OJ Board

Hello,

I submited the problem 11858 Frosh Week one week ago.
But the judge didn't answer until now.
Could someone take a look on this please?

I saw many people discussing about the case where only t is given.
Many of you supposed the radius of the two inner circles are equals in this case.
But in fact, the resulting area is invariant with the radius in this case.

To prove this is used the following idea.

Make a big circle of radius R ...

I tried with many examples I found in the forum and it seems correct.
But I'm still getting WA

I used a DP with backtracing and I don't know where'e my code is wrong.
Could someone help me please?

PS: It was a silly mistake, I forgot a +1 in the code

I had the following idea

f(0) = f(1) = 1
There's only one way if you have zero or one houses

If you had to place the k-th house to form a valid configuration there are two options

(i) The first k-1 houses form a valid configuration. Then have two ways to connect the k-th house (connect to the ...

Ops.. the problem title is Stacking Boxes, sorry for that.

I'm trying to submmit this problem to the judge but I'm getting PE.
I'd like to know if there's any blank line or espaces that should be avoided in order to get AC.