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iz/競技プログラミング/Project Euler 019 Counting Sundays
MMA

http://projecteuler.net/problem=19

やるだけ 

   1 require 'date'
   2 p (Date.new(1901, 1, 1)..Date.new(2000, 12, 31)).to_a.select{|d| d.cwday == 7 && d.day == 1}.count

iz/競技プログラミング/Project Euler 019 Counting Sundays (last edited 2012-12-21 09:27:26 by iz)