Skip to content

3425. Longest Special Path

Description

You are given an undirected tree rooted at node 0 with n nodes numbered from 0 to n - 1, represented by a 2D array edges of length n - 1, where edges[i] = [ui, vi, lengthi] indicates an edge between nodes ui and vi with length lengthi. You are also given an integer array nums, where nums[i] represents the value at node i.

A special path is defined as a downward path from an ancestor node to a descendant node such that all the values of the nodes in that path are unique.

Note that a path may start and end at the same node.

Return an array result of size 2, where result[0] is the length of the longest special path, and result[1] is the minimum number of nodes in all possible longest special paths.

 

Example 1:

Input: edges = [[0,1,2],[1,2,3],[1,3,5],[1,4,4],[2,5,6]], nums = [2,1,2,1,3,1]

Output: [6,2]

Explanation:

In the image below, nodes are colored by their corresponding values in nums

The longest special paths are 2 -> 5 and 0 -> 1 -> 4, both having a length of 6. The minimum number of nodes across all longest special paths is 2.

Example 2:

Input: edges = [[1,0,8]], nums = [2,2]

Output: [0,1]

Explanation:

The longest special paths are 0 and 1, both having a length of 0. The minimum number of nodes across all longest special paths is 1.

 

Constraints:

  • 2 <= n <= 5 * 104
  • edges.length == n - 1
  • edges[i].length == 3
  • 0 <= ui, vi < n
  • 1 <= lengthi <= 103
  • nums.length == n
  • 0 <= nums[i] <= 5 * 104
  • The input is generated such that edges represents a valid tree.

Solutions

Solution 1

1


1


1


1

Comments