Leetcode 1778. Shortest Path in a Hidden Grid
You must find the minimum number of moves from a starting cell to a target in a 2D grid that is initially unknown and can only be discovered by moving/probing neighboring cells; the challenge is to explore and map the hidden, obstacle-filled grid (usually via DFS/BFS) and then compute the shortest path on the discovered graph.
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Airbnb
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Mid November, 2024
Airbnb
Senior
Asked in Phone Screen Given an n x n binary matrix grid, return the length of the shortest clear path in the matrix. If there is no clear path, return -1. A clear path in a binary matrix is a path from the top-left cell (i.e., (0, 0)) to the bottom-right cell (i.e., (n - 1, n - 1)) such that: All the visited cells of the path are 0. All the adjacent cells of the path are 8-directionally connected (i.e., they are different and they share an edge or a corner). The length of a clear path is the number of visited cells of this path. https://leetcode.com/problems/shortest-path-in-binary-matrix/
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