Let us construct the tree given in the above diagram
let root = new Node ( 20 ) ; root . left = new Node ( 8 ) ; root . left . left = new Node ( 4 ) ; root . left . right = new Node ( 12 ) ; root . left . right . left = new Node ( 10 ) ; root . left . right . right = new Node ( 14 ) ; root . right = new Node ( 22 ) ; root . right . right = new Node ( 25 ) ; document . write ( " " + " " + LISS ( root ) ) ;