1. We consider the following problem: Given a sorted array of n distinct integers A[1,..., n]...

 

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1. We consider the following problem: Given a sorted array of n distinct integers A[1,..., n] (where "sorted" means in the increasing order), you want to find out whether there is an index i for which A[i] = i. (a) [5 marks] Design a divide-and-conquer algorithm that solves this problem in time O(log n). (b) [5 marks] Give an argument that your algorithm indeed has running time O(log n) by for- mulating an appropriate recurrence equation and solving it. (c) [3 marks] Give an argument that your algorithm is correct. 1. We consider the following problem: Given a sorted array of n distinct integers A[1,..., n] (where "sorted" means in the increasing order), you want to find out whether there is an index i for which A[i] = i. (a) [5 marks] Design a divide-and-conquer algorithm that solves this problem in time O(log n). (b) [5 marks] Give an argument that your algorithm indeed has running time O(log n) by for- mulating an appropriate recurrence equation and solving it. (c) [3 marks] Give an argument that your algorithm is correct.