Implement Order Statistic Tree (fixes #15) #24
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- Added size attributes to each tree node, which store the size of the tree below. - Added `get` method which provides retrieval of data by index. - Added `rank` method which returns the index of data.
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I've added a
sizeattribute to each node that tracks the size of the tree rooted at that node. This allows for aget(index)(getting the item at an index), and arank(data)(getting the index of an item), both in O(logn) time.See https://en.wikipedia.org/wiki/Order_statistic_tree.