input:

10000
32 6
45 98
67 57
35 70
29 3
22 81
59 12
48 16
63 69
99 36
60 36
32 47
73 91
81 30
7 7
71 57
38 60
35 19
92 40
3 17
21 71
54 62
95 67
60 50
10 20
19 80
64 73
10 21
70 97
84 3
26 22
38 47
37 38
31 91
11 37
73 17
75 98
8 74
73 60
87 10
94 48
35 73
18 14
88 25
61 54
39 59
100 90
70 98
73 21
92 11
...

output:

16.78
0
-30.09
0
21.47
0
26.63
9.45
0
13.18
-11.63
0
0
10.10
0
-29.01
0
-3.85
1.87
0
0
0
-30.37
-25.90
0
0
0
0
0
78.70
-10.81
0
0
0
0
28.06
0
0
-31.11
58.17
-8.33
0
-6.13
24.50
-29.00
0
-49.75
0
20.00
60.28
0
0
26.84
-8.66
6.74
0
8.12
-33.58
14.29
0
0
18.60
0
-12.04
36.43
0
21.44
0
8.38
-21.04
-2.18...

result:

wrong answer WA (test case 3)