Fair Distribution

You are given with N boxes and you have to distribute balls to the N boxes placed in a straight line. Each ith box(where 1 ≤ i ≤ N) already has Bi balls. Balls must be distributed according to the following rules. - Every time you distribute a ball to some box i, you must also give a ball to the box immediately infront of or behind it(i.e., i+1 or i-1). - After all the balls are distributed, eac