#276527 (C#(csc)) No.723 2つの数の和

• 問題: No.723 2つの数の和
• ユーザー: sekiya9311
• 提出日時: 2018-08-03 22:46:32
• 言語: C#(csc) (csc 3.9.0)
• 結果: AC
• 実行時間: 71 ms / 2,000 ms
• コード長: 7,642 bytes
• コンパイル時間: 1,252 ms
• コンパイル使用メモリ: 112,384 KB
• 実行使用メモリ: 32,128 KB
• 最終ジャッジ日時: 2024-09-19 17:33:11
• 合計ジャッジ時間: 3,625 ms
• ジャッジサーバーID （参考情報）: judge1 / judge4

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	27 ms; 19,172 KB
testcase_01	AC	28 ms; 19,040 KB
testcase_02	AC	29 ms; 19,168 KB
testcase_03	AC	56 ms; 28,288 KB
testcase_04	AC	66 ms; 30,208 KB
testcase_05	AC	65 ms; 29,696 KB
testcase_06	AC	64 ms; 30,080 KB
testcase_07	AC	47 ms; 24,832 KB
testcase_08	AC	54 ms; 25,088 KB
testcase_09	AC	68 ms; 30,464 KB
testcase_10	AC	48 ms; 24,576 KB
testcase_11	AC	37 ms; 20,736 KB
testcase_12	AC	52 ms; 25,472 KB
testcase_13	AC	67 ms; 30,592 KB
testcase_14	AC	41 ms; 22,272 KB
testcase_15	AC	47 ms; 24,960 KB
testcase_16	AC	54 ms; 26,240 KB
testcase_17	AC	60 ms; 29,312 KB
testcase_18	AC	61 ms; 28,288 KB
testcase_19	AC	71 ms; 32,128 KB
testcase_20	AC	29 ms; 19,412 KB
testcase_21	AC	30 ms; 19,164 KB
testcase_22	AC	28 ms; 19,432 KB
testcase_23	AC	66 ms; 30,848 KB
testcase_24	AC	41 ms; 22,784 KB

コンパイルメッセージ

Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc)
Copyright (C) Microsoft Corporation. All rights reserved.

ソースコード

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

namespace ProgrammingContest
{
    class Writer : IDisposable
    {
        private readonly System.IO.TextWriter writer;
        private StringBuilder sb;
        private readonly bool isReactive;
        public Writer(string path)
            : this(new System.IO.StreamWriter(path))
        {
        }
        public Writer(bool isReactive)
            : this(null, isReactive)
        {
        }
        public Writer(System.IO.TextWriter writer = null,
                        bool isReactive = false)
        {
            this.writer = (writer ?? Console.Out);
            this.isReactive = isReactive;
            if (!this.isReactive)
            {
                this.sb = new StringBuilder();
            }
        }
        public void Dispose()
        {
            if (!this.isReactive)
            {
                this.writer.Write(sb.ToString());
            }
            if (!this.writer.Equals(Console.Out))
            {
                this.writer.Dispose();
            }
        }
        public void Write(object val)
        {
            if (this.isReactive)
            {
                this.writer.Write(val.ToString());
                this.writer.Flush();
            }
            else
            {
                this.sb.Append(val.ToString());
            }
        }
        public void Write(string format, params object[] vals)
        {
            if (this.isReactive)
            {
                this.writer.Write(format, vals);
                this.writer.Flush();
            }
            else
            {
                this.sb.AppendFormat(format, vals);
            }
        }
        public void WriteLine(object val = null)
        {
            this.Write((val ?? string.Empty).ToString() + Environment.NewLine);
        }
        public void WriteLine(int val)
        {
            this.WriteLine(val.ToString());
        }
        public void WriteLine(long val)
        {
            this.WriteLine(val.ToString());
        }
        public void WriteLine(string val)
        {
            this.WriteLine((object)val);
        }
        public void WriteLine(string format, params object[] vals)
        {
            this.Write(format + Environment.NewLine, vals);
        }
    }

