[题目] Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area. Example: Input: 1 0 1 0 0 1 0 1 1 1 1 1 0 0 1 0 Output: 4 [思路] dp square面积和三个有关 注意特殊空集条件 [代码] class Solution { public int maximalS…