Question: Consider the problem of counting, in a given text, the number of substringsthat start with an A and end with a B . For example,

Consider the problem of counting, in a given text, the number of substringsthat start with an A and end with a B. For example, there are four suchsubstrings in CABAAXBYA.a. Design a brute-force algorithm for this problem and determine its effi-ciency class.b. Design a more efficient algorithm for this problem. [Gin04]

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