Myfmt

Author: Song Li

##AIM##
This program is use to do text format things. Users can use this program to limit the width of every line into a particular length and can uniform every blanks.

Maximal Square

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing all 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

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