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Leetcode 305. Number of Islands II

Given an initially all-water m×n grid, process a sequence of add-land operations and return the number of islands (4-directionally connected land components) after each addition. The problem requires maintaining dynamic connectivity efficiently—typically via Union-Find (disjoint set) with handling for duplicate adds and frequent merges.

Asked at:

Uber

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Company

Level

Region

Early August, 2025

Uber

Mid-level

Early July, 2025

Uber

Senior

Early April, 2025

Uber

Senior

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