People really need to stop blindly copying code from the Internet.

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The post explains common mistakes found in bidirectional BFS implementations and highlights how widely available online resources often have errors. The author describes the basics of graphs and pathfinding algorithms, and illustrates proper and improper uses of bidirectional BFS with interactive examples. Significant improvements are noted by using the correct algorithm, and the practical outcomes of verifying algorithm implementations are emphasized.

Everyone gets bidirectional BFS wrong