How to Solve Minimum Time to Collect All Apples in a Tree Problem
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Minimum Time to Collect All Apples in a Tree
Given an undirected tree consisting of n vertices numbered from 0 to n-1, which has some apples in their vertices. You spend 1 second to walk over one edge of the tree. Return the minimum time in seco...
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Understanding the Minimum Time to Collect All Apples in a Tree Problem
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Problem Statement
Given an undirected tree consisting of n vertices numbered from 0 to n-1, which has some apples in their vertices. You spend 1 second to walk over one edge of the tree. Return the minimum time in seconds you have to spend to collect all apples in the tree, starting at vertex 0 and coming back to this vertex. The edges of the undirected tree are given in the array edges, where edges[i] = [ai, bi] means that exists an edge connecting the vertices ai and bi. Additionally, there is a boolean array hasApple, where hasApple[i] = true means that vertex i has an apple; otherwise, it does not have any apple.
Minimum Time to Collect All Apples in a Tree
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Examples
n = 7, edges = [[0,1],[0,2],[1,4],[1,5],[2,3],[2,6]], hasApple = [false,false,true,false,true,true,false]8The figure above represents the given tree where red vertices have an apple. One optimal path to collect all apples is shown by the green arrows.
n = 7, edges = [[0,1],[0,2],[1,4],[1,5],[2,3],[2,6]], hasApple = [false,false,true,false,false,true,false]6The figure above represents the given tree where red vertices have an apple. One optimal path to collect all apples is shown by the green arrows.
n = 7, edges = [[0,1],[0,2],[1,4],[1,5],[2,3],[2,6]], hasApple = [false,false,false,false,false,false,false]0Constraints
1 <= n <= 105edges.length == n - 1edges[i].length == 20 <= ai < bi <= n - 1hasApple.length == nHow Interview Coder Helps with Leetcode Problems
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