Binary Tree creation 8 / \ / \ 6 5 / \ / \ / \ / \ 6 7 3 9
let root = newNode ( 8 ) ; root . left = newNode ( 6 ) ; root . right = newNode ( 5 ) ; root . left . left = newNode ( 6 ) ; root . left . right = newNode ( 7 ) ; root . right . left = newNode ( 3 ) ; root . right . right = newNode ( 9 ) ; let minNodeVal = Number . MAX_VALUE ; ans = 0 ;