Hi! Suppose, I have several integer elements like this:

(3 9 1), (1 5 2), (2 8 3), (1 4 4), (1 6 5), (1 5 6).

Now I want to sort the elements like vector of pairs are sorted. Only difference is that instead of 2 keys we have 3 keys here. After sorting the elements will look like:

(1 4 4), (1 5 2), (1 5 6), (1 6 5), (2 8 3), (3 9 1).

Is there any STL or other techniques to achieve this? I found out about "Tuples" but having some problems to understand this well. Can you guys help me in any way please? May be by providing useful links or Explaining the process.

Thanks.. :)