using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> nums = new List<int>{1,2,1,3,3,2};

        SortedSet<int> pq = new SortedSet<int>(Comparer<int>.Create(

            (x,y) => nums[x] != nums[y] ? nums[x]-nums[y] : x-y

        ));

        for (int i=0; i<nums.Count; i++) pq.Add(i);

        while (pq.Any())

        {

            Console.Write(nums[pq.Min] + " ");

            pq.Remove(pq.Min);

        }

    }

}