题目链接

DRM Encryption is a new kind of encryption. Given an encrypted string (which we’ll call a DRM message), the de…

There is an island called PiLiPaLa.In the island there is a wild animal living in it, and you can call them Pu…

传送门：POJ1316 In 1949 the Indian mathematician D.R. Kaprekar discovered a class of numbers called self-numbers. …

传送门：这里 题意：一摞书，无序，可以把某本书抽到最顶上，问最少抽几次可以使书有序。

传送门：这里 Given an array with n integers, and you are given two indices i and j (i ≠ j) in the array. You have to…

题目链接：点我点我w~ XXI Berland Annual Fair is coming really soon! Traditionally fair consists of nn booths, arranged …