using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        for (var i = -100; i < 100; i++)

        {

            //Console.WriteLine(encode(i));

            Console.WriteLine(decode(encode(i)));

        }

    }

​

    static int encode(int n) => (n << 1) ^ (n >> 31);

    static int decode(int n) => (n >> 1) ^ (-(n & 1));

}