Given a sorted array of size N and an integer K, find the position at which K is present in the array using binary search.
Example 1:
Input: N = 5 arr[] = {1 2 3 4 5} K = 4 Output: 3 Explanation: 4 appears at index 3.
Example 2:
Input: N = 5 arr[] = {11 22 33 44 55} K = 445 Output: -1 Explanation: 445 is not present.
Your Task:
You dont need to read input or print anything. Complete the function binarysearch() which takes arr[], N and K as input parameters and returns the index of K in the array. If K is not present in the array, return -1.
Expected Time Complexity: O(LogN) Expected Auxiliary Space: O(LogN) if solving recursively and O(1) otherwise.
Constraints:
1 <= N <= 105 1 <= arr[i] <= 106 1 <= K <= 106