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花花酱 LeetCode 221. Maximal Square

Problem:

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s and return its area.

For example, given the following matrix:

1 0 1 0 0
1 0 1 1 1
1 1 1 1 1
1 0 0 1 0

Return 4.

 

Idea:

Dynamic programming



Solution 0: O(n^5)

 

Solution 1: O(n^3)

Solution 2: O(n^2)

 

Solution 1:

 

Solution 2:

 

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