Submission #3548765

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Source Code Expand

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define int long long
typedef long long lint;
typedef pair<int,int> P;
const int    INF=(int)1e9;
const int    MOD=(int)1e9+7;
const double EPS=(double)1e-10;
const int    dx[]={-1,0,0,1};
const int    dy[]={0,-1,1,0};
struct Accelerate_Cin{
    Accelerate_Cin(){
        cin.tie(0);ios::sync_with_stdio(0);cout<<fixed<<setprecision(20);
    };
};

int N;
int a,b;
int K;

signed main(){
  cin>>N>>a>>b;
  cin>>K;

  set<int>s;
  s.insert(a);
  s.insert(b);
  for(int i=0;i<K;i++){
    int p;cin>>p;
    s.insert(p);
  }

  if(s.size()!=K+2){
    cout<<"NO"<<endl;
  }else{
    cout<<"YES"<<endl;
  }

  return 0;
}

Submission Info

Judge Result