Unfold a 2-D matrix to a 1-D array in zig-zag order, e.g., for matrix
[ 1 2 3 ;
4 5 6 ;
7 8 9 ]
the resulting 1-D array should be
[ 1 2 4 7 5 3 6 8 9 ]
Number of 1s in the Binary Representation of a Number
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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