93 lines
2.0 KiB
Java
93 lines
2.0 KiB
Java
//给定一个 N 叉树,找到其最大深度。
|
||
//
|
||
// 最大深度是指从根节点到最远叶子节点的最长路径上的节点总数。
|
||
//
|
||
// N 叉树输入按层序遍历序列化表示,每组子节点由空值分隔(请参见示例)。
|
||
//
|
||
//
|
||
//
|
||
// 示例 1:
|
||
//
|
||
//
|
||
//
|
||
//
|
||
//输入:root = [1,null,3,2,4,null,5,6]
|
||
//输出:3
|
||
//
|
||
//
|
||
// 示例 2:
|
||
//
|
||
//
|
||
//
|
||
//
|
||
//输入:root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,
|
||
//null,13,null,null,14]
|
||
//输出:5
|
||
//
|
||
//
|
||
//
|
||
//
|
||
// 提示:
|
||
//
|
||
//
|
||
// 树的深度不会超过 1000 。
|
||
// 树的节点数目位于 [0, 10⁴] 之间。
|
||
//
|
||
// Related Topics 树 深度优先搜索 广度优先搜索 👍 257 👎 0
|
||
|
||
package leetcode.editor.cn;
|
||
|
||
import com.code.leet.entiy.Node;
|
||
|
||
import java.util.Arrays;
|
||
|
||
//559:N 叉树的最大深度
|
||
public class MaximumDepthOfNAryTree {
|
||
public static void main(String[] args) {
|
||
Solution solution = new MaximumDepthOfNAryTree().new Solution();
|
||
Node root = new Node(Arrays.asList(1, null, 2, 3, 4, 5, null, null, 6, 7, null, 8, null, 9, 10, null, null, 11, null, 12, null, 13, null, null, 14));
|
||
solution.maxDepth(root);
|
||
}
|
||
|
||
//leetcode submit region begin(Prohibit modification and deletion)
|
||
/*
|
||
// Definition for a Node.
|
||
class Node {
|
||
public int val;
|
||
public List<Node> children;
|
||
|
||
public Node() {}
|
||
|
||
public Node(int _val) {
|
||
val = _val;
|
||
}
|
||
|
||
public Node(int _val, List<Node> _children) {
|
||
val = _val;
|
||
children = _children;
|
||
}
|
||
};
|
||
*/
|
||
|
||
class Solution {
|
||
public int maxDepth(Node root) {
|
||
if (root == null) {
|
||
return 0;
|
||
}
|
||
dfs(root, 0);
|
||
return max;
|
||
}
|
||
|
||
int max = 0;
|
||
|
||
private void dfs(Node root, int deep) {
|
||
deep++;
|
||
for (Node child : root.children) {
|
||
dfs(child, deep);
|
||
}
|
||
max = Math.max(max, deep);
|
||
}
|
||
}
|
||
//leetcode submit region end(Prohibit modification and deletion)
|
||
|
||
} |