The FM-index is a succinct text index needing only O(Hkn) bits of space, where n is the text size and Hk is the kth order entropy of the text. FM-index assumes constant alphabet; it uses exponential space in the alphabet size, σ. In this paper we show how the same ideas can be used to obtain an index needing O(Hkn) bits of space, with the constant factor… (More)
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