Submission #4034968

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Source Code Expand

#include<iostream>
using namespace std;
typedef long long ll;
#define fr(i,n) for(int i=0;i<n;i++)

int main(){
  int n,x;
  cin>>n>>x;
  if(x==1 || x==2*n-1) cout<<"No"<<endl;
  else{
    cout<<"Yes"<<endl;
    if(n<3){
      fr(i,3) cout<<i+1<<endl;
    }
    else if(x==2){
      fr(i,n-2) cout<<i+5<<endl;
      cout<<3<<endl;
      cout<<2<<endl;
      cout<<1<<endl;
      cout<<4<<endl;
      fr(i,n-3) cout<<i+n+3<<endl;
    }
    else{
      int j=1;
      fr(i,n-2){
        if(j==x-2) j+=4;
        cout<<j<<endl;
        j++;
      }
      cout<<x-1<<endl;
      cout<<x<<endl;
      cout<<x+1<<endl;
      cout<<x-2<<endl;
      fr(i,n-3){
        if(j==x-2) j+=4;
        cout<<j<<endl;
        j++;
      }
    }
  }
}

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