To admins.

Add this test please:

1 1
1
0.5 0.1

Because my run with ID 1991789 gives the answer 0.467,
my run with ID 1991794 gives the answer 0.075.
But both are accepted.

P.S. It's very special case. Please, study more carefully case L=W=1. It contains about 7 different situations.