Given a grid where each entry is only 0 or 1, find the number of corner rectangles. A corner rectangle is 4 distinct 1s on the ...

Rectangle intersects logic is wrong as follows: First check of Y checks if rec1 top right y is less than rec2 bottom left y.

I'm learning Java by writing a Mandelbrot program. I can draw the image, then use the mouse to choose an area to magnify.