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.
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