This is a fun problem to play with. Like others, I've been trying the general approach of generating random configurations, then iterating by swapping pairs of

This is a fun problem to play with. Like others, I've been trying the general approach of generating random configurations, then iterating by swapping pairs of elements (each time choosing the pair that yields the best local improvement). Lowest value found, has vertical symmetry (notice how (1,24), (2,23), (3,22), (4,21) and so on are paired) [[14 7 19 12 5 17] [21 9 2 24 22 10] [ 4 16 23 1 3 15] [11 18 6 13 20 8]] 375.923809971073 Highest value found, has rotational symmetry (see how the path from 1-24 is almost like a squished Hilbert curve) [[ 6 7 10 11 23 24] [ 5 8 9 12 22 21] [ 4 3 13 16 17 20] [ 1 2 14 15 18 19]] 529.6200384399018 Code is at https://gist.github.com/jffry/fab43b5b65499c3f513fea701597806b https://gist.github.com/jffry/fab43b5b65499c3f513fea70159780.... Probably full of new-to-Rust mistakes, so please let me know where I've strayed from the light if you're particular about Rust! As mentioned elsewhere I'm very curious about how this generalizes to grid sizes other than 6x4