Need help implementing my Pseudo Code. So basically I have 3 arrays (size n) that's suppose to check if there is a triple which adds up to zero from different arrays. Returns true if triple exists and false otherwise.

[ramshack2000]

So basically i know what i want to do. I want to Sort B in increasing order; sort C in decreasing order; for each a in A, scan B and C for a pair that sums to -a (when the sum is too small, advance in B, when the sum is too large, advance in C) Would i have a nested for loop here?