Geek Sundaram and his Universal fans

Problem description Geek Sundaram's ever expanding Geekdom attracts fans from remote corners of the universe (even Aliens :P). On Geek's birthday, his fans assembled in front of his house to take selfies. Since the crowd was humongous, he was not able to control the mob. He quickly came up with a way to solve this problem. He arranged them in a room of M rows and N columns and assigned them val