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Search in a Rotated Array
Easy Accuracy: 55.86% Submissions: 2958 Points: 2

Given a sorted and rotated array A of N distinct elements which is rotated at some point, and given an element key. The task is to find the index of the given element key in the array A.

Example 1:

Input:
N = 9
A[] = {5 ,6 ,7 ,8 ,9 ,10 ,1 ,2 ,3}
key = 10
Output:
5
Explanation: 10 is found at index 5.

Example 2:

Input:
N = 4
A[] = {3, 5, 1, 2}
key = 6
Output:
-1
Explanation: There is no element that has value 6.

Your Task:
Complete the function search() which takes an array arr[] and start, end index of the array and the K as input parameters, and returns the answer.

Expected Time Complexity: O(log N).
Expected Auxiliary Space: O(1).

Constraints:
1 ≤ N ≤ 107
0 ≤ A[i] ≤ 108
1 ≤ key ≤ 108

 

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Search in a Rotated Array

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