Submission #750868

#	Time	Username	Problem	Language	Result	Execution time	Memory
750868		edogawa_something	Povjerenstvo (COI22_povjerenstvo)	C++17	0 / 100	253 ms	41288 KiB

Main

#include<bits/stdc++.h>
#include<chrono>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef string str;
typedef bool bl;
typedef vector<ll> vii;
typedef pair<ll,ll> pii;
typedef vector<pii> vpi;
#define ordered_set tree<pii,null_type,less<pii>,rb_tree_tag,tree_order_statistics_node_update>
#define fast ios_base::sync_with_stdio(0);cin.tie();
#define test ll qqqqq;cin>>qqqqq;while(qqqqq--)
#define test1 ll qqqqq=1;while(qqqqq--)
#define F first
#define S second
#define forn(i,n) for(int i=0;i<n;i++)
#define forx(i,j,n) for(int i=j;i<n;i++)
#define pb push_back
#define eb emplace_back
#define pob pop_back
#define all(v) v.begin(),v.end()
#define lb lower_bound
#define ub upper_bound
#define pow powww
#define prtll(x) printf("%lld",x)
#define prtld(x) printf("%Lf",x)
#define prtst(x) printf("%s",x)
#define prtch(x) printf("%c",x)
#define measure chrono::high_resolution_clock::now()
#define duration chrono::duration_cast<chrono::milliseconds>(end-start)
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
const ll dx[]{1,0,-1,0,1,-1,1,-1};
const ll dy[]{0,-1,0,1,1,-1,-1,1};
const ll inf=1e18;
const ll mod=1e9+7;
const ll LM=1e8+1;
const ll M=5e5+10;
const ll MM=4002;
const ll MMM=501;
const ld pi=acos(-1);
//const ll mod=998244353;
ll pow(ll r,ll to,ll m=mod){
  ll res=1;
  r%=m;
  while(to){
    if((to&1)){
      res*=r,res%=m;
    }
    r*=r,r%=m;
    to=(to>>1);
  }
  return res;
}
ll n,m,mp[M];
vii v[M];
bl vis[M];
ll col[M];
ll inv(ll x){
  if(x==1)
  return 2;
  else
  return 1;
}
int main(){
  fast
  //freopen("gen.txt","r",stdin);
  auto start=measure;
  test1{
    cin>>n>>m;
    forn(i,m){
      ll x,y;
      cin>>x>>y;
      v[y].pb(x);
      mp[x]=1;
    }
    queue<ll>q;
    forx(i,1,n+1){
      if(!mp[i])
      q.push(i),col[i]=1;
    }
    while(!q.empty()){
      ll r=q.front();
      q.pop();
      for(auto it:v[r]){
        if(vis[it]){
        if(col[it]==col[r]){
        cout<<-1<<'\n';
        return 0;
        }
        continue;
        }
        vis[it]=1;
        col[it]=inv(col[r]);
        q.push(it);
      }
    }
    vii ans;
    forx(i,1,n+1){
      if(col[i]==1)
      ans.pb(i);
    }
    cout<<ans.size()<<'\n';
    for(auto it:ans)
    cout<<it<<' ';
  }
  auto end=measure;
  auto dur=duration;
  //cout<<fixed<<dur.count()<<'\n';
  return 0;
}
/*
*/

• Subtask 1: 0 / 13
• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 33