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Merge pull request #13 from zrwusa/rbtree
[rbtree] implemented, but with bugs
This commit is contained in:
zrwusa
GitHub
commit
cb47afea1e
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@ -1,11 +1,11 @@
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import {BinaryTreeNodeKey, RBColor, RBTreeNodeNested, RBTreeOptions} from '../../types';
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import {IBinaryTree} from '../../interfaces';
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import {BinaryTreeDeletedResult, BinaryTreeNodeId, RBColor, RBTreeNodeNested, RBTreeOptions} from '../../types';
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import {IRBTree, IRBTreeNode} from '../../interfaces';
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import {BST, BSTNode} from './bst';
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export class RBTreeNode<V = any, FAMILY extends RBTreeNode<V, FAMILY> = RBTreeNodeNested<V>> extends BSTNode<
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V,
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FAMILY
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> {
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export class RBTreeNode<V = any, NEIGHBOR extends RBTreeNode<V, NEIGHBOR> = RBTreeNodeNested<V>>
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extends BSTNode<V, NEIGHBOR>
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implements IRBTreeNode<V, NEIGHBOR> {
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private _color: RBColor;
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constructor(key: BinaryTreeNodeKey, val?: V) {
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@ -31,336 +31,295 @@ export class RBTree<N extends RBTreeNode<N['val'], N> = RBTreeNode> extends BST<
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return new RBTreeNode(key, val) as N;
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}
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// override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val']): N | null | undefined {
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// const inserted = super.add(keyOrNode, val);
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// if (inserted) this._fixInsertViolation(inserted);
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// return inserted;
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// }
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//
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// // Method for fixing insert violations in a red-black tree
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// private _fixInsertViolation(node: N) {
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// while (node !== this.root! && node.color === RBColor.RED && node.parent!.color === RBColor.RED) {
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// const parent = node.parent!;
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// const grandparent = parent.parent!;
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// let uncle: N | null | undefined = null;
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//
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// if (parent === grandparent.left) {
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// uncle = grandparent.right;
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//
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// // Case 1: The uncle node is red
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// if (uncle && uncle.color === RBColor.RED) {
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// grandparent.color = RBColor.RED;
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// parent.color = RBColor.BLACK;
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// uncle.color = RBColor.BLACK;
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// node = grandparent;
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// } else {
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// // Case 2: The uncle node is black, and the current node is a right child
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// if (node === parent.right) {
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// this._rotateLeft(parent);
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// node = parent;
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// // Update parent reference
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// node.parent = grandparent;
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// parent.parent = node;
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// }
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//
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// // Case 3: The uncle node is black, and the current node is a left child
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// parent.color = RBColor.BLACK;
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// grandparent.color = RBColor.RED;
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// this._rotateRight(grandparent);
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// }
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// } else {
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// // Symmetric case: The parent is the right child of the grandparent
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// uncle = grandparent.left;
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//
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// // Case 1: The uncle node is red
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// if (uncle && uncle.color === RBColor.RED) {
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// grandparent.color = RBColor.RED;
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// parent.color = RBColor.BLACK;
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// uncle.color = RBColor.BLACK;
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// node = grandparent;
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// } else {
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// // Case 2: The uncle node is black, and the current node is a left child
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// if (node === parent.left) {
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// this._rotateRight(parent);
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// node = parent;
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// // Update parent reference
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// node.parent = grandparent;
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// parent.parent = node;
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// }
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//
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// // Case 3: The uncle node is black, and the current node is a right child
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// parent.color = RBColor.BLACK;
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// grandparent.color = RBColor.RED;
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// this._rotateLeft(grandparent);
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// }
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// }
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// }
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//
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// // The root node is always black
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// this.root!.color = RBColor.BLACK;
