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#include "Graph/centroid.hpp"
#pragma once class CentroidDecomposition{ void get(int v,int p){ sz[v]=1; for(auto& to:g[v])if(to!=p and !used[to]){ get(to,v); sz[v]+=sz[to]; } } int dfs(int v,int p,int rt){ for(auto& to:g[v])if(to!=p and !used[to]){ if(sz[to]>(sz[rt]>>1))return dfs(to,v,rt); } return v; } public: int n; vector<vector<int>> g; vector<int> sz,used; CentroidDecomposition(int n_):n(n_),g(n),sz(n),used(n){} void add_edge(int u,int v){ g[u].push_back(v); g[v].push_back(u); } int find(int rt){ get(rt,-1); int res=dfs(rt,-1,rt); used[res]=1; return res; } }; /** * @brief Centroid Decomposition */
#line 2 "Graph/centroid.hpp" class CentroidDecomposition{ void get(int v,int p){ sz[v]=1; for(auto& to:g[v])if(to!=p and !used[to]){ get(to,v); sz[v]+=sz[to]; } } int dfs(int v,int p,int rt){ for(auto& to:g[v])if(to!=p and !used[to]){ if(sz[to]>(sz[rt]>>1))return dfs(to,v,rt); } return v; } public: int n; vector<vector<int>> g; vector<int> sz,used; CentroidDecomposition(int n_):n(n_),g(n),sz(n),used(n){} void add_edge(int u,int v){ g[u].push_back(v); g[v].push_back(u); } int find(int rt){ get(rt,-1); int res=dfs(rt,-1,rt); used[res]=1; return res; } }; /** * @brief Centroid Decomposition */