diff --git a/src/main/java/com/code/leet/entiy/Node.java b/src/main/java/com/code/leet/entiy/Node.java index 87c8ddb..fa9820f 100644 --- a/src/main/java/com/code/leet/entiy/Node.java +++ b/src/main/java/com/code/leet/entiy/Node.java @@ -9,6 +9,8 @@ public class Node { public Node random; public Node prev; public Node child; + public Node left; + public Node right; public List children; public Node(int val) { diff --git a/src/main/java/leetcode/editor/cn/PopulatingNextRightPointersInEachNodeIi.java b/src/main/java/leetcode/editor/cn/PopulatingNextRightPointersInEachNodeIi.java new file mode 100644 index 0000000..da737bf --- /dev/null +++ b/src/main/java/leetcode/editor/cn/PopulatingNextRightPointersInEachNodeIi.java @@ -0,0 +1,116 @@ +//给定一个二叉树 +// +// +//struct Node { +// int val; +// Node *left; +// Node *right; +// Node *next; +//} +// +// 填充它的每个 next 指针,让这个指针指向其下一个右侧节点。如果找不到下一个右侧节点,则将 next 指针设置为 NULL。 +// +// 初始状态下,所有 next 指针都被设置为 NULL。 +// +// +// +// 进阶: +// +// +// 你只能使用常量级额外空间。 +// 使用递归解题也符合要求,本题中递归程序占用的栈空间不算做额外的空间复杂度。 +// +// +// +// +// 示例: +// +// +// +// +//输入:root = [1,2,3,4,5,null,7] +//输出:[1,#,2,3,#,4,5,7,#] +//解释:给定二叉树如图 A 所示,你的函数应该填充它的每个 next 指针,以指向其下一个右侧节点,如图 B 所示。序列化输出按层序遍历顺序(由 next 指 +//针连接),'#' 表示每层的末尾。 +// +// +// +// 提示: +// +// +// 树中的节点数小于 6000 +// -100 <= node.val <= 100 +// +// +// +// +// +// +// Related Topics 树 深度优先搜索 广度优先搜索 二叉树 +// 👍 436 👎 0 + +package leetcode.editor.cn; + +import com.code.leet.entiy.Node; + +import java.util.LinkedList; +import java.util.Queue; + +//117:填充每个节点的下一个右侧节点指针 II +class PopulatingNextRightPointersInEachNodeIi { + public static void main(String[] args) { + //测试代码 + Solution solution = new PopulatingNextRightPointersInEachNodeIi().new Solution(); + } + + //力扣代码 + //leetcode submit region begin(Prohibit modification and deletion) +/* +// Definition for a Node. +class Node { + public int val; + public Node left; + public Node right; + public Node next; + + public Node() {} + + public Node(int _val) { + val = _val; + } + + public Node(int _val, Node _left, Node _right, Node _next) { + val = _val; + left = _left; + right = _right; + next = _next; + } +}; +*/ + + class Solution { + public Node connect(Node root) { + if (root == null) { + return null; + } + Queue queue = new LinkedList<>(); + queue.add(root); + while (!queue.isEmpty()) { + int size = queue.size(); + for (int i = 0; i < size; i++) { + Node node = queue.poll(); + node.next = i == size - 1 ? null : queue.peek(); + if (node.left != null) { + queue.add(node.left); + } + if (node.right != null) { + queue.add(node.right); + } + } + } + return root; + } + } +//leetcode submit region end(Prohibit modification and deletion) + +} \ No newline at end of file diff --git a/src/main/java/leetcode/editor/cn/PopulatingNextRightPointersInEachNodeIi.md b/src/main/java/leetcode/editor/cn/PopulatingNextRightPointersInEachNodeIi.md new file mode 100644 index 0000000..1293ba0 --- /dev/null +++ b/src/main/java/leetcode/editor/cn/PopulatingNextRightPointersInEachNodeIi.md @@ -0,0 +1,48 @@ +

给定一个二叉树

+ +
+struct Node {
+  int val;
+  Node *left;
+  Node *right;
+  Node *next;
+}
+ +

填充它的每个 next 指针,让这个指针指向其下一个右侧节点。如果找不到下一个右侧节点,则将 next 指针设置为 NULL

+ +

初始状态下,所有 next 指针都被设置为 NULL

+ +

 

+ +

进阶:

+ + + +

 

+ +

示例:

+ +

+ +
+输入:root = [1,2,3,4,5,null,7]
+输出:[1,#,2,3,#,4,5,7,#]
+解释:给定二叉树如图 A 所示,你的函数应该填充它的每个 next 指针,以指向其下一个右侧节点,如图 B 所示。序列化输出按层序遍历顺序(由 next 指针连接),'#' 表示每层的末尾。
+ +

 

+ +

提示:

+ + + +

 

+ + +
Related Topics
  • 深度优先搜索
  • 广度优先搜索
  • 二叉树
  • \n
  • 👍 436
  • 👎 0
  • \ No newline at end of file