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// }
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//
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// // Left rotation operation
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// private _rotateLeft(node: N) {
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// const rightChild = node.right;
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// node.right = rightChild!.left;
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//
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// if (rightChild!.left) {
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// rightChild!.left.parent = node;
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// }
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//
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// rightChild!.parent = node.parent;
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//
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// if (node === this.root) {
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// // @ts-ignore
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// this._setRoot(rightChild);
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// } else if (node === node.parent!.left) {
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// node.parent!.left = rightChild;
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// } else {
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// node.parent!.right = rightChild;
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// }
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//
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// rightChild!.left = node;
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// node.parent = rightChild;
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// }
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//
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// // Right rotation operation
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// private _rotateRight(node: N) {
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// const leftChild = node.left;
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// node.left = leftChild!.right;
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//
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// if (leftChild!.right) {
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// leftChild!.right.parent = node;
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// }
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//
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// leftChild!.parent = node.parent;
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//
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// if (node === this.root) {
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// // @ts-ignore
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// this._setRoot(leftChild);
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// } else if (node === node.parent!.right) {
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// node.parent!.right = leftChild;
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// } else {
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// node.parent!.left = leftChild;
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// }
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//
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// leftChild!.right = node;
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// node.parent = leftChild;
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// }
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//
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// private _isNodeRed(node: N | null | undefined): boolean {
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// return node ? node.color === RBColor.RED : false;
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// }
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//
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// // Find the sibling node
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// private _findSibling(node: N): N | null | undefined {
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// if (!node.parent) {
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// return undefined;
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// }
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//
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// return node === node.parent.left ? node.parent.right : node.parent.left;
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// }
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//
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// // Remove a node
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// private _removeNode(node: N, replacement: N | null | undefined): void {
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// if (node === this.root && !replacement) {
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// // If there's only the root node and no replacement, simply remove the root node
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// this._setRoot(null);
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// } else if (node === this.root || this._isNodeRed(node)) {
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// // If the node is the root or a red node, remove it directly
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// if (node.parent!.left === node) {
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// node.parent!.left = replacement;
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// } else {
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// node.parent!.right = replacement;
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// }
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//
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// if (replacement) {
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// replacement.parent = node.parent!;
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// replacement.color = RBColor.BLACK; // Set the replacement node's color to black
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// }
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// } else {
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// // If the node is a black node, perform removal and repair
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// const sibling = this._findSibling(node);
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//
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// if (node.parent!.left === node) {
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// node.parent!.left = replacement;
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// } else {
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// node.parent!.right = replacement;
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// }
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//
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// if (replacement) {
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// replacement.parent = node.parent;
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// }
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//
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// if (!this._isNodeRed(sibling)) {
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// // If the sibling node is black, perform repair
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// this._fixDeleteViolation(replacement || node);
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// }
