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Last Updated: October 19, 2026
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In this video we are solving an interview question currently being asked at Apple and Amazon: Crack this Medium tree problem using a clean DFS traversal with a frequency map — the exact pattern that shows up in top-tier ... In this video, learn how to inject the usage of HashMap or Dictionary library (Data Structure) to solve a problem based on Trees, ... amzn.to/4aLHbLD You're literally one away from a better setup — grab it now! As an Amazon Associate I earn ... Channel Discord Community: discord.com/invite/s8JX2ARnSg Problem Link: ... 经过分析，根据题目的特点发现应该应用后续遍历的顺序计算所有子树之和，并且把子树之和以及它们出现的频率保存到哈希表中。 neetcode.io/ - A better way to prepare for Coding Interviews Discord: discord.gg/ddjKRXPqtk Twitter: ...
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