diff --git a/e019.py b/e019.py new file mode 100644 index 0000000..078e558 --- /dev/null +++ b/e019.py @@ -0,0 +1,30 @@ +class Day: + SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY = range(7) + +def is_leap_year(year): + return (year % 100 > 0 and year % 4 == 0) or (year % 400 == 0) + +year = 1900 +# 1/1/1900 was a Monday +first_day = Day.MONDAY + +total = 0 +while year < 2000: + year = year + 1 + # Count last year's days to advance the starting weekday + days = 366 if is_leap_year(year - 1) else 365 + # List the number of days in each month for this year + months = [ + 31, + 29 if is_leap_year(year) else 28, + 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 + ] + first_day = (first_day + days % 7) % 7 + sundays = 0 + for m in range(len(months)): + days = sum(months[:m]) + first_sunday = (7 - ((first_day + days % 7) % 7)) % 7 + 1 + if first_sunday == 1: + total = total + 1 + +print 'Total months beginning on Sunday from 1/1/1901 to 12/31/2000: {0}'.format(total)