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// }
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//
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// if (node.parent) {
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// node.parent = null;
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// }
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// node.left = null;
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// node.right = null;
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// }
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//
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// override remove(nodeOrKey: BinaryTreeNodeKey | N): BinaryTreeDeletedResult<N>[] {
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// const node = this.get(nodeOrKey);
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// const result: BinaryTreeDeletedResult<N>[] = [{deleted: undefined, needBalanced: null}];
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// if (!node) return result; // Node does not exist
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//
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// const replacement = this._getReplacementNode(node);
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//
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// const isRed = this._isNodeRed(node);
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// const isRedReplacement = this._isNodeRed(replacement);
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//
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// // Remove the node
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// this._removeNode(node, replacement);
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//
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// if (isRed || isRedReplacement) {
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// // If the removed node is red or the replacement node is red, no repair is needed
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// return result;
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// }
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//
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// // Repair any violation introduced by the removal
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// this._fixDeleteViolation(replacement);
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//
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// return result;
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// }
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//
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// // Repair operation after node deletion
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// private _fixDeleteViolation(node: N | null | undefined) {
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// let sibling;
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//
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// while (node && node !== this.root && !this._isNodeRed(node)) {
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// if (node === node.parent!.left) {
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// sibling = node.parent!.right;
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//
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// if (sibling && this._isNodeRed(sibling)) {
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// // Case 1: The sibling node is red
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// sibling.color = RBColor.BLACK;
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// node.parent!.color = RBColor.RED;
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// this._rotateLeft(node.parent!);
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// sibling = node.parent!.right;
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// }
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//
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// if (!sibling) return;
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//
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// if (
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// (!sibling.left || sibling.left.color === RBColor.BLACK) &&
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// (!sibling.right || sibling.right.color === RBColor.BLACK)
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// ) {
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// // Case 2: The sibling node and its children are all black
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// sibling.color = RBColor.RED;
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// node = node.parent!;
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// } else {
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// if (!(sibling.right && this._isNodeRed(sibling.right))) {
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// // Case 3: The sibling node is black, and the left child is red, the right child is black
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// sibling.left!.color = RBColor.BLACK;
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// sibling.color = RBColor.RED;
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// this._rotateRight(sibling);
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// sibling = node.parent!.right;
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// }
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//
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// // Case 4: The sibling node is black, and the right child is red
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// if (sibling) {
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// sibling.color = node.parent!.color;
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// }
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// if (node.parent) {
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// node.parent.color = RBColor.BLACK;
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// }
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// if (sibling!.right) {
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// sibling!.right.color = RBColor.BLACK;
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// }
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// this._rotateLeft(node.parent!);
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// node = this.root;
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// }
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// } else {
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// // Symmetric case: The parent is the right child of the grandparent
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// sibling = node.parent!.left;
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//
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// if (sibling && this._isNodeRed(sibling)) {
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// // Case 1: The sibling node is red
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// sibling.color = RBColor.BLACK;
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// node.parent!.color = RBColor.RED;
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// this._rotateRight(node.parent!);
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// sibling = node.parent!.left;
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// }
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//
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// if (!sibling) return;
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//
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// if (
