Coding·60 minMembers

Number of Islands and Grid BFS Variants

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Grid traversal in the 'number of islands' family — count connected components, then a follow-up that adds a constraint such as no-modify-in-place, equal-shape detection, water-flow direction, or 2D sc...

SWE

Infra Eng

grid

bfs

dfs

union-find

medium

Frequency

High

Last asked

2026-08-08

Stage

phone-screen · onsite-coding

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