Quick Sort (Mini Puzzles Series #27)

This Puzzle type appeared in Oguz Atay Puzzle Contest (OAPC)-1 championship. There are two puzzles I created of this type. This is an easy puzzle which I am re-posting as 27th puzzle in Mini Puzzles Series. Can you solve this Quick Sort puzzle?

Rules of Quick Sort puzzle

Blacken some cells in the diagram so that there is only one blackened square in every outlined region. Black squares cannot touch each other from the side and all the white cells must be interconnected. Numbers in the diagram indicate the amount of the white cells seen from that square (in four directions) including it-selves. Square with number cannot be blackened.