*[[Problem 2039 - Look Back>http://herbert.tealang.info/problem.php?id=2039]] [#t0457601] [[prev>Problem 2038]] | [[next>Problem 2040]] #get_img(2039) #br |Author|Limit|h |MarioDan|13| #br **関連 [#p5645dcb] #br **コメント [#w5fa4247] #pcomment(reply)