What is the complexity of this code ?

Revision en2, by SPyofgame, 2020-12-04 04:18:26

The problem

Given $$$n$$$ points $$$(x_1, y_1),\ (x_2, y_2),\dots, (x_n, y_n)$$$

Find the minimum distance between 2 pair of points.

The problem: SPOJ

The constraint

  • $$$2 \leq n \leq 50000$$$

  • $$$x_i, y_i \leq 10^6$$$

My question

I was solving a problem that need to find the minimum distance between two points. I tried to bruteforce then cde an divide and conquer algorithm. But then I modified the bruteforce by adding some branch-and-bound to ignore not-optimal cases. For somehow my code get AC and seems to run fast while I thought it will be slow with the complexity of $$$O(n^2)$$$ with small constant.

I dont really sure about the complexity, can some one help me to calculate it ?

My main part
My full code


  Rev. Lang. By When Δ Comment
en2 English SPyofgame 2020-12-04 04:18:26 391
en1 English SPyofgame 2020-12-04 04:14:18 4479 Initial revision (published)