I was defenitely not prepared, have no hopes of moving to onsites. Will prepare and give next year.

You're working on a data storage system that represents information in a binary grid. For error correction and symmetry, every row and column must be a palindrome.

Additionally, due to hardware constraints, the total number of 1s must be divisible by 4.

You’re allowed to flip any bits (0 -> 1). Return the minimum number of flips needed to make the grid valid.

grid = [[1, 0, 1],[0, 1, 0],[1, 0, 0]]

4