Something strange with test 12. A lot of people get WA here. I don't find error in my solution and but still get WA. Can anyone help me with test cases. You can submit your tricky test to [Ilya point Grebnov@mail.ru].

Test 12 is wrong! In problem: "Even though the maze is a practice one, no snake of length 18 can get out from it alive". But in Test 12 it is possible and may be in others.

For passing Test 12 you must ignore all circles with len >=18.