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Grokking the Coding Interview Patterns in C++

Solution: Longest Path With Different Adjacent Characters

Understand how to apply topological sorting to a tree to find the longest path with distinct adjacent characters. Explore tracking longest chains from child nodes and combining them at parent nodes to calculate the overall longest valid path.

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Statement

You are given a rooted tree with nn nodes, numbered from 00 to n−1n - 1, where the tree is connected, undirected, and has no cycles. The tree is represented by a 0-indexed array parent of size nn, where parent[i] is the parent of node ...