Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Example 1:
Input:
[
["1","0","1","0","0"],
["1","0","1","1","1"],
["1","1","1","1","1"],
["1","0","0","1","0"]
]
Output: 6
Tags: Math, String
返回三角形最小面积
DP
思路2 ```go
```
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