华为oj基础训练题，合唱队，共N个人挑出N-K个人，剩下的组成中间高两边递减的合唱队-Huawei oj basic training topic, chorus, a total of N pick N- K individuals, diminishing the rest of the middle high on both sides of the chorus

练习C++代码好程序,基础训练加自我开发-important source code for exercising the C++