USACO silver problem mountain view has weak test cases
usaco 2019 january silver contest problem- Mountain View.

This problem has weak test cases.
I submitted a solution with complexity of O(n^2) and it worked. I don’t think it should be that way.
The official solution has a complexity of O(nlogn) and it’s very elegant.

It should be fixed for future users.

USACO test cases are never changed after contest results are out.

Do you happen to know why they do not change ??

I’m not aware of any contest site that changes test data after contest results are finalized (aside from CodeForces).