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"## basics"
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"source": [
"- 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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