yuebaba的博客

Today on a lecture about strings Gerald learned a new definition of string equivalency. Two strings a and b of equal length are called equivalent in one of the two cases: They are equal. If we split...

After successive failures in the battles against the Union, the Empire retreated to its last stronghold. Depending on its powerful defense system, the Empire repelled the six waves of Union's attack. ...

在一个排列中，如果一对数的前后位置与大小顺序相反，即前面的数大于后面的数，那么它们就称为一个逆序。一个排列中逆序的总数就称为这个排列的逆序数。 如2 4 3 1中，2 1，4 3，4 1，3 1是逆序，逆序数是4。给出一个整数序列，求该序列的逆序数。 Input 第1行：N，N为序列的长度（n <= 50000)  第2 - N + 1行：序列中的元素（0 <= Aii <...

Have you ever played quoit in a playground? Quoit is a game in which flat rings are pitched at some toys, with all the toys encircled awarded.  In the field of Cyberground, the position of each toy is...