Submission #930610

#	Time	Username	Problem	Language	Result	Execution time	Memory
930610		UmairAhmadMirza	Joker (BOI20_joker)	C++14	6 / 100	2017 ms	20208 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];
int L[205];
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;
    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});
    }
    for(int i=0;i<min(205,m+1);i++){
      for(int t=0;t<=n;t++){
        com[t].clear();
        rep[t]=t;
        com[t].push_back(t);
      }
      for(int ii=0;ii<i;ii++){
        if(merge(edge[ii].first,edge[ii].second)==0){
          L[i]=m+1;
          break;
        }
      }
      if(L[i]==m+1)
        continue;
      for(int j=m-1;j>=i;j--){
        if(merge(edge[j].first,edge[j].second)==0){
          L[i]=j+1;
          break;
        }
      }
    }
    // for(int i=0;i<=m;i++){
    //   cout<<L[i]<<endl;
    // }
    for(int i=0;i<q;i++){
      int l,r;
      cin>>l>>r;
      if(r<L[l-1])
        cout<<"YES"<<endl;
      else
        cout<<"NO"<<endl;
    }
    return 0;
}

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