897-increasing-order-search-tree

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js

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {TreeNode} root
 * @return {TreeNode}
 */

var increasingBST = function(root, tail=null ) {
    if(!root){return tail}
    let left = increasingBST(root.left,root);
    root.left = null;
    root.right = increasingBST(root.right,tail);
    return left;
};