With candidates, the first pass already tested only the 32-column blocks within reach of a candidate,
but still slid the horizontal window across every column of every row. It now slides it only over
the runs of needed blocks, starting each run from the vertical sums it covers - integers, so the same
window sums - and sets the bits there directly; the rest stay 0 as before.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D1G8gJVAy6gp1K5Dz3NE5C
leonarski_fandClaude Opus 5.5
d3afe0cb07