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module T11545 where
data A = A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A deriving (Eq)
data QuadTree a = QuadTree !Int [a] (QuadTree a) (QuadTree a) (QuadTree a) (QuadTree a)
foldQuadTree :: (a -> b -> b) -> Int -> b -> QuadTree a -> b
foldQuadTree f maxSize = go
where
go z (QuadTree size elems t1 t2 t3 t4)
| size <= maxSize = foldr f z elems
| otherwise = go (go (go (go z t4) t3) t2) t1
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