Submission #301134

#TimeUsernameProblemLanguageResultExecution timeMemory
301134ElyesChaabouniConnecting Supertrees (IOI20_supertrees)C++14
19 / 100
286 ms22236 KiB
#include "supertrees.h" #include <bits/stdc++.h> using namespace std; int anc[200000], anc1[200000]; void get_anc(int x) { if(x==-1) return; int cu=anc[x]; while(cu!=anc[cu]) cu=anc[cu]; anc[x]=cu; } void unite(int x, int y) { get_anc(x); get_anc(y); if(anc[x]==anc[y]) return; anc[anc[y]]=anc[x]; anc[y]=anc[x]; } void get_anc1(int x) { int cu=anc1[x]; while(cu!=anc1[cu]) cu=anc1[cu]; anc1[x]=cu; } void unite1(int x, int y) { get_anc1(x); get_anc1(y); anc1[anc1[y]]=anc1[x]; anc1[y]=anc1[x]; } /*void build(vector<vector<int> >x) { for(int i = 0; i < 2; i++) { for(int j = 0; j < 2; j++) cout << x[j][i] << ' '; cout << '\n'; } }*/ int construct(std::vector<std::vector<int>> p) { int n = p.size(); std::vector<std::vector<int>> ans; for (int i = 0; i < n; i++) { std::vector<int> row; row.resize(n); ans.push_back(row); } for(int i = 0; i < n; i++) for(int j = 0; j < n; j++) ans[i][j]=0; for(int i = 0; i < n; i++) anc[i]=i; for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { if(p[i][j]==1) unite(i, j); } } for(int i = 0; i < n; i++) { get_anc(i); //cout << anc[i] << ' '; } for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { if(((anc[i]==anc[j]) && (p[i][j]!=1)) || ((anc[i]!=anc[j]) && (p[i][j]==1))) return 0; if(p[i][j]==3) return 0; } } for(int i = 0; i < n; i++) { vector<int>v; for(int j = 0; j < n; j++) { if(anc[j]==i) v.push_back(j); } for(int j = 0; j < ((int)(v.size()))-1; j++) { ans[v[j]][v[j+1]]=1; ans[v[j+1]][v[j]]=1; } } for(int i = 0; i < n; i++) anc1[i]=-1; for(int i = 0; i < n; i++) { bool found=0; for(int j = 0; j < n && !found; j++) { if(anc[j]==i) found=1; } if(found) anc1[i]=i; } for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { if(p[i][j]==2) { get_anc(i); get_anc(j); unite1(anc[i], anc[j]); } } } for(int i = 0; i < n;i++) get_anc1(i); for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { if(p[i][j]==0 && anc1[anc[i]] == anc1[anc[j]] && anc1[anc[i]]!=-1) return 0; } } for(int i = 0; i < n; i++) { vector<int>v; for(int j = 0; j < n; j++) { if(anc1[j]==i) v.push_back(j); } for(int j = 0; j < ((int)(v.size()))-1; j++) { ans[v[j]][v[j+1]]=1; ans[v[j+1]][v[j]]=1; } if(v.size() == 2) return 0; if(v.size() > 2) { ans[v[0]][v.back()]=1; ans[v.back()][v[0]]=1; } } for(int i = 0; i < n; i++) ans[i][i]=0; build(ans); return 1; } /*int main() { freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout); vector<vector<int> >a; int n; cin >> n; for(int i = 0; i < 2; i++) { vector<int>x; x.resize(2); a.push_back(x); } for(int i = 0; i < 2; i++) for(int j = 0; j < 2; j++) cin >> a[i][j]; cout << construct(a) << '\n'; }*/
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