hillclimb.shesc goes back
labs-40
A ±1 sequence of length 40 with the least autocorrelation sidelobe energy. This is the problem by hand: what a search moves, you move.
Click a cell to flip its spin; drag to paint. The bars underneath are the autocorrelations the energy sums the squares of. i inverts, r reverses, a alternates signs — all three keep the energy. ⌘Z undoes.