2-4. Given an array of integers, write a function to determine its maximum and minimum elements and then return their sum. Your function must call separate functions to identify the maximum and minimum elements. If the length is O or negative each function must return -1 as its result. Signature: int summin and max(int integers, int length) Signature: int max integer int integers, int length) Signature: int min integerCint integers, int length)