Submission #1750717

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

int main () {
	int n, x;
	cin >> n >> x;               
	if (x == n) {
		for (int i = 1;i <=  2 * n - 1;i ++) {
			cout << i << endl;
		}
		return 0;
	}
	if (x < n) {
		if (x == 1) {
			cout << "No";
			return 0;
		}
		int val = 0;
		for (int i = 1;i <= 2 * n - 1;i ++) {
			if (i == x || i == x - 1) continue;
			cout << i << endl;
			val ++;
			if (val == n - 2) {
				cout << x - 1 << endl << x << endl;
			}
		}
	} 
	if (x > n) {
		if (x == 2 * n - 1) {
			cout << "No";
			return 0;
		}
		int val = 0;
		for (int i = 1;i <= 2 * n - 1;i ++) {
			if (i == x || i == x + 1) continue;
			cout << i << endl;
			val ++;
			if (val == n - 1) {
				cout << x  << endl << x + 1 << endl;
			}
		}
	}
	return 0;
}

Submission Info

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