uva10200測資A

Input:
0 39
0 40
39 40
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
41 47
0 100
101 500
0 500
456 987
1234 9999
0 0
10000 10000
0 10000
Output:
100.00
97.56
50.00
0.00
0.00
100.00
100.00
0.00
100.00
100.00
100.00
71.43
86.14
59.75
65.07
51.50
39.46
100.00
0.00
41.49