#502679 (C#(csc)) No.723 2つの数の和

• 問題: No.723 2つの数の和
• ユーザー: mnzn
• 提出日時: 2020-06-26 16:48:25
• 言語: C#(csc) (csc 3.9.0)
• 結果: AC
• 実行時間: 158 ms / 2,000 ms
• コード長: 5,743 bytes
• コンパイル時間: 980 ms
• コンパイル使用メモリ: 113,836 KB
• 実行使用メモリ: 47,120 KB
• 最終ジャッジ日時: 2024-07-04 02:47:34
• 合計ジャッジ時間: 4,083 ms
• ジャッジサーバーID （参考情報）: judge4 / judge2

ファイルパターン	結果
sample	AC * 3
other	AC * 22

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

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using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Program
{
    static void Main(string[] args)
    {
        var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);
        Solve();
        Console.Out.Flush();
    }
    static void Solve()
    {
        var N = sc.ReadInt();
        var X = sc.ReadLong();
        var A = sc.ReadLongArray(N);
        var compress = new Compress<long>();
        for (int i = 0; i < N; i++)
        {
            compress.Add(A[i]);
            compress.Add(X - A[i]);
        }
        compress.Build();
        var count = new int[compress.Compressed.Length];
        for (int i = 0; i < N; i++)
        {
            var val = compress.Get(A[i]);
            count[val]++;
        }
        var ans = 0L;
        for (int i = 0; i < N; i++)
        {
            var y = X - A[i];
            var valy = compress.Get(y);
            ans += count[valy];
        }
        Console.WriteLine(ans);
    }
    class Compress<T> where T : IComparable<T>
    {
        public List<T> A = new List<T>();
        public T[] Compressed;
        public void Add(T x) { this.A.Add(x); }
        public void Add(IEnumerable<T> x) { this.A.AddRange(x); }
        public T[] Build()
        {
            // TLEする ... this.Compressed = this.A.Distinct().OrderBy(a => a).ToArray();
            this.Compressed = this.A.Distinct().ToArray();
            Array.Sort(this.Compressed);
            return this.Compressed;
        }
        public int Get(T x)
        {
            if (this.Compressed == null) this.Build();
            var l = -1;
            var r = Compressed.Length;
            while (r - l > 1)
            {
                var mid = l + (r - l) / 2;
                var v = Compressed[mid];
                if (x.CompareTo(v) <= 0) r = mid;
                else l = mid;
            }
            return r;
        }
        public T this[int i] { get { return this.Compressed[i]; } }
    }
    static Scanner sc = new Scanner();
}
class Scanner
{
    string[] S = new string[0];
    int Index = 0;
    char[] Separators = new char[] { ' ' };
    public string Next()
    {
        if (this.Index < this.S.Length) return this.S[this.Index++];
        var line = "";
        while (line == "") line = Console.ReadLine();
        this.S = line.Split(this.Separators, StringSplitOptions.RemoveEmptyEntries);
        if (this.S.Length == 0) return this.Next();
        this.Index = 0;
        return this.S[this.Index++];
    }
    public string ReadStr()
    {
        return this.Next();
    }
    public char ReadChar()
    {
        return this.Next()[0];
    }
    public int ReadInt()
    {
        return int.Parse(this.Next());
    }
    public uint ReadUInt()
    {
        return uint.Parse(this.Next());
    }
    public long ReadLong()
    {
        return long.Parse(this.Next());
    }
    public double ReadDouble()
    {
        return double.Parse(this.Next());
    }
    public Tuple<int, int> ReadTup(int add = 0)
    {
        return Tuple.Create(this.ReadInt() + add, this.ReadInt() + add);
    }
    public Tuple<long, long> ReadTupLong(int add = 0)
    {
        return Tuple.Create(this.ReadLong() + add, this.ReadLong() + add);
    }
    public Tuple<int, int, