Exercises on "BeginningAlgorithmContests" 2nd edition

According exercises in "BeginningAlgorithmContests", I wrote these codes to solve these exercise and ensure I have learned something. The answer can be found in https://github.com/aoapc-book/aoapc-bac2nd.

算法竞赛入门经典（第二版） 练习

为了完成书中的习题而写的代码，正确答案可以在上面的地址找到。