second BST
root2 = None NEW_LINE root2 = insert ( root2 , 5 ) NEW_LINE root2 = insert ( root2 , 18 ) NEW_LINE root2 = insert ( root2 , 2 ) NEW_LINE root2 = insert ( root2 , 1 ) NEW_LINE root2 = insert ( root2 , 3 ) NEW_LINE root2 = insert ( root2 , 4 ) NEW_LINE Sum = 10 NEW_LINE pairSum ( root1 , root2 , Sum ) NEW_LINE