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Grokking the Coding Interview Patterns in C#

Solution: Longest Path With Different Adjacent Characters

Discover how to identify the longest path in a tree where no two adjacent nodes share the same character. This lesson walks you through calculating child counts, processing nodes in reverse topological order, and combining longest chains to solve the problem efficiently.

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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 ii. The root node is node 00, so parent[0] =−1= -1.

Additionally, you are provided a string s of length nn, where s[i] represents the character assigned to node ...