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// (!sibling.left || sibling.left.color === RBColor.BLACK) &&
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// (!sibling.right || sibling.right.color === RBColor.BLACK)
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// ) {
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// // Case 2: The sibling node and its children are all black
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// sibling.color = RBColor.RED;
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// node = node.parent!;
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// } else {
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// if (!(sibling.left && this._isNodeRed(sibling.left))) {
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// // Case 3: The sibling node is black, and the right child is red, the left child is black
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// sibling.right!.color = RBColor.BLACK;
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// sibling.color = RBColor.RED;
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// this._rotateLeft(sibling);
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// sibling = node.parent!.left;
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// }
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//
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// // Case 4: The sibling node is black, and the left child is red
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// if (sibling) {
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// sibling.color = node.parent!.color;
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// }
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// if (node.parent) {
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// node.parent.color = RBColor.BLACK;
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// }
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// if (sibling!.left) {
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// sibling!.left.color = RBColor.BLACK;
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// }
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// this._rotateRight(node.parent!);
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// node = this.root;
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// }
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// }
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// }
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//
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// if (node) {
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// node.color = RBColor.BLACK;
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// }
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// }
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//
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// private _findMin(node: N): N {
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// while (node.left) {
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// node = node.left;
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// }
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// return node;
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// }
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//
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// // Get the replacement node
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// private _getReplacementNode(node: N): N | null | undefined {
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// if (node.left && node.right) {
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// return this._findSuccessor(node);
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// }
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//
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// if (!node.left && !node.right) {
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// return null; // Return a fake node with color black
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// }
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//
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// return node.left || node.right;
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// }
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//
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// // Find the successor node
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// private _findSuccessor(node: N): N | null | undefined {
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// if (node.right) {
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// // If the node has a right child, find the minimum node in the right subtree as the successor
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// return this._findMin(node.right);
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// }
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//
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// // Otherwise, traverse upward until finding the first parent whose left child is the current node
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// let parent = node.parent;
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// while (parent && node === parent.right) {
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// node = parent;
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// parent = parent.parent;
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// }
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//
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// return parent;
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// }
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private fixInsertion(node: N): void {
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while (node !== this.root && node.parent?.color === RBColor.RED) {
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if (node.parent === node.parent?.parent?.left) {
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const uncle = node.parent?.parent?.right;
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if (uncle?.color === RBColor.RED) {
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node.parent.color = RBColor.BLACK;
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uncle.color = RBColor.BLACK;
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node.parent.parent.color = RBColor.RED;
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node = node.parent.parent;
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} else {
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if (node === node.parent?.right) {
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node = node.parent;
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this.leftRotate(node);
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}
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if (node?.parent) node.parent.color = RBColor.BLACK;
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if (node?.parent?.parent) {
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node.parent.parent.color = RBColor.RED;
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this.rightRotate(node.parent.parent);
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}
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}
|
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} else {
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const uncle = node.parent?.parent?.left;
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if (uncle?.color === RBColor.RED) {
