Guys, why don't we do something like this :

1. If (arrayHasBeenTraversed, Goto 4).
    Else, Traverse the 2-D array [row,column] wise. Inspect element
array[row][column]. Goto 2.
2. If you encounter a '1' (array[row][column]),
    change all the 0's in the corresponding [row,column] to '-1'
    Also, don't do anything if you encounter a '1'.
3. Goto 1.
4. Scan the array, change all '-1s' to 1s. Finish.

Send your comment.

Cheers,
Amit

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