摘要：
On September 22, 2004, Oceanic Flight 815 crashed on a mysterious island somewhere in the pacific. There actually were survivors in the crash , N surv 阅读全文
摘要：
Rastas's has been given a number n. Being weak at mathematics, she has to consider all the numbers from 1 to 2n - 1 so as to become perfect in calcula 阅读全文