제출 #1065738

#제출 시각아이디문제언어결과실행 시간메모리
1065738epicci23열쇠 (IOI21_keys)C++17
0 / 100
3100 ms33116 KiB
#include "bits/stdc++.h" #define all(v) v.begin() , v.end() #define sz(a) (int)a.size() using namespace std; const int N = 3e5 + 5; map<int,vector<int>> v[N]; set<int> s[N]; vector<int> cur,vis(N,0),mark(N,0); struct DSU{ vector<int> par,siz; DSU(int n){ par.resize(n); siz.assign(n,1); iota(all(par),0); } int find(int a){ if(par[a]==a) return a; return par[a]=find(par[a]); } void unite(int a,int b){ a=find(a),b=find(b); if(a==b) return; if(siz[a]<siz[b]) swap(a,b); par[b]=a; siz[a]+=siz[b]; } }; DSU dsu(N); void merge_info(int a,int b){ a=dsu.find(a),b=dsu.find(b); if(a==b) return; dsu.unite(a,b); mark[a]|=mark[b]; if(sz(s[a])<sz(s[b])) swap(s[a],s[b]); for(int u:s[b]) s[a].insert(u); int sA=0,sB=0; for(auto x:v[a]) sA+=sz(x.second); for(auto x:v[b]) sB+=sz(x.second); if(sA<sB) swap(v[a],v[b]); for(auto x:v[b]) v[a][x.first].insert(v[a][x.first].end(),all(x.second)); if(dsu.find(a)==b){ swap(s[a],s[b]); swap(mark[a],mark[b]); swap(v[a],v[b]); s[a].clear(); v[a].clear(); } } void dfs(int c){ cur.push_back(c); vis[c]=1; for(int u:s[dsu.find(c)]){ while(!v[dsu.find(c)][u].empty()){ int x=v[dsu.find(c)][u].back(); v[dsu.find(c)][u].pop_back(); if(x==dsu.find(c)) continue; if(vis[x]==2){ mark[dsu.find(c)]=1; continue; } if(vis[x]==1){ while(!cur.empty() && dsu.find(cur.back())!=dsu.find(x)){ merge_info(cur.back(),x); cur.pop_back(); } } else{ dfs(x); if(dsu.find(c)!=dsu.find(x)) mark[dsu.find(c)]=1; } } } if(!cur.empty() && cur.back()==c) cur.pop_back(); vis[c]=2; } vector<int> find_reachable(vector<int> R, vector<int> U, vector<int> V, vector<int> C){ int n=sz(R),m=sz(U); for(int i=0;i<n;i++) s[i].insert(R[i]); for(int i=0;i<m;i++){ int a=U[i],b=V[i],c=C[i]; v[a][c].push_back(b); v[b][c].push_back(a); } for(int i=0;i<n;i++) if(vis[i]==0) dfs(i); int mini=100000007; for(int i=0;i<n;i++){ if(mark[dsu.find(i)]) continue; mini=min(mini,dsu.siz[dsu.find(i)]); } vector<int> ans(n,0); for(int i=0;i<n;i++) if(!mark[dsu.find(i)] && dsu.siz[dsu.find(i)]==mini) ans[i]=1; return ans; } /*void _(){ int n,m; cin >> n >> m; vector<int> col(n); for(int i=0;i<n;i++) cin >> col[i]; for(int i=0;i<n;i++) s[i].insert(col[i]); for(int i=0;i<m;i++){ int a,b,c; cin >> a >> b >> c; v[a][c].push_back(b); v[b][c].push_back(a); } for(int i=0;i<n;i++) if(vis[i]==0) dfs(i); int mini=100000007; for(int i=0;i<n;i++){ if(mark[dsu.find(i)]) continue; mini=min(mini,dsu.siz[dsu.find(i)]); } vector<int> ans(n,0); for(int i=0;i<n;i++) if(!mark[dsu.find(i)] && dsu.siz[dsu.find(i)]==mini) ans[i]=1; for(int i=0;i<n;i++) cout << ans[i] << " \n"[i==n-1]; } int32_t main(){ cin.tie(0); ios::sync_with_stdio(0); int tc=1;//cin >> tc; while(tc--) _(); return 0; }*/
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