Returns the number of triples (i, j, k) with i < j < k such that a[i] + a[j] + a[k] == 0.

Reads in a sequence of distinct integers from a file, specified as a command-line argument; counts the number of triples sum to exactly zero; prints out the time to perform the computation.

Prints to standard output the (i, j, k) with i < j < k such that a[i] + a[j] + a[k] == 0.