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

[Serializable]
public class ShuiWeiBianHuaData
{
    public string[] name;
    public double[] value;

    public void InverseAllData()
    {
        Array.Reverse(name);
        Array.Reverse(value);

    }

    public string GetYearRange()
    {
        var years = new HashSet<int>();

        foreach (var dateStr in name)
        {
            if (DateTime.TryParse(dateStr, out DateTime date))
            {
                years.Add(date.Year);
            }
        }

        if (years.Count == 0) return string.Empty;
        if (years.Count == 1) return years.First().ToString();

        var sortedYears = years.OrderBy(y => y).ToList();
        return $"{sortedYears[0]}-{sortedYears[1]}";
    }
}