Submission #1609950

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int n, x, ans[1<<20];

int main() {
    cin >> n >> x;
    if (x == 1 || x == n+n-1) {
        cout << "No";
        return 0;
    } else cout << "Yes\n";
    if (n == 2) { cout << "1\n2\n3"; return 0; }
    if (x == 2) ans[n-1] = x, ans[n-2] = x+1, ans[n] = x-1, ans[n+1] = x+2;
    else ans[n-1] = x, ans[n-2] = x-1, ans[n] = x+1, ans[n+1] = x-2;
    
    for (int i = 0, k = 1; i < n+n-1; i++) {
        if (k == ans[n+1] || k == ans[n]) k += 4;
        if (ans[i]) i += 3;
        else ans[i] = k++;
    }
    for (int i = 0; i < n+n-1; i++) cout << ans[i] << '\n';
}

Submission Info

Judge Result