You are given an array of integers and must compute the maximum difference between any item and any lower indexed smaller item for all the possible pairs, ie, for a given array a find the maximum value of ob- for all / where 0 sicj... Complete the 'maxDifference' function below. * The function is expected to return an INTEGER * The function accepts INTEGER ARRAY a as parameter. 17 int maxDifference(vector int> a) { 18 19 ) 20 21 int main()<>