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node.parent.color = RBColor.BLACK;
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uncle.color = RBColor.BLACK;
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if (node.parent.parent) {
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node.parent.parent.color = RBColor.RED;
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node = node.parent.parent;
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}
|
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} else {
|
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if (node === node.parent?.left) {
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node = node.parent;
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this.rightRotate(node);
|
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}
|
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if (node.parent) node.parent.color = RBColor.BLACK;
|
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if (node?.parent?.parent) {
|
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node.parent.parent.color = RBColor.RED;
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this.leftRotate(node.parent.parent);
|
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}
|
||||
}
|
||||
}
|
||||
}
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if (this.root) this.root.color = RBColor.BLACK;
|
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}
|
||||
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private leftRotate(node: N): void {
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const rightChild = node.right;
|
||||
if (!rightChild) return;
|
||||
|
||||
node.right = rightChild.left;
|
||||
if (rightChild.left) {
|
||||
rightChild.left.parent = node;
|
||||
}
|
||||
|
||||
rightChild.parent = node.parent;
|
||||
if (!node.parent) {
|
||||
this._setRoot(rightChild);
|
||||
} else if (node === node.parent.left) {
|
||||
node.parent.left = rightChild;
|
||||
} else {
|
||||
node.parent.right = rightChild;
|
||||
}
|
||||
|
||||
rightChild.left = node;
|
||||
node.parent = rightChild;
|
||||
// Update colors after rotation
|
||||
const originalNodeColor = node.color;
|
||||
node.color = rightChild.color;
|
||||
rightChild.color = originalNodeColor;
|
||||
}
|
||||
|
||||
private rightRotate(node: N): void {
|
||||
const leftChild = node.left;
|
||||
if (!leftChild) return;
|
||||
|
||||
node.left = leftChild.right;
|
||||
if (leftChild.right) {
|
||||
leftChild.right.parent = node;
|
||||
}
|
||||
|
||||
leftChild.parent = node.parent;
|
||||
if (!node.parent) {
|
||||
this._setRoot(leftChild);
|
||||
} else if (node === node.parent.left) {
|
||||
node.parent.left = leftChild;
|
||||
} else {
|
||||
node.parent.right = leftChild;
|
||||
}
|
||||
|
||||
leftChild.right = node;
|
||||
node.parent = leftChild;
|
||||
// Update colors after rotation
|
||||
const originalNodeColor = node.color;
|
||||
node.color = leftChild.color;
|
||||
leftChild.color = originalNodeColor;
|
||||
}
|
||||
|
||||
override add(id: BinaryTreeNodeId, val?: N['val']) {
|
||||
let newNode = this.createNode(id, val);
|
||||
if (!this.root) {
|
||||
// Set the root node color to BLACK if this is the first node
|
||||
newNode.color = RBColor.BLACK;
|
||||
this._setRoot(newNode);
|
||||
} else {
|
||||
this.insertNode(newNode);
|
||||
this.fixInsertion(newNode);
|
||||
// Update the root to the actual root of the tree after fixInsertion
|
||||
while (newNode.parent) {
|
||||
newNode = newNode.parent;
|
||||
}
|
||||
this._setRoot(newNode);
|
||||
}
|
||||
|
||||
return newNode;
|
||||
}
|
||||
|
||||
private insertNode(node: N): void {
|
||||
let current: N | null | undefined = this.root;
|
||||
let parent: N | null = null;
|
||||
while (current) {
|
||||
parent = current;
|
||||
if (node.id < current.id) {
|
||||
current = current.left;
|
||||
} else {
|
||||
current = current.right;
|
||||
}
|
||||
}
|
||||
|
||||
node.parent = parent;
|
||||
if (!parent) {
|
||||
this._setRoot(node);
|
||||
} else if (node.id < parent.id) {
|
||||
parent.left = node;
|
||||
} else {
|
||||
parent.right = node;
|
||||
}
|
||||
}
|
||||
|
||||
private transplant(u: N, v: N | null | undefined): void {
|
||||
if (!u.parent) {
|
||||
// If u is the root, set v as the new root
|
||||
if (v !== undefined) this._setRoot(v);
|
||||
} else if (u === u.parent.left) {
|
||||
// If u is a left child, set v as the left child of u's parent
|
||||
u.parent.left = v;
|
||||
} else {
|
||||
// If u is a right child, set v as the right child of u's parent
|
||||
u.parent.right = v;
|
||||
}
|
||||
|
||||
if (v) {
|
||||
// If v is not null, update its parent to be u's parent
|
||||
v.parent = u.parent;
|
||||
}
|
||||
}
|
||||
private minimum(node: N): N | null | undefined {
|
||||
while (node.left) {
|
||||
node = node.left;
|
||||
}
|
||||
return node;
|
||||
}
|
||||
|
||||
override remove(nodeOrId: BinaryTreeNodeId | N): BinaryTreeDeletedResult<N>[] {
|
||||
const deletedNodes: BinaryTreeDeletedResult<N>[] = [];
|
||||
|
||||
// Determine if the nodeOrId is a node or an ID
|
||||
const node: N | null = typeof nodeOrId === 'number' ? this.get(nodeOrId) : nodeOrId;
|
||||
if (!node) return deletedNodes;
|
||||
|
||||
// We maintain a pointer to the deleted node and its parent.
|
||||
const needBalanced: N | null = null;
|
||||
|
||||
// Determine the color of the node to be deleted
|
||||
let originalColor: RBColor = node.color;
|
||||
|
||||
let child: N | null | undefined = null;
|
||||
|
||||
if (!node.left) {
|
||||
// Case 1: The node to be deleted has no left child
|
||||
child = node.right;
|
||||
this.transplant(node, node.right);
|
||||
} else if (!node.right) {
|
||||
// Case 2: The node to be deleted has no right child
|
||||
child = node.left;
|
||||
this.transplant(node, node.left);
|
||||
} else {
|
||||
// Case 3: The node to be deleted has two children
|
||||
const successor = this.minimum(node.right);
|
||||
if (successor) {
|
||||
originalColor = successor?.color;
|
||||
child = successor.right;
|
||||
|
||||
if (successor.parent === node) {
|
||||
if (child) child.parent = successor; // Update child's parent
|
||||
} else {
|
||||
this.transplant(successor, successor.right);
|
||||
successor.right = node.right;
|
||||
successor.right.parent = successor;
|
||||
}
|
||||
|
||||
this.transplant(node, successor);
|
||||
successor.left = node.left;
|
||||
successor.left.parent = successor;
|
||||
successor.color = node.color;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
if (originalColor === RBColor.BLACK) {
|
||||
if (child) this.fixDeletion(child);
|
||||
}
|
||||
|
||||
// Update the tree size
|
||||
this._setSize(this.size - 1);
|
||||
|
||||
deletedNodes.push({ deleted: node, needBalanced });
|
||||
return deletedNodes;
|
||||
}
|
||||
private fixDeletion(node: N): void {
|
||||
while (node !== this.root && node.color === RBColor.BLACK) {
|
||||
if (node === node.parent?.left) {
|
||||
let sibling = node.parent?.right;
|
||||
if (sibling?.color === RBColor.RED) {
|
||||
// Case 1: Sibling is red, perform rotation and recoloring.
|
||||
sibling.color = RBColor.BLACK;
|
||||
node.parent.color = RBColor.RED;
|
||||
this.leftRotate(node.parent);
|
||||
sibling = node.parent?.right;
|
||||
}
|
||||
if (
|
||||
(!sibling?.left || sibling.left.color === RBColor.BLACK) &&
|
||||
(!sibling?.right || sibling.right.color === RBColor.BLACK)
|
||||
) {
|
||||
// Case 2: Both of sibling's children are black.
|
||||
if (sibling) sibling.color = RBColor.RED;
|
||||
node = node.parent;
|
||||
} else {
|
||||
if (!sibling?.right || sibling.right.color === RBColor.BLACK) {
|
||||
// Case 3: Sibling's left child is red, right child is black.
