🏙️ Skyline

Each row and column must contain buildings of heights 1 to N exactly once (like Sudoku).

Numbers around the grid show how many buildings are visible from that direction.

Taller buildings block shorter ones behind them. A building is visible only if taller than all before it.

Clue of 1 → tallest building is first. Clue of N → buildings in order 1,2,…,N.