C - Alternating Path image

  • Thoughts.
    • When adjacent squares are of different colors, they are good walls to pass through.
    • This relationship is symmetric
    • That is, the connected component of an undirected graph
    • UnionFind then triangle number - A kind of Frequency→Triangular number.
  • Official Explanation
    • Missed the “black and white pair.”
      • I thought it was two arbitrary points.
      • Black x white” instead of triangular numbers

aising2019


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