Don`t now how to do this. But I can tell you a substitute for this.

Implement your own struct for this. Like :

struct p{
    int a;
    int b;
    int c;
};

Write down a less than operator a separate comparator for it.

This is my code. Have a look.

My code — https://pastebin.com/BMM8f21P

Although I am having a small problem and I will be really happy if a third person can help us both. Lower bound returns the same value if its present in the query range. But in my code if I am searching {1 , 2 , 3} in the vector of particular struct, I am not getting the desired result.

I even implemented an (==) operator for this struct but it was not helpful.

What error are you actually getting? It looks to me like it should just work.

For example this doesn't error for me (with --std=c++14 if it matters):

  vector<pair<pair<int, int>, int>> v;
  lower_bound(v.begin(), v.end(), make_pair(make_pair(2, 42), 5));

I believe making a custom comparator will solve the problem!