競プロ用べんりクラス

Benri.cs

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

public static class Benri
{
    public static class StdIn
    {
        public static int[] ReadStdIn()
        {
            string[] str = Console.ReadLine().Split(' ');

            List<int> list = new List<int>();
            foreach (var s in str)
            {
                try
                {
                    list.Add(int.Parse(s));
                }
                catch
                {
                    return null;
                }
            }

            return list.ToArray();
        }

        public static string[] ReadStdInStr()
        {
            string[] str = Console.ReadLine().Split(' ');

            List<string> list = new List<string>();
            foreach (var s in str)
            {
                try
                {
                    list.Add(s);
                }
                catch
                {
                    return null;
                }
            }

            return list.ToArray();
        }
    }

    public static class Sort
    {
        public static void RadixSort(ref int[] array)
        {
            var bucket = new List<int>[256];

            for (int d = 0, logR = 0; d < 4; d++, logR += 8)
            {
                for (int i = 0; i < array.Length; i++)
                {
                    int key = (array[i] >> logR) & 255;

                    if (bucket[key] == null)
                    {
                        bucket[key] = new List<int>();
                    }
                    bucket[key].Add(array[i]);
                }

                for (int j = 0, i = 0; j < bucket.Length; j++)
                {
                    if (bucket[j] != null)
                    {
                        foreach (int val in bucket[j])
                        {
                            array[i++] = val;
                        }
                    }
                }

                for (int j = 0; j < bucket.Length; j++)
                {
                    bucket[j] = null;
                }
            }
        }
    }
}