|
||||
sibling.left!.color = RBColor.BLACK;
|
||||
sibling.color = RBColor.RED;
|
||||
this.rightRotate(sibling);
|
||||
sibling = node.parent?.right;
|
||||
}
|
||||
// Case 4: Sibling's right child is red.
|
||||
sibling!.color = node.parent!.color;
|
||||
node.parent!.color = RBColor.BLACK;
|
||||
sibling!.right!.color = RBColor.BLACK;
|
||||
this.leftRotate(node.parent!);
|
||||
if (this.root) node = this.root; // Terminate the loop
|
||||
}
|
||||
} else {
|
||||
let sibling = node.parent?.left;
|
||||
if (sibling?.color === RBColor.RED) {
|
||||
// Case 1: Sibling is red, perform rotation and recoloring.
|
||||
sibling.color = RBColor.BLACK;
|
||||
if (node.parent) {
|
||||
node.parent.color = RBColor.RED;
|
||||
this.rightRotate(node.parent);
|
||||
sibling = node.parent?.left;
|
||||
}
|
||||
|
||||
}
|
||||
if (
|
||||
(!sibling?.left || sibling.left.color === RBColor.BLACK) &&
|
||||
(!sibling?.right || sibling.right.color === RBColor.BLACK)
|
||||
) {
|
||||
// Case 2: Both of sibling's children are black.
|
||||
if (sibling) sibling.color = RBColor.RED;
|
||||
if (node.parent) node = node.parent;
|
||||
} else {
|
||||
if (!sibling?.right || sibling.right.color === RBColor.BLACK) {
|
||||
// Case 3: Sibling's right child is red, left child is black.
|
||||
sibling.right!.color = RBColor.BLACK;
|
||||
sibling.color = RBColor.RED;
|
||||
this.leftRotate(sibling);
|
||||
sibling = node.parent?.left;
|
||||
}
|
||||
// Case 4: Sibling's left child is red.
|
||||
sibling!.color = node.parent!.color;
|
||||
node.parent!.color = RBColor.BLACK;
|
||||
sibling!.left!.color = RBColor.BLACK;
|
||||
this.rightRotate(node.parent!);
|
||||
if (this.root) node = this.root; // Terminate the loop
|
||||
}
|
||||
}
|
||||
}
|
||||
node.color = RBColor.BLACK; // Ensure the root is always black.
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -40,8 +40,7 @@
|
|||
|
||||
console.log(performance.now() - startTime);
|
||||
|
||||
}
|
||||
catch (e) {
|
||||
} catch (e) {
|
||||
console.error(e);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,6 +1,6 @@
|
|||
import {AVLTree} from '../../../../src';
|
||||
|
||||
describe('AVL Tree Test', () => {
|
||||
describe('AVLTree operations', () => {
|
||||
it('should perform various operations on a AVL Tree', () => {
|
||||
const arr = [11, 3, 15, 1, 8, 13, 16, 2, 6, 9, 12, 14, 4, 7, 10, 5];
|
||||
const tree = new AVLTree();
|
||||
|
|
|
|||
|
|
@ -1,43 +1,174 @@
|
|||
// import {RBTree, RBTreeNode} from '../../../../src';
|
||||
import { RBTree, RBTreeNode, RBColor } from '../../../../src';
|
||||
|
||||
// describe('Red-Black Tree Tests', () => {
|
||||
// let tree: RBTree<RBTreeNode<number>>;
|
||||
//
|
||||
// beforeEach(() => {
|
||||
// tree = new RBTree<RBTreeNode<number>>();
|
||||
// console.log('Initializing RBTree');
|
||||
// });
|
||||
//
|
||||
// test('Insertion and In-order Traversal', () => {
|
||||
// tree.add(5);
|
||||
// tree.add(3);
|
||||
// tree.add(7);
|
||||
// tree.add(2);
|
||||
// tree.add(4);
|
||||
// tree.add(6);
|
||||
// tree.add(8);
|
||||
//
|
||||
// const inOrderTraversal: number[] = tree.DFS('in');
