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我来拯救你们了，如果自认为代码没问题，那么过了这几组数据，不AC你找我！

Posted by ecjtu_yuweiwei at 2014-07-21 15:51:47 on Problem 2826 
9
样例一：
6259 2664 8292 9080 1244 2972 9097 9680
答案：6162.65

样例二：
0 1 1 0
1 0 2 1
答案：1.00

样例三：
0 1 2 1
1 0 1 2
答案：0.00

样例四：
0 0 10 10
0 0 9 8
答案：0.00

样例五：
0 0 10 10
0 0 8 9
答案：4.50

样例六：
0.9 3.1 4 0
0 3 2 2
答案：0.50

样例七：
0 0 0 2
0 0 -3 2
答案：3.00

样例八：
1 1 1 4
0 0 2 3
答案：0.75

样例九：
1 2 1 4
0 0 2 3
答案：0.00
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