Stores the X and Y coordinates
X = [ ] NEW_LINE Y = [ ] NEW_LINE for i in range ( 0 , N ) : NEW_LINE INDENT X . append ( x1 [ i ] ) NEW_LINE X . append ( x2 [ i ] - 1 ) NEW_LINE Y . append ( y1 [ i ] ) NEW_LINE Y . append ( y2 [ i ] - 1 ) NEW_LINE DEDENT