Coding (Algo)

Navigation Breadcrumbs

Algorithm: Ancestor traversal Difficulty: Medium Time: 30 minutes

Goal

Return root-to-page IDs or null when the target is missing, a parent is missing or a cycle is encountered.

What this task practices

Navigation Breadcrumbs is a coding (algo) interview exercise that trains prompt interpretation, explicit assumptions, a concrete response, and a clear explanation of tradeoffs. The catalog marks it as medium difficulty. It focuses on Technical Reasoning, Testing, Validation. The signed-in workspace provides the tools for the round and evaluates the attempt against task-specific criteria. Reference solutions, hidden checks, evaluator instructions, and candidate work remain private.