Grid/Graph BFS Problem from 1point3acres Link (expects possible O(1) query with preprocessing)

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Problem: From 1point3acres link (insufficient details)

Source link:

  • https://www.1point3acres.com/bbs/thread-1091211-1-1.html

From the interview notes:

  • A standard BFS solution was implemented....

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and practice with sample input/output

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Standard Input
Execution Result: