Submission #954980

---

Source Code Expand

#include<bits/stdc++.h>

using namespace std;

const int MAXN = 3e5 + 10;

int n, x, sec[MAXN], sz;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin >> n >> x;
	if (n == 2){
		if (x == 2){
			cout << "Yes\n";
			cout << "1\n2\n3\n";
		}
		else
			cout << "No\n";
		return 0;
	}
	int mx = n+n-1;
	if (x == 1 || x == mx){
		cout << "No\n";
		return 0;
	}
	cout << "Yes\n";
	for (int i = 1; i <= mx; i++)
		if (i < x - 2 || i > x + 2)	sec[sz++] = i;

	for (int i = 0; i < sz/2; i++)
		cout << sec[i] << "\n";
	if (x + 2 <= mx)
		cout << x+2 << "\n";
	cout << x - 1 << "\n";
	cout << x << "\n";
	cout << x + 1 << "\n";
	if (x - 2 > 0)
		cout << x - 2 << "\n";
	for (int i = sz/2; i < sz; i++)
		cout << sec[i] << "\n";
	return 0;
}

Submission Info

Judge Result