oj.uz

답안 #930577

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
930577 2024-02-20T07:07:07 Z UmairAhmadMirza Joker (BOI20_joker) C++14
0 / 100
 402 ms 20004 KB 
#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<<a<<' '<<b<<endl;
  if(a==b){
    if(dep[ra]==dep[rb])
      return 0;
    return 1;
  }
  if(com[a].size()>com[b].size())
    swap(a,b);
  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;
    }
    for(int i=0;i<m;i++){
      int a,b;
      cin>>a>>b;
      if(a>b)
        swap(a,b);
      adj[a].push_back(b);
    }
    int k=0;
    for(int node=n-1;node>=1;node--){
      for(auto i:adj[node]){
        if(merge(i,node)==0){
          k=node;
          break;
        }
      }
    }
    // 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 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10588 KB Output is correct
2 Correct 3 ms 10588 KB Output is correct
3 Incorrect 3 ms 10588 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10588 KB Output is correct
2 Correct 3 ms 10588 KB Output is correct
3 Incorrect 3 ms 10588 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10588 KB Output is correct
2 Correct 3 ms 10588 KB Output is correct
3 Incorrect 402 ms 20004 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10588 KB Output is correct
2 Correct 3 ms 10588 KB Output is correct
3 Incorrect 3 ms 10588 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10588 KB Output is correct
2 Correct 3 ms 10588 KB Output is correct
3 Incorrect 3 ms 10588 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10588 KB Output is correct
2 Correct 3 ms 10588 KB Output is correct
3 Incorrect 3 ms 10588 KB Output isn't correct
4 Halted 0 ms 0 KB -