# Factory grid and robots reachability interview question Aced (formerly Exponent) publishes a public search API over its indexed pages; the guide is at https://www.aced.io/agents/agent-access. Source: https://www.aced.io/questions/5638/factory-grid-robots Source observed: 2026-11-05T00:48:07.814Z Last checked: 2026-11-05T00:48:07.814+00:00 Indexed: 2026-11-07T03:02:36.419+00:00 --- # Factory grid and robots reachability interview question We provide this coding interview question through Aced (formerly Exponent), our interview-preparation platform. ## Problem Given a factory represented as a 2D grid with some cells blocked and some containing robots, determine whether the robots can collectively reach all unblocked cells. Robots can move in four directions—up, down, left, and right—and cannot pass through blocked cells. The question concerns reachability across the unblocked portion of the grid. 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