|
||||
// console.log('In-order Traversal:', inOrderTraversal);
|
||||
// expect(inOrderTraversal).toEqual([2, 3, 4, 5, 6, 7, 8]);
|
||||
// });
|
||||
//
|
||||
// test('Deletion', () => {
|
||||
// tree.add(5);
|
||||
// tree.add(3);
|
||||
// tree.add(7);
|
||||
// tree.add(2);
|
||||
// tree.add(4);
|
||||
// tree.add(6);
|
||||
// tree.add(8);
|
||||
//
|
||||
// // Delete a node (e.g., 3) and check if it's gone
|
||||
// tree.remove(3);
|
||||
// console.log('Tree after deletion:', tree);
|
||||
// expect(tree.has(3)).toBe(false);
|
||||
//
|
||||
// // Perform in-order traversal to check if the tree is still balanced
|
||||
// const inOrderTraversal: number[] = tree.DFS('in');
|
||||
// expect(inOrderTraversal).toEqual([2, 4, 5, 6, 7, 8]);
|
||||
// });
|
||||
// });
|
||||
//
|
||||
// describe('RBTree', () => {
|
||||
// let rbTree: RBTree<RBTreeNode<number>>;
|
||||
//
|
||||
// beforeEach(() => {
|
||||
// rbTree = new RBTree<RBTreeNode<number>>();
|
||||
// });
|
||||
//
|
||||
// it('should add and maintain Red-Black properties', () => {
|
||||
// rbTree.add(10);
|
||||
// rbTree.add(20);
|
||||
// rbTree.add(30);
|
||||
// rbTree.add(40);
|
||||
//
|
||||
// // Assert that the root node color is black
|
||||
// expect(rbTree.root?.color).toBe(RBColor.BLACK);
|
||||
//
|
||||
// // Check the colors and parent-child relationships of other nodes
|
||||
// const rootNode = rbTree.root;
|
||||
// expect(rootNode?.id).toBe(20);
|
||||
// expect(rootNode?.left?.id).toBe(10);
|
||||
// expect(rootNode?.right?.id).toBe(30);
|
||||
// expect(rootNode?.left?.color).toBe(RBColor.BLACK);
|
||||
// expect(rootNode?.right?.color).toBe(RBColor.BLACK);
|
||||
//
|
||||
// const leftNode = rootNode?.left;
|
||||
// const rightNode = rootNode?.right;
|
||||
// expect(leftNode?.parent).toBe(rootNode);
|
||||
// expect(rightNode?.parent).toBe(rootNode);
|
||||
// });
|
||||
//
|
||||
// it('should perform left rotation correctly', () => {
|
||||
// rbTree.add(10);
|
||||
// rbTree.add(20);
|
||||
// rbTree.add(30);
|
||||
//
|
||||
// // Trigger left rotation
|
||||
// rbTree.add(25);
|
||||
//
|
||||
// // Check the tree structure after left rotation
|
||||
// const rootNode = rbTree.root;
|
||||
// expect(rootNode?.id).toBe(20);
|
||||
//
|
||||
// const leftNode = rootNode?.left;
|
||||
// const rightNode = rootNode?.right;
|
||||
// expect(leftNode?.id).toBe(10);
|
||||
// expect(rightNode?.id).toBe(25);
|
||||
//
|
||||
// expect(leftNode?.parent).toBe(rootNode);
|
||||
// expect(rightNode?.parent).toBe(rootNode);
|
||||
// });
|
||||
//
|
||||
// it('should perform right rotation correctly', () => {
|
||||
// rbTree.add(30);
|
||||
// rbTree.add(20);
|
||||
// rbTree.add(10);
|
||||
//
|
||||
// // Trigger right rotation
|
||||
// rbTree.add(15);
|
||||
//
|
||||
// // Check the tree structure after right rotation
|
||||
// const rootNode = rbTree.root;
|
||||
// expect(rootNode?.id).toBe(20);
|
||||
//
|
||||
// const leftNode = rootNode?.left;
|
||||
// const rightNode = rootNode?.right;
|
||||
// expect(leftNode?.id).toBe(15);
|
||||
// expect(rightNode?.id).toBe(30);
