Using C/C++, define an integer array (size between 10 and 20) and a target number (e.g. 50), assign the array with random numbers in between [0, 10]), then define a function to find all unique number pairs or tuples (more than 2 numbers) of the array such that the numbers of each pair/tuple add up to the target number. Note that besides printing the numbers of each pair/tuple, you are also required to print the original index information of the numbers. For example, given array A = {5, 3, 4, 2, 6, 7}, target = 9, the number pairs are (5, 4), (3, 6), (2, 7), and (3, 4, 2). Their indices are (0, 2), (1, 4), (3, 5), and (1, 2, 3), respectively.