AceStack AI

Coding (Algo)

Count Clear Routes

Algorithm: Dynamic programming Difficulty: Medium Time: 35 minutes

Goal

Return the number of clear right-and-down routes from the top-left cell to the bottom-right cell.

What this task practices

Count Clear Routes 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.

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