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{"workbook":{"problemsBrief":"{\"HDU-4912\":[\"Paths on the tree\",586,\"\\u003cdiv class\\u003d\\\"panel_content\\\"\\u003e \\u003ca href\\u003d\\\"https://acm.hdu.edu.cn/search.php?field\\u003dproblem\\u0026amp;key\\u003d2014+Multi-University+Training+Contest+5\\u0026amp;source\\u003d1\\u0026amp;searchmode\\u003dsource\\\"\\u003e 2014 Multi-University Training Contest 5 \\u003c/a\\u003e \\u003c/div\\u003e\"],\"POJ-3107\":[\"Godfather\",3634,\"\\u003cdiv class\\u003d\\\"ptx\\\" lang\\u003d\\\"en-US\\\"\\u003e\\u003ca href\\u003d\\\"http://poj.org/searchproblem?field\\u003dsource\\u0026amp;key\\u003dNortheastern+Europe+2005\\\"\\u003eNortheastern Europe 2005\\u003c/a\\u003e, Northern Subregion\\u003c/div\\u003e\"],\"HDU-2586\":[\"How far away ?\",9076,\"\\u003cdiv class\\u003d\\\"panel_content\\\"\\u003e \\u003ca href\\u003d\\\"https://acm.hdu.edu.cn/search.php?field\\u003dproblem\\u0026amp;key\\u003dECJTU+2009+Spring+Contest+\\u0026amp;source\\u003d1\\u0026amp;searchmode\\u003dsource\\\"\\u003e ECJTU 2009 Spring Contest \\u003c/a\\u003e \\u003c/div\\u003e\"]}","joined":false,"groups":{}},"managingGroups":{},"author":"liumin_2022","updateTime":1697075889000,"title":"树的直径、重心、LCA","dislikeCnt":0,"content":"[problem:POJ-3107]\n[problem:HDU-2586]\n[problem:HDU-4912]","threadId":172657,"likeCnt":0,"createTime":1697075851000,"isWorkbook":true,"viewCnt":185,"openness":2,"fav":false,"id":4181,"trustable":false}