Problem.#31(30pts) Given an array A of n integers, a leader element of the array A is the element that appears more than half of the time in A. Using one stack, implement in Java an O(n) running time complexity method static int leader(int[] A) to find a leader element and return the index (any) of the leader in A. The program must returns -1 if no leader element exists. Examples: int[l a (23, 23, 67, 23,,67, 23, 45); int[) a (23, 24, 67, 23, 67, 23, 45); leader (a) 5 leader(a) - 1 Important Notes You must add the main method in your program to test your implementation. There are no data errors that need to be checked as all the data will be assumed correct. You can use the array of the previous example to test your program, however, I suggest that you also use other input arrays to validate the correctness and efficiency of your solution. Your program MUST be submitted only in source code form (java file). A program that does not compile or does not run loses all correctness points