提出 #39236592

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ソースコード 拡げる

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

namespace xxx
{
    internal class Program
    {
        static void Main(string[] args)
        {
            AL.SetCase();
            int N = AL.ReadInt();
            int[] xs = AL.ReadIntArray();
            Array.Sort(xs);
            var segment = new ArraySegment<int>(xs, N, N * 3);
            var sum = segment.Sum();

            Console.WriteLine((double)(sum)/(N*3));
        }
    }
    static class AL
    {
        public static void SetCase()
        {
#if DEBUG
            Console.WriteLine("Case?");
            var name = Console.ReadLine();
            if (string.IsNullOrWhiteSpace(name))
            {
                Console.WriteLine("Using stdin");
                return;
            }
            var exStdIn = new System.IO.StreamReader($"../../../{name}.txt");
            System.Console.SetIn(exStdIn);
#endif
        }
        public static int ReadInt()
        {
            return int.Parse(Console.ReadLine());
        }

        public static int[] ReadIntChars()
        {
            // 102 => int[]{1, 0, 2}
            return Console.ReadLine().ToCharArray().Select(c => int.Parse(c.ToString())).ToArray();
        }


        public static int[] ReadIntArray()
        {
            // 12 34 56 => int[]{12, 34, 56}
            return Console.ReadLine().Split().Select(int.Parse).ToArray();
        }

        public static (int a, int b) ReadInt2()
        {
            var ia = ReadIntArray();
            if (ia.Length != 2)
            {
                throw new InvalidCastException();
            }
            return (ia[0], ia[1]);
        }
        public static (int a, int b, int c) ReadInt3()
        {
            var ia = ReadIntArray();
            if (ia.Length != 3)
            {
                throw new InvalidCastException();
            }
            return (ia[0], ia[1], ia[2]);
        }
    }
    public class DefaultDictionary<TKey, TValue> : Dictionary<TKey, TValue> where TValue : new()
    {
        public new TValue this[TKey key]
        {
            get
            {
                if (!TryGetValue(key, out TValue val))
                {
                    val = new TValue();
                    Add(key, val);
                }
                return val;
            }
            set { base[key] = value; }
        }
    }
}

提出情報

ジャッジ結果