Visible-Count Bound
Medium
Used by Smart Hint
A clue of k means the tallest building can't sit within the first k-1 cells from that edge — eliminate it there.
- Cells that establish the pattern
- Height ruled out
How it works
- The 3 on the left says three buildings are visible along this row.
- Once the tallest (4) appears, nothing behind it shows — so all three visible buildings must appear by the 4's own position.
- If the 4 sat in the first or second cell, at most one or two buildings could show. Strike 4 from both.