 1
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year += 1
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else:
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month += 1
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print(counter)
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# Solution: 171
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