Create Binary Tree as shown
let root = newNode ( 10 ) ; root . left = newNode ( 2 ) ; root . right = newNode ( 5 ) ; root . right . left = newNode ( 18 ) ; root . right . right = newNode ( 12 ) ; root . right . left . left = newNode ( 2 ) ; root . right . left . right = newNode ( 3 ) ; root . right . right . left = newNode ( 3 ) ; root . right . right . right = newNode ( 14 ) ; root . right . right . right . left = newNode ( 7 ) ;