Leetcode
2020.05.01 20:27

687. Longest Univalue Path

조회 수 570 추천 수 0 댓글 0
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄

Given a binary tree, find the length of the longest path where each node in the path has the same value. This path may or may not pass through the root.

The length of path between two nodes is represented by the number of edges between them.

 

Example 1:

Input:

              5
             / \
            4   5
           / \   \
          1   1   5

Output: 2

 

Example 2:

Input:

              1
             / \
            4   5
           / \   \
          4   4   5

Output: 2

 

Note: The given binary tree has not more than 10000 nodes. The height of the tree is not more than 1000.


/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
class Solution {
    int length;
    
    public int longestUnivaluePath(TreeNode root) {
        if(root == null){
            return 0;
        }
        
        length = 0;
        findLength(root);
        
        return length;
    }
    
    public int findLength(TreeNode node){
        if(node == null){
            return 0;
        }
        
        int left = findLength(node.left);
        int right = findLength(node.right);
        
        int currLeft = 0;
        int currRight = 0;
        
        if(node.left != null && node.left.val == node.val){
            currLeft = left + 1;
        }
        
        if(node.right != null && node.right.val == node.val){
            currRight = right + 1;
        }
        
        if(length < currLeft + currRight){
            length = currLeft + currRight;
        }
        
        return Math.max(currLeft, currRight);
    }
}


[문제] https://leetcode.com/problems/longest-univalue-path/



?

List of Articles
번호 분류 제목 글쓴이 날짜 조회 수
77 Leetcode 720. Longest Word in Dictionary hooni 2020.05.07 668
76 Leetcode 225. Implement Stack using Queues hooni 2020.05.05 569
75 Leetcode 56. Merge Intervals hooni 2020.05.05 529
74 Leetcode 844. Backspace String Compare hooni 2020.05.05 538
73 Leetcode 222. Count Complete Tree Nodes hooni 2020.05.05 552
72 Leetcode 697. Degree of an Array hooni 2020.05.05 628
71 Leetcode 605. Can Place Flowers hooni 2020.05.05 541
70 Leetcode 724. Find Pivot Index hooni 2020.05.05 560
69 Leetcode 448. Find All Numbers Disappeared in an Array hooni 2020.05.05 510
68 Leetcode 628. Maximum Product of Three Numbers hooni 2020.05.05 517
67 Leetcode 532. K-diff Pairs in an Array hooni 2020.05.04 570
66 Leetcode 897. Increasing Order Search Tree hooni 2020.05.04 538
65 Leetcode 872. Leaf-Similar Trees file hooni 2020.05.04 527
64 Leetcode 876. Middle of the Linked List hooni 2020.05.04 515
63 Leetcode 203. Remove Linked List Elements hooni 2020.05.04 501
62 Leetcode 997. Find the Town Judge hooni 2020.05.02 562
61 Leetcode 270. Closest Binary Search Tree Value hooni 2020.05.01 493
» Leetcode 687. Longest Univalue Path hooni 2020.05.01 570
59 Leetcode 783. Minimum Distance Between BST Nodes hooni 2020.05.01 584
58 Leetcode 235. Lowest Common Ancestor of a Binary Search Tree file hooni 2020.05.01 570
Board Pagination Prev 1 2 3 4 Next
/ 4