# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
994867 | Newtonabc | 슈퍼트리 잇기 (IOI20_supertrees) | C++14 | 197 ms | 24148 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "supertrees.h"
#include<bits/stdc++.h>
using namespace std;
const int N=1e3+10;
vector<int> v;
int pa[N];
bool cy[N][N];
vector<int> adj[N];
int cnt=0;
bool vs[N];
void dfs(int u){
vs[u]=true;
cnt++;
if(adj[u].size()==1) v.push_back(u);
for(int i=0;i<adj[u].size();i++){
if(!vs[adj[u][i]]) dfs(adj[u][i]);
}
}
int root(int x){
if(pa[x]==x) return x;
else return pa[x]=root(pa[x]);
}
int construct(vector<vector<int> > p) {
int n = p.size();
vector<vector<int> > answer;
for (int i = 0; i < n; i++) {
vector<int> row(n,0);
answer.push_back(row);
}
for(int i=0;i<n;i++) pa[i]=i;
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(p[i][j]==1 && root(i)!=root(j)){
answer[i][j]=1;
answer[j][i]=1;
pa[root(i)]=root(j);
}
if(p[i][j]==3) return 0;
}
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(p[i][j]==0){
if(root(i)==root(j)) return 0;
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
int a,b;
if(p[i][j]==2){
a=root(i),b=root(j);
if(a==b) continue;
pa[a]=b;
answer[a][b]=1;
answer[b][a]=1;
adj[a].push_back(b);
adj[b].push_back(a);
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(root(i)==root(j) && p[i][j]==0) return 0;
}
}
for(int i=0;i<n;i++){
cnt=0;
if(!vs[i]) dfs(i);
if(cnt==2) return 0;
if(v.empty()) continue;
answer[v[0]][v[1]]=1;
answer[v[1]][v[0]]=1;
v.clear();
}
build(answer);
return 1;
}
Compilation message (stderr)
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