var assert = require('assert');

​

function inOrder(root) {}

​

function twoSumFromBST(root, target) {

  // Fill in this method

  return root;

}

​

class Node {

  constructor(val) {

    this.value = val;

    this.left = null;

    this.right = null;

  }

}

​

function Node(val) {

  this.val = val;

  this.left = null;

  this.right = null;

}

​

// Regular binary trees

var tree1 = new Node(4);

tree1.left = new Node(1);

tree1.right = new Node(3);