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    "## basics"
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    "- 图上的 bfs、dfs，核心是遇到岔路的处理办法：\n",
    "    - bfs，走走走走走，遇到一个分叉的地方（记为 a），沿着岔路口往前走，直到遇到新的岔路的地方（记为b），然后回溯返回到 a，沿着a，的下一个分叉走到新的分叉的位置；"
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