Submission #930587

#	Time	Username	Problem	Language	Result	Execution time	Memory
930587		UmairAhmadMirza	Joker (BOI20_joker)	C++17	25 / 100	429 ms	22976 KiB

Joker

#include <bits/stdc++.h>
using namespace std;
int const N=2e5+5;
vector<int> adj[N];
bool dep[N];
int rep[N];
vector<int> com[N];
// int dp[N][N];
bool merge(int a,int b){
  int ra=a;
  int rb=b;
  a=rep[a];
  b=rep[b];
  // cout<<ra<<' '<<rb<<endl;
  if(a==b){
    if(dep[ra]==dep[rb])
      return 0;
    return 1;
  }
  if(com[a].size()>com[b].size()){
    swap(a,b);
    swap(ra,rb);
  }
  bool sw=0;
  if(dep[ra]==dep[rb])
    sw=1;
  for(auto i:com[a]){
    com[b].push_back(i);
    rep[i]=b;
    dep[i]^=sw;
  }
  com[a].clear();
  return 1;
}
int main() 
{
    int n,m,q;
    cin>>n>>m>>q;
    for(int i=1;i<=n;i++){
      com[i].push_back(i);
      rep[i]=i;
    }
    vector<pair<int,int>> edge;
    for(int i=0;i<m;i++){
      int a,b;
      cin>>a>>b;
      if(a>b)
        swap(a,b);
      edge.push_back({a,b});
    }
    int k=m;
    reverse(edge.begin(),edge.end());
    for(auto e:edge){
      k--;
      // cout<<"Include := "<<node<<endl;
      if(merge(e.first,e.second)==0)
        break;
    }
    // cout<<k<<endl;
    // cout<<k<<endl;
    for(int i=0;i<q;i++){
      int l,r;
      cin>>l>>r;
      if(r<=k)
        cout<<"YES"<<endl;
      else
        cout<<"NO"<<endl;
    }
    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 8
• Subtask 3: 25 / 25
• Subtask 4: 0 / 10
• Subtask 5: 0 / 22
• Subtask 6: 0 / 29