九度题目1002：Grading
May 16, 2016
作者：dengshuai_super
出处：http://blog.csdn.net/dengshuai_super/article/details/51425105
声明：自由转载，转载请注明作者及出处。
题目1002：Grading
题目描述：
Grading hundreds of thousands of Graduate Entrance Exams is a hard work. It is even harder to design a process to make the results as fair as possible. One way is to assign each exam problem to 3 independent experts. If they do not agree to each other, a judge is invited to make the final decision. Now you are asked to write a program to help this process.
For each problem, there is a full-mark P and a tolerance T(输入：
Each input file may contain more than one test case.
Each case occupies a line containing six positive integers: P, T, G1, G2, G3, and GJ, as described in the problem. It is guaranteed that all the grades are valid, that is, in the interval [0, P].
输出：
For each test case you should output the final grade of the problem in a line. The answer must be accurate to 1 decimal place.
样例输入：
20 2 15 13 10 18
样例输出：
14.0
题目分析：
输入为6个参数：P, T, G1, G2, G3, and GJ ，全部的成绩都满足在[0, P]区间内。
分级规则：
•问题将首先被分配到2个专家，得到G1和G2。如果差异是可以接受的，也就是满足|G1 - G2| ≤ T，这一问题的成绩将取G1和G2的平均值。
•如果差异超过T，第三专家将给G3。
•如果G3和G1或G2的差值只有其中一个在公差范围内，那么这个问题的成绩将取G3和最接近的成绩的平均值。
•如果G3和G1或G2的差值都在公差范围内，那么这一问题的成绩将取G1，G2，G3的最大值。
•如果没有G3和G1 或G2的差值都不在的公差范围内，将作出最后的等级GJ。
代码如下：
/*****************************************************************************
* 九度题目1002：Grading
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* by Deng shuai May 16 2016
* http://blog.csdn.net/dengshuai_super
******************************************************************************
* Copyright (c) 2016, Deng Shuai
* All rights reserved.
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