There is a Wcm x Hcm paper grid. Each grid is 1cm x 1cm. Suppose that you were going to cut out and use each of the 1cm x 1cm square grid, but someone cut the paper diagonally so you now have two right-triangle paper pieces. You don’t have another piece of grid paper, so you decide to use the two triangle paper pieces.
Given W and H, write a solution function that returns the number of 1 x 1 squares that you can use.

  • W and H are integers. 1 ≤ W, H ≤ 100,000,000


W H result
8 12 80

Example #1

The size of the paper board is 8 x 12. With this rectangle, you can make 96 squares. But, by cutting the paper board diagonally, 16 squares turns into 32 triangles. So you can get (96 - 16 = 80) squares.


Result Stop
내가 제출한 코드가 왜 틀렸는지 프로그래머스 AI에게 물어보세요.
제출 후 채점하기를 눌러 30점 이상인 경우 물어볼 수 있어요.
베타 기간 동안에는 한 문제당 1번만 물어볼 수 있어요.