Five weekends: Difference between revisions

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@@ Line 5,787: / Line 5,787: @@
 # of the month falls on a Sunday and the month has 31 days.
+LONG_MONTHS = [1,3,5,7,8,10,12]
-dates = []
-.upto(2100) do |year|
+YEARS       = (1900..2100).to_a
-.upto(12) do |month|
+dates = YEARS.product(LONG_MONTHS).map{|y, m| Date.new(y,m,-1)}.select(&:sunday?)
-    d = Date.new(year, month, -1) # -1 is last day of month
-    dates << d if d.sunday? && d.day == 31
-  end
-end
 puts "There are #{dates.size} months with 5 weekends from 1900 to 2100:"
-puts dates.first(5).map { |d| d.strftime("%b %Y") }
+puts dates.first(5).map {|d| d.strftime("%b %Y") }, "..."
+puts dates.last(5).map {|d| d.strftime("%b %Y") }
-puts "..."
-puts dates.last(5).map { |d| d.strftime("%b %Y") }
-years_with_5w = dates.map(&:year)
+years_4w = YEARS - dates.map(&:year)
-years = (1900..2100).to_a - years_with_5w
-puts "There are #{years.size} years without months with 5 weekends:"
+puts "There are #{years_4w.size} years without months with 5 weekends:"
-puts years.join(", ")</lang>
+puts years_4w.join(", ")</lang>
 '''Output'''