Given an array of positive numbers, find sub-sequence of length three having maximum product. The elements of sub-sequence should be in increasing order. For example, for the input array {6, 7, 8, 1, 2, 3, 9, 10} output should be sub-sequence 8,9,10. For input array {6, 1, 2, 3, 19, 10, 7} output sub-sequence should be 2,3,19.