construct BST to Greater sum tree

Author: manju07

Data-Structure/Tree/Binary Search Tree/Construction and Conversion/BSTtoGreaterSum.js

@@ -0,0 +1,54 @@
+'use strict';
+class Node {
+    constructor(data) {
+        this.data = data;
+        this.leftNode = this.rightNode = null;
+    }
+}
+
+function insertionOfk(root, k) {
+    if (root == null) return new Node(k);
+    if (root.data > k)
+        root.leftNode = insertionOfk(root.leftNode, k);
+    else if (root.data < k)
+        root.rightNode = insertionOfk(root.rightNode, k);
+    return root;
+}
+
+function BSTtoGreaterSum(root, sumObj) {
+    if (root == null) return null;
+    BSTtoGreaterSum(root.rightNode, sumObj);
+    let tempData = sumObj.sum;
+    sumObj.sum = sumObj.sum + root.data;
+    root.data = tempData;
+    BSTtoGreaterSum(root.leftNode, sumObj);
+
+}
+
+function inorderDisplay(root, inOrderArr) {
+    if (root == null) return;
+    inorderDisplay(root.leftNode, inOrderArr);
+    inOrderArr.push(root.data);
+    inorderDisplay(root.rightNode, inOrderArr);
+}
+
+let tree = null;
+tree = insertionOfk(tree, 4);
+tree = insertionOfk(tree, 2);
+tree = insertionOfk(tree, 3);
+tree = insertionOfk(tree, 1);
+tree = insertionOfk(tree, 6);
+tree = insertionOfk(tree, 5);
+tree = insertionOfk(tree, 7);
+//  Inorder display
+let inOrderArr = [];
+inorderDisplay(tree, inOrderArr);
+console.log('Tree Inorder - ', inOrderArr.join(', '));
+
+let sumObj = { sum: 0 };
+BSTtoGreaterSum(tree, sumObj);
+
+//  Inorder display
+inOrderArr = [];
+inorderDisplay(tree, inOrderArr);
+console.log('Greater Sum Tree Inorder - ', inOrderArr.join(', '));