# 力扣221. 最大正方形


## 力扣221. Maximal Square（最大正方形）

在一个由 '0' 和 '1' 组成的二维矩阵内，找到只包含 '1' 的最大正方形并返回其面积。

示例 1：

![](../posts/01_学习/87_LeetCode/0221_最大正方形/img/0221-1-description.png)

```
输入：matrix = [["1","0","1","0","0"],["1","0","1","1","1"],["1","1","1","1","1"],["1","0","0","1","0"]]
输出：4
```

提示：
- m == matrix.length
- n == matrix[i].length
- 1 <= m, n <= 300
- matrix[i][j] 为 '0' 或 '1'