修改的z可以是

小数

记得用double，不然会全WA

自己调了半小时才发现

（这里附上样例一输入输出）

---

in

• 8 15 8.46 6.03 3.73 0.32 7.43 3.71 8.04 8.22 3 1 8 1 2 8 -2.7566713364794850E+0000 1 2 8 2.1308819339610636E+0000 1 1 6 1.5912831262685359E+0000 1 1 8 -2.7779214559122920E+0000 1 1 8 -6.5134523715823889E-0001 3 2 8 1 1 6 -8.5440817382186651E-0001 3 2 8 2 2 8 3 2 7 1 3 8 -1.8737916438840330E+0000 1 1 7 2.5193137815222144E+0000 1 3 8 1.2835426828823984E+0000 3 3 8

out

7.4145

5.2609

6.2101

1.8256

6.1810

5.8854