杭电2019

#include <iostream>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <climits>
#include <stdio.h>
#include <string.h>
#include <list>

using namespace std;

int main()
{
    list<int> a;
    int n,m,t;
    while(cin >> n >> m && (n!=0||m!=0))
    {
        a.clear();
        while(n--)
        {
            cin>>t;
            a.push_back(t);
        }
        a.push_back(m);
        a.sort();
        for(list<int>::iterator it = a.begin();it!=a.end();++it)
        {
            cout << *it;
            advance(it,1);
            if (it!=a.end()) cout << ‘ ‘;
            else cout << endl;
            advance(it,-1);
        }
    }

    return 0;
}