Submission #1041370

#TimeUsernameProblemLanguageResultExecution timeMemory
1041370HD1Connecting Supertrees (IOI20_supertrees)C++14
0 / 100
4 ms25180 KiB
#include "supertrees.h" #include<bits/stdc++.h> #define all(x) x.begin(),x.end() #define sz(x) ll(x.size()) #define pb push_back using namespace std; typedef long long ll; typedef pair<ll,ll> ii; const ll MAX=1e6; int f[MAX]; vector<int> adj[MAX]; set<ll> s, c; int fiend(int u){ if(f[u] == u)return u; return f[u]=fiend(f[u]); } void unir(int u,int v){ int x=fiend(u); int y=fiend(v); if(x!=y){ f[x]=y;//x en y } return; } int construct(vector<vector<int>> p) { int n = p.size(); for(int i=0; i<n; i++){ f[i]=i; } for(int i=0; i<n; i++){ for(int j=0; j<n; j++){ if(j==i){ if(p[i][j]!=0)return 0; } if(p[i][j]==1){ unir(i,j); } if(p[i][j]!=p[j][i])return 0; } } vector<vector<int>> gfo(n,vector<int>(n)); for(int i=0; i<n; i++){ fiend(f[i]); fiend(i); if(f[i]!=i)adj[f[i]].pb(i);// aqui estan cada subarbol de 1 o mas s.insert(f[i]);//representante de cada grupo } for(auto u:s){//armamos subarboles for(auto v:adj[u]){ gfo[v][u]=1; gfo[u][v]=1; } } for(int i=0; i<n; i++){ for(int j=0; j<n; j++){ if((!p[i][j] && i!=j) || p[i][j]==2){ if(f[i]==f[j]) return 0; } if(p[i][j]==1){ if(f[i]!=f[j]) return 0; } } } // para los ciclos for(int i=0; i<n; i++){ adj[i].clear(); for(int j=0; j<n; j++){ if(p[i][j]==2){ unir(f[i],f[j]); } } } for(auto u:s){ fiend(f[u]); fiend(u); if(f[u]!=u)adj[f[u]].pb(u); c.insert(f[u]); } for(int i=0; i<n; i++){ for(int j=0; j<n; j++){ if(!p[i][j] && i!=j){ if(f[i]==f[j]) return 0; } } } //cout<<sz(c)<<'\n'; for(auto x:c){// armamos ciclos //cout<<x<<' '; adj[x].pb(x); for(int i=0; i<sz(adj[x]); i++){ int v=adj[x][i%sz(adj[x])]; int u=adj[x][(i+1)%sz(adj[x])]; if(v!=u){ gfo[v][u]=1; gfo[u][v]=1; } } } build(gfo); return 1; } /* con fe 9 0 1 1 1 2 2 2 2 2 1 0 1 1 2 2 2 2 2 1 1 0 1 2 2 2 2 2 1 1 1 0 2 2 2 2 2 2 2 2 2 0 2 2 2 2 2 2 2 2 2 0 2 1 2 2 2 2 2 2 2 0 2 1 2 2 2 2 2 1 2 0 2 2 2 2 2 2 2 1 2 0 */
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