starmsg的专栏

Imagine there is a square matrix with n x n cells. Each cell is either filled with a black pixel or a white pixel. Design an algorithm to find the maximum Subsquare such that all four borders are fill

problem source:  http://www.careercup.com/question?id=21117662

1. Write a function that returns a node in a tree given two parameters:  pointer to the root node and the in order traversal number of the node we  want to return. The only information stored in the