Official algorithmic problem description and constraints.
There exists an undirected tree with n nodes numbered 0 to n - 1. You are given a 2D integer array edges of length n - 1, where edges[i] = [ui, vi] indicates that there is an edge between nodes ui and vi in the tree.
Initially, all nodes are unmarked. For each node i:
i is odd, the node will get marked at time x if there is at least one node adjacent to it which was marked at time x - 1.i is even, the node will get marked at time x if there is at least one node adjacent to it which was marked at time x - 2.Return an array times where times[i] is the time when all nodes get marked in the tree, if you mark node i at time t = 0.
Note that the answer for each times[i] is independent, i.e. when you mark node i all other nodes are unmarked.
Example 1:
Input: edges = [[0,1],[0,2]]
Output: [2,4,3]
Explanation:
i = 0:t = 1, and Node 2 at t = 2.i = 1:t = 2, and Node 2 at t = 4.i = 2:t = 2, and Node 1 at t = 3.Example 2:
Input: edges = [[0,1]]
Output: [1,2]
Explanation:
i = 0:t = 1.i = 1:t = 2.Example 3:
Input: edges = [[2,4],[0,1],[2,3],[0,2]]
Output: [4,6,3,5,5]
Explanation:
Constraints:
2 <= n <= 105edges.length == n - 1edges[i].length == 20 <= edges[i][0], edges[i][1] <= n - 1edges represents a valid tree.Detailed video explanations, mathematical intuition, and clean C++ implementation code.