Grokking 75: Top Coding Interview Questions
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Solution: Walls and Gates
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Problem Statement

You are given a grid of size m x n filled with three possible values:

  • -1 representing a wall or an obstacle.
  • 0 representing a gate.
  • 2147483647 (INF) representing an empty room.

Fill each empty room with the distance to its nearest gate. If an empty room cannot reach any gate, it should remain 2147483647.

Examples

Example 1

  • Input: 
    [[2147483647, -1, 0],
 [2147483647, 2147483647, 2147483647],
 [2147483647, -1, 2147483647]]
  • Expected Output: 
    [[4, -1, 0],
 [3, 2, 1],
 [4, -1, 2]]

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