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How to Solve Maximum Points After Collecting Coins From All Nodes Problem
Master the Maximum Points After Collecting Coins From All Nodes LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#2920
LeetCode ProblemMaximum Points After Collecting Coins From All Nodes
There exists an undirected tree rooted at node 0 with n nodes labeled from 0 to n - 1. You are given a 2D integer array edges of length n - 1, where edges[i] = [ai, bi] indicates that there is an edge between nodes ai and bi in the tree. You are also given a 0-indexed array coins of size n where coins[i] indicates the number of coins in the vertex i, and an integer k. Starting from the root, you have to collect all the coins such that the coins at a node can only be collected if the coins of its ancestors have been already collected. Coins at nodei can be collected in one of the following ways: Return the maximum points you can get after collecting the coins from all the tree nodes.
ArrayDynamic ProgrammingBit ManipulationTreeDepth-First SearchMemoization
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Problem Breakdown
Understanding the Maximum Points After Collecting Coins From All Nodes Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There exists an undirected tree rooted at node 0 with n nodes labeled from 0 to n - 1. You are given a 2D integer array edges of length n - 1, where edges[i] = [ai, bi] indicates that there is an edge between nodes ai and bi in the tree. You are also given a 0-indexed array coins of size n where coins[i] indicates the number of coins in the vertex i, and an integer k. Starting from the root, you have to collect all the coins such that the coins at a node can only be collected if the coins of its ancestors have been already collected. Coins at nodei can be collected in one of the following ways: Return the maximum points you can get after collecting the coins from all the tree nodes.
HardProblem #2920
LeetCodeMaximum Points After Collecting Coins From All Nodes
Related Topics
ArrayDynamic ProgrammingBit ManipulationTreeDepth-First SearchMemoization
How Phantom Code Helps
Get real-time assistance for Maximum Points After Collecting Coins From All Nodes problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
edges = [[0,1],[1,2],[2,3]], coins = [10,10,3,3], k = 5
Output
11
# Example 2
Input
edges = [[0,1],[0,2]], coins = [8,4,4], k = 0
Output
16
Constraints
n == coins.length
2 <= n <= 105
0 <= coins[i] <= 104
edges.length == n - 1
0 <= edges[i][0], edges[i][1] < n
0 <= k <= 104
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Solve Maximum Points After Collecting Coins From All Nodes — There exists an undirected tree rooted at node 0 with n nodes labeled from 0 to ...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Maximum Points After Collecting Coins From All Nodes and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Maximum Points After Collecting Coins From All Nodes during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Maximum Points After Collecting Coins From All Nodes?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Maximum Points After Collecting Coins From All Nodes?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Maximum Points After Collecting Coins From All Nodes type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Maximum Points After Collecting Coins From All Nodes interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Maximum Points After Collecting Coins From All Nodes during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Maximum Points After Collecting Coins From All Nodes style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Maximum Points After Collecting Coins From All Nodes interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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