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87 lines
2.5 KiB
87 lines
2.5 KiB
package class11;
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public class Code06_SuccessorNode {
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public static class Node {
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public int value;
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public Node left;
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public Node right;
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public Node parent;
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public Node(int data) {
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this.value = data;
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}
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}
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public static Node getSuccessorNode(Node node) {
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if (node == null) {
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return node;
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}
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if (node.right != null) {
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return getLeftMost(node.right);
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} else { // 无右子树
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Node parent = node.parent;
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while (parent != null && parent.right == node) { // 当前节点是其父亲节点右孩子
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node = parent;
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parent = node.parent;
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}
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return parent;
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}
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}
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public static Node getLeftMost(Node node) {
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if (node == null) {
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return node;
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}
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while (node.left != null) {
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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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public static void main(String[] args) {
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Node head = new Node(6);
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head.parent = null;
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head.left = new Node(3);
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head.left.parent = head;
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head.left.left = new Node(1);
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head.left.left.parent = head.left;
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head.left.left.right = new Node(2);
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head.left.left.right.parent = head.left.left;
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head.left.right = new Node(4);
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head.left.right.parent = head.left;
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head.left.right.right = new Node(5);
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head.left.right.right.parent = head.left.right;
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head.right = new Node(9);
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head.right.parent = head;
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head.right.left = new Node(8);
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head.right.left.parent = head.right;
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head.right.left.left = new Node(7);
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head.right.left.left.parent = head.right.left;
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head.right.right = new Node(10);
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head.right.right.parent = head.right;
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Node test = head.left.left;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.left.left.right;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.left;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.left.right;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.left.right.right;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.right.left.left;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.right.left;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.right;
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System.out.println(test.value + " next: " + getSuccessorNode(test).value);
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test = head.right.right; // 10's next is null
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System.out.println(test.value + " next: " + getSuccessorNode(test));
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}
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}
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