摘要： DescriptionAny square grid can be viewed as one or more rings, one inside the other. For example, as shown in figure (a), a 5 X 5 grid is made of three rings, numbered 1,2 and 3 (from outside to inside.) A square grid of size N is said to be sorted, if it includes the values from 1 to N2 in a row-ma 阅读全文