please i need help asap ( Data structure and algorithm)

5. Given an array where the search value k is equally likely to appear in any location, then what is the time complexity if we perform sequential search? Can you present a more efficient algorithm and write out its pseudo code? (10 pts) 6. How to find the largest value in an array of n integers? Design an algorithm with the following header: (10 pts) int largest (int A[], int n )