摘要：
Your task is, given an integer N, to make a palidrome (word that reads the same when you reverse it) of length at least N. Any palindrome will do. Eas 阅读全文
摘要：
You are the King of Byteland. Your agents have just intercepted a batch of encrypted enemy messages concerning the date of the planned attack on your 阅读全文
摘要：
A substring of a string T is defined as: T( i, k)= TiTi +1... Ti+k -1, 1≤ i≤ i+k-1≤| T|. Given two strings A, B and one integer K, we define S, a set 阅读全文