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2017 Multi-University Training Contest - Team 4 phone call(树+lca+并查集)
时间 2020-12-26
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题解: (并查集处理往上跳的时候,一定要先让u,v往上跳到并查集的祖先,不然会wa掉) 代码如下: #include <iostream> #include <algorithm> #include <cstdio> #include <vector> #include <cstring> using namespace std; const int maxn = 1e5 + 100; typ
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