    class Scanner : IDisposable
    {
        private readonly Queue<string> buffer;
        private readonly char[] sep;
        private readonly System.IO.TextReader reader;
        public Scanner(string path, char[] sep = null)
            : this(new System.IO.StreamReader(path), sep)
        {
        }
        public Scanner(System.IO.TextReader reader = null,
                        char[] sep = null)
        {
            this.buffer = new Queue<string>();
            this.sep = (sep ?? new char[] { ' ' });
            this.reader = (reader ?? Console.In);
        }
        private void CheckBuffer()
        {
            if (this.buffer.Count == 0 && this.reader.Peek() != -1)
            {
                string str = string.Empty;
                for (; string.IsNullOrEmpty(str) || string.IsNullOrWhiteSpace(str);
                    str = this.reader.ReadLine()) ;

                str.Split(this.sep).Where(el => !(string.IsNullOrEmpty(el) || string.IsNullOrWhiteSpace(el)))
                   .ToList().ForEach(el => this.buffer.Enqueue(el));
            }
        }

        public void Dispose()
        {
            if (!this.reader.Equals(Console.In))
            {
                this.reader.Dispose();
            }
        }

        public string Next
        {
            get
            {
                this.CheckBuffer();
                return this.buffer.Dequeue();
            }
        }
        public string[] GetStringArray(int N)
        {
            return Enumerable.Range(0, N)
                             .Select(e => this.Next)
                             .ToArray();
        }

        public int NextInt
        {
            get
            {
                return int.Parse(this.Next);
            }
        }
        public int[] GetIntArray(int N)
        {
            return Enumerable.Range(0, N)
                             .Select(e => this.NextInt)
                             .ToArray();
        }

        public double NextDouble
        {
            get
            {
                return double.Parse(this.Next);
            }
        }
        public double[] GetdoubleArray(int N)
        {
            return Enumerable.Range(0, N)
                             .Select(e => this.NextDouble)
                             .ToArray();
        }

        public long NextLong
        {
            get
            {
                return long.Parse(this.Next);
            }
        }
        public long[] GetLongArray(int N)
        {
            return Enumerable.Range(0, N)
                             .Select(e => this.NextLong)
                             .ToArray();
        }

        public bool IsEnd
        {
            get
            {
                this.CheckBuffer();
                return this.buffer.Count == 0;
            }
        }
    }

    class MainClass : IDisposable
    {
        Scanner sc;
        Writer wr;
        const string backPath = "..";
        private readonly char dirSep = System.IO.Path.DirectorySeparatorChar;
        private readonly string inFilePath = string.Empty;
        private readonly string outFilePath = string.Empty;
        public MainClass()
        {
            this.inFilePath = MainClass.backPath
                            + this.dirSep
                            + MainClass.backPath
                            + this.dirSep
                            + "in.txt";
            this.outFilePath = MainClass.backPath
                             + this.dirSep
                             + MainClass.backPath
                             + this.dirSep
                             + "out.txt";

            this.wr = new Writer(this.IsReactive);
            //this.wr = new Writer(this.outFilePath);
#if DEBUG
            if (!this.IsReactive)
            {
                this.sc = new Scanner(this.inFilePath);
            }
            else
            {
                this.sc = new Scanner();
            }
#else
            this.sc = new Scanner();
#endif
        }
        static void Main(string[] args)
        {
            using (var mainClass = new MainClass())
            {
                mainClass.Solve();
            }
        }

        public void Dispose()
        {
            this.sc?.Dispose();
            this.sc = null;
            this.wr?.Dispose();
            this.wr = null;
#if DEBUG
            Console.WriteLine("press any key to continue...");
            Console.ReadKey();
#endif
        }

        void MakeTestCase()
        {
            var rand = new Random();
            this.wr?.Dispose();
            this.wr = new Writer(inFilePath);
        }

        void Solve()
        {
            int N = sc.NextInt;
            long X = sc.NextLong;
            var a = sc.GetIntArray(N);
            var cnt = new int[(int)1e5 + 10];
            foreach (var e in a)
            {
                cnt[e]++;
            }
            long ans = 0;
            for (int i = 0; i < cnt.Length; i++)
            {
                if (X - i >= 0 && X - i < cnt.Length && cnt[i] > 0)
                {
                    ans += 1L * cnt[i] * cnt[X - i];
                }
            }
            wr.WriteLine(ans);
        }

        private bool IsReactive { get; } = false; // TODO: reactive check !!
    }
}