Submission #1356109

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
int a[1010000];
int main()
{
    int N, x;
    cin >> N >> x;
    if(N==1)
    {
        cout << "Yes" << endl << 1 << endl;
        return 0;
    }
    if(x==1 || x == 2*N-1)
    {
        cout << "No" << endl;
        return 0;
    }
    if(N==2)
    {
        cout << "Yes" << endl << 1 << endl << 2 << endl << 3 << endl;
        return 0;
    }
    if(x==2)
    {
        a[N-2] = 2; a[N-1] = 1;
        a[N-3] = 3; a[N] = 4;
        int cnt = 5;
        for(int i=0; i<N-3; ++i)
            a[i] = cnt++;
        for(int i=N+1; i<2*N-1; ++i)
            a[i] = cnt++;
    }
    else
    {
        a[N-2] = x; a[N-1] = x+1;
        a[N-3] = 1; a[N] = 2;
        int cnt = 3; if(cnt==x) cnt = x+2;
        for(int i=0; i<N-3; ++i)
        {
            a[i] = cnt;
            if(cnt==x-1) cnt = x+2;
            else ++cnt;
        }
        for(int i=N+1; i<2*N-1; ++i)
        {
            a[i] = cnt;
            if(cnt==x-1) cnt = x+2;
            else ++cnt;
        }
    }
    cout << "Yes" << endl;
    for(int i=0; i<2*N-1; ++i)
        cout << a[i] << endl;
}

Submission Info

Judge Result