MAD ART

Rishi always watches a show named MAD ART. He found a whiteboard of dimensions **N** and **M** denoting height and width. It looked so dull, he wanted to make it colorful by painting it with oil paints. He tries to imagine a matrix of **N** x **M** segments in it. He wants to paint **Ri** segments in each row, also he wants only **Ci** segments to be painted in each column. other segments remai