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2017 Multi-University Training Contest - Team 4 phone call(樹+lca+並查集)
時間 2020-12-26
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題解: (並查集處理往上跳的時候,一定要先讓u,v往上跳到並查集的祖先,不然會wa掉) 代碼如下: #include <iostream> #include <algorithm> #include <cstdio> #include <vector> #include <cstring> using namespace std; const int maxn = 1e5 + 100; typ
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