Question: Describe an efficient data structure for storing a set S of n items with ordered keys, so as to support a rankRange(a, b) method, which

Describe an efficient data structure for storing a set S of n items with ordered keys, so as to support a rankRange(a, b) method, which enumerates all the items with keys whose rank in S is in the range [a, b], where a and b are integers in the interval [0, n − 1]. Describe methods for object insertions and deletion, and characterize the running times for these and the rankRange method.

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