[第二轮] 2/18-2/24 CareerCup 1.7

https://gist.github.com/KainuoYU/5038126

Use hashset to store the row and column number if an element is zero, and set the elements in that row or that column to be 0

1 remember the row and column where element = 0
2 restMatrix

time O(MN)
https://gist.github.com/sunxw/5039451

https://gist.github.com/flatlight/5056409

https://gist.github.com/ShaneLittleton/5174768

This is my solution

https://gist.github.com/5297994.git

https://gist.github.com/davidzeyuwang/5654681
来晚了...可那又怎么样呢