MyProject

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace mainSolution
{
    class Input
    {
        private static IEnumerator<string> getin()
        {
            while (true)
                foreach (string s in Console.ReadLine().Split().Where(x => x.Length > 0))
                    yield return s;
        }

        private IEnumerator<string> inp = getin();

        public string GetString() { inp.MoveNext(); return inp.Current; }
        public int GetInt() { return int.Parse(GetString()); }
        public long GetLong() { return long.Parse(GetString()); }
        public double GetDouble() { return double.Parse(GetString()); }
    }
    class Tree
    {
        public List<List<int>> g = new List<List<int>>();
        private List<int> parent = new List<int> ();
        private List<bool> used = new List<bool> ();

        private int size = 0;
        bool isChanged = false;



        public Tree() { }
        public Tree(int size)
        {
            setSize(size);
            Initialize();
            isChanged = true;
        }


        private void changeTree(int size)
        {
            g.RemoveRange(size, this.size - size);
            parent.RemoveRange(size, this.size - size);
            used.RemoveRange(size, this.size - size);
        }
        public void setSize(int size)
        {
            //this.size = size;
            if (this.size > size)
            {
                changeTree(size);
            }
            this.size = size;
            isChanged = true;
        }
        private void Initialize()
        {
            for (int i = 0; i < size; i++)
            {
                g.Add(new List<int>());
                parent.Add(new int());
                used.Add(new bool());
            }
        }



    }
    static class Program
    {



        static void Main(string[] args)
        {
            Tree tree = new Tree();
            tree.setSize(10);
        }


    }
}