Coding (Algo)

Record History Queries

Algorithm: Binary search Difficulty: Medium Time: 45 minutes

Goal

Build an in-memory revision index and answer each record lookup at its own cutoff time.

What this task practices

Record History Queries 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.