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1.7 Write an algorithm such that if an element in an MxN matrix is 0, its entire row and column are set to 0.
LeetCode中的原题，请参见我之前的博客Set Matrix Zeroes 矩阵赋零。
[CareerCup] 1.7 Set Matrix Zeroes 矩阵赋零
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原文地址：http://www.cnblogs.com/grandyang/p/4653372.html
