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    • P4088【SDOI2017】相关分析
    Limits : Time Limit : 17000 MS   Memory Limit : 131072 KB  SPJ
    Description

    Input Format

    Output Format

    Sample Input

    3 5
    1 2 3
    1 2 3
    1 1 3
    2 2 3 -3 2
    1 1 2
    3 1 2 2 1
    1 1 3

    Sample Output

    1.0000000000
    -1.5000000000
    -0.6153846154

    Hint

    Source  感谢1879570236获取数据并搬运