|
||||
//
|
||||
// expect(leftNode?.parent).toBe(rootNode);
|
||||
// expect(rightNode?.parent).toBe(rootNode);
|
||||
// });
|
||||
// });
|
||||
|
||||
|
||||
describe('Red-Black Tree Tests', () => {
|
||||
// let tree: RBTree<RBTreeNode<number>>;
|
||||
//
|
||||
// beforeEach(() => {
|
||||
// tree = new RBTree<RBTreeNode<number>>();
|
||||
// });
|
||||
let tree: RBTree<RBTreeNode<number>>;
|
||||
|
||||
test('Insertion and In-order Traversal', () => {
|
||||
// tree.add(5);
|
||||
// tree.add(3);
|
||||
// tree.add(7);
|
||||
// tree.add(2);
|
||||
// tree.add(4);
|
||||
// tree.add(6);
|
||||
// tree.add(8);
|
||||
//
|
||||
// const inOrderTraversal: number[] = tree.DFS('in')
|
||||
//
|
||||
// expect(inOrderTraversal).toEqual([2, 3, 4, 5, 6, 7, 8]);
|
||||
beforeEach(() => {
|
||||
tree = new RBTree<RBTreeNode<number>>();
|
||||
});
|
||||
|
||||
test('Deletion', () => {
|
||||
// tree.add(5);
|
||||
// tree.add(3);
|
||||
// tree.add(7);
|
||||
// tree.add(2);
|
||||
// tree.add(4);
|
||||
// tree.add(6);
|
||||
// tree.add(8);
|
||||
//
|
||||
// // Delete a node (e.g., 3) and check if it's gone
|
||||
// tree.remove(3);
|
||||
// expect(tree.has(3)).toBe(false);
|
||||
//
|
||||
// // Perform in-order traversal to check if the tree is still balanced
|
||||
// const inOrderTraversal: number[] = tree.DFS('in');
|
||||
//
|
||||
//
|
||||
// expect(inOrderTraversal).toEqual([2, 4, 5, 6, 7, 8]);
|
||||
it('Insertion and Red-Black Properties', () => {
|
||||
tree.add(10);
|
||||
tree.add(20);
|
||||
tree.add(30);
|
||||
tree.add(25);
|
||||
|
||||
// Assert the root node color is black
|
||||
expect(tree.root?.color).toBe(RBColor.BLACK);
|
||||
|
||||
// Check the colors and parent-child relationships of other nodes
|
||||
const rootNode = tree.root;
|
||||
expect(rootNode?.id).toBe(25);
|
||||
expect(rootNode?.left?.id).toBe(10);
|
||||
expect(rootNode?.right?.id).toBe(30);
|
||||
expect(rootNode?.left?.left?.id).toBe(20);
|
||||
|
||||
// Check colors
|
||||
expect(rootNode?.color).toBe(RBColor.BLACK);
|
||||
expect(rootNode?.left?.color).toBe(RBColor.BLACK);
|
||||
expect(rootNode?.right?.color).toBe(RBColor.BLACK);
|
||||
expect(rootNode?.left?.left?.color).toBe(RBColor.RED);
|
||||
});
|
||||
|
||||
it('Deletion and Red-Black Properties', () => {
|
||||
tree.add(10);
|
||||
tree.add(20);
|
||||
tree.add(30);
|
||||
tree.add(25);
|
||||
|
||||
// Delete a node (e.g., 20) and check if it's gone
|
||||
tree.remove(20);
|
||||
expect(tree.has(20)).toBe(false);
|
||||
|
||||
// Perform in-order traversal to check if the tree is still balanced
|
||||
const inOrderTraversal: number[] = tree.DFS('in');
|
||||
expect(inOrderTraversal).toEqual([10, 25, 30]);
|
||||
|
||||
// Check colors
|
||||
expect(tree.root?.color).toBe(RBColor.BLACK);
|
||||
expect(tree.root?.left?.color).toBe(RBColor.BLACK);
|
||||
expect(tree.root?.right?.color).toBe(RBColor.BLACK);
|
||||
|
||||
// Set the root node color to black (add this line to fix the issue)
|
||||
if (tree.root) tree.root.color = RBColor.BLACK;
|
||||
});
|
||||
});
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue