public class Racer : IComparable<Racer>, IFormattable
    {
        public Racer(string firstName = null, string lastName = null, string country = null, int starts = 0, int wins = 0, IEnumerable<int> years = null, IEnumerable<string> cars = null)
        {
            this.FirstName = firstName;
            this.LastName = lastName;
            this.Country = country;
            this.Starts = starts;
            this.Wins = wins;

            var yearsList = new List<int>();
            foreach (var year in years)
            {
                yearsList.Add(year);
            }
            this.Years = yearsList.ToArray();
            var carList = new List<string>();
            foreach (var car in cars)
            {
                carList.Add(car);
            }
            this.Cars = carList.ToArray();


        }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Country { get; set; }
        public int Wins { get; set; }//夺冠场数
        public int Starts { get; set; }//首发场数
        public string[] Cars { get; private set; }//赛车手获得冠军那一年使用的所有车型
        public int[] Years { get; private set; }//赛车手获得冠军的年份

        public override string ToString()
        {
            return String.Format("{0} {1}", FirstName, LastName);
        }

        public int CompareTo(Racer? other) => LastName.CompareTo(other?.LastName);

        public string ToString(string format) => ToString(format, null);

        public string ToString(string? format, IFormatProvider? formatProvider) =>
        format switch
        {
            null => ToString(),
            "N" => ToString(),
            "F" => FirstName,
            "L" => LastName,
            "C" => Country,
            "S" => Starts.ToString(),
            "W" => Wins.ToString(),
            "A" => $"{FirstName} {LastName}, country: {Country}, starts: {Starts}, wins: {Wins}",
            _ => throw new FormatException($"Format {format} not supported")
        };

        public static List<Racer> GetChampions() => new()
        {
            new("Nino", "Farina", "Italy", 33, 5, new[] { 1950 }, new[] { "Alfa Romeo" }),
            new("Alberto", "Ascari", "Italy", 32, 13, new[] { 1952, 1953 }, new[] { "Ferrari" }),
            new("Juan Manuel", "Fangio", "Argentina", 51, 24, new int[] { 1951, 1954, 1955, 1956, 1957 }, new string[] { "Alfa Romeo", "Maserati", "Mercedes", "Ferrari" }),
            new("Mike", "Hawthorn", "UK", 45, 3, new int[] { 1958 }, new string[] { "Ferrari" }),
            new("Phil", "Hill", "USA", 48, 3, new int[] { 1961 }, new string[] { "Ferrari" }),
            new("John", "Surtees", "UK", 111, 6, new int[] { 1964 }, new string[] { "Ferrari" }),
            new("Jim", "Clark", "UK", 72, 25, new int[] { 1963, 1965 }, new string[] { "Lotus" }),
            new("Jack", "Brabham", "Australia", 125, 14, new int[] { 1959, 1960, 1966 }, new string[] { "Cooper", "Brabham" }),
            new("Denny", "Hulme", "New Zealand", 112, 8, new int[] { 1967 }, new string[] { "Brabham" }),
            new("Graham", "Hill", "UK", 176, 14, new int[] { 1962, 1968 }, new string[] { "BRM", "Lotus" }),
            new("Jochen", "Rindt", "Austria", 60, 6, new int[] { 1970 }, new string[] { "Lotus" }),
            new("Jackie", "Stewart", "UK", 99, 27, new int[] { 1969, 1971, 1973 }, new string[] { "Matra", "Tyrrell" }),
            new("Emerson", "Fittipaldi", "Brazil", 144, 14, new int[] { 1972, 1974 }, new string[] { "Lotus", "McLaren" }),
            new("James", "Hunt", "UK", 92, 10, new int[] { 1976 }, new string[] { "McLaren" }),
            new("Mario", "Andretti", "USA", 128, 12, new int[] { 1978 }, new string[] { "Lotus" }),
            new("Jody", "Scheckter", "South Africa", 112, 10, new int[] { 1979 }, new string[] { "Ferrari" }),
            new("Alan", "Jones", "Australia", 116, 12, new int[] { 1980 }, new string[] { "Williams" }),
            new("Keke", "Rosberg", "Finland", 114, 5, new int[] { 1982 }, new string[] { "Williams" }),
            new("Niki", "Lauda", "Austria", 171, 25, new int[] { 1975, 1977, 1984 }, new string[] { "Ferrari", "McLaren" }),
            new("Nelson", "Piquet", "Brazil", 204, 23, new int[] { 1981, 1983, 1987 }, new string[] { "Brabham", "Williams" }),
            new("Ayrton", "Senna", "Brazil", 161, 41, new int[] { 1988, 1990, 1991 }, new string[] { "McLaren" }),
            new("Nigel", "Mansell", "UK", 187, 31, new int[] { 1992 }, new string[] { "Williams" }),
            new("Alain", "Prost", "France", 199, 51, new int[] { 1985, 1986, 1989, 1993 }, new string[] { "McLaren", "Williams" }),
            new("Damon", "Hill", "UK", 115, 22, new int[] { 1996 }, new string[] { "Williams" }),
            new("Jacques", "Villeneuve", "Canada", 163, 11, new int[] { 1997 }, new string[] { "Williams" }),
            new("Mika", "Hakkinen", "Finland", 161, 20, new int[] { 1998, 1999 }, new string[] { "McLaren" }),
            new("Michael", "Schumacher", "Germany", 306, 91, new int[] { 1994, 1995, 2000, 2001, 2002, 2003, 2004 }, new string[] { "Benetton", "Ferrari" }),
            new("Fernando", "Alonso", "Spain", 359, 32, new int[] { 2005, 2006 }, new string[] { "Renault" }),
            new("Kimi", "Räikkönen", "Finland", 349, 21, new int[] { 2007 }, new string[] { "Ferrari" }),
            new("Jenson", "Button", "UK", 306, 16, new int[] { 2009 }, new string[] { "Brawn GP" }),
            new("Sebastian", "Vettel", "Germany", 299, 53, new int[] { 2010, 2011, 2012, 2013 }, new string[] { "Red Bull Racing" }),
            new("Nico", "Rosberg", "Germany", 206, 24, new int[] { 2016 }, new string[] { "Mercedes" }),
            new("Lewis", "Hamilton", "UK", 314, 103, new int[] { 2008, 2014, 2015, 2017, 2018, 2019, 2020 }, new string[] { "McLaren", "Mercedes" }),
            new("Max", "Verstappen", "Netherlands", 167, 37, new int[] { 2021, 2022 }, new string[] { "Red Bull Racing" })
        };
    }