红黑树删除 java
时间: 2023-10-26 13:28:23 浏览: 44
红黑树的删除操作相对比较复杂,需要考虑多种情况。下面是一个简单的红黑树删除的 Java 实现示例:
```java
public class RedBlackTree {
private Node root;
// 其他代码...
public void delete(int value) {
Node node = search(root, value);
if (node != null) {
deleteNode(node);
}
}
private void deleteNode(Node node) {
Node y = node;
Node x;
boolean yOriginalColor = y.isBlack();
if (node.getLeft() == null) {
x = node.getRight();
transplant(node, node.getRight());
} else if (node.getRight() == null) {
x = node.getLeft();
transplant(node, node.getLeft());
} else {
y = minimum(node.getRight());
yOriginalColor = y.isBlack();
x = y.getRight();
if (y.getParent() == node) {
if (x != null) {
x.setParent(y);
}
} else {
transplant(y, y.getRight());
y.setRight(node.getRight());
y.getRight().setParent(y);
}
transplant(node, y);
y.setLeft(node.getLeft());
y.getLeft().setParent(y);
y.setColor(node.getColor());
}
if (yOriginalColor) {
deleteFixup(x);
}
}
private void deleteFixup(Node x) {
while (x != root && x.isBlack()) {
if (x == x.getParent().getLeft()) {
Node w = x.getParent().getRight();
if (!w.isBlack()) {
w.setBlack(true);
x.getParent().setBlack(false);
leftRotate(x.getParent());
w = x.getParent().getRight();
}
if (w.getLeft().isBlack() && w.getRight().isBlack()) {
w.setBlack(false);
x = x.getParent();
} else {
if (w.getRight().isBlack()) {
w.getLeft().setBlack(true);
w.setBlack(false);
rightRotate(w);
w = x.getParent().getRight();
}
w.setBlack(x.getParent().isBlack());
x.getParent().setBlack(true);
w.getRight().setBlack(true);
leftRotate(x.getParent()); x = root;
}
} else {
Node w = x.getParent().getLeft();
if (!w.isBlack()) {
w.setBlack(true);
x.getParent().setBlack(false);
rightRotate(x.getParent());
w = x.getParent().getLeft();
}
if (w.getRight().isBlack() && w.getLeft().isBlack()) {
w.setBlack(false);
x = x.getParent();
} else {
if (w.getLeft().isBlack()) {
w.getRight().setBlack(true);
w.setBlack(false);
leftRotate(w);
w = x.getParent().getLeft();
}
w.setBlack(x.getParent().isBlack());
x.getParent().setBlack(true);
w.getLeft().setBlack(true);
rightRotate(x.getParent());
x = root;
}
}
}
x.setBlack(true);
}
// 其他辅助方法...
}
```
这只是一个简单的实现示例,更详细和完善的红黑树删除算法可以参考相关的算法书籍或网络资源。