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[LintCode] Submatrix Sum 子矩阵之和

 

Given an integer matrix, find a submatrix where the sum of numbers is zero. Your code should return the coordinate of the left-up and right-down number.

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Example

Given matrix

[  [1 ,5 ,7],  [3 ,7 ,-8],  [4 ,-8 ,9],]

return [(1,1), (2,2)]

Challenge 

O(n3) time.

 

[LintCode] Submatrix Sum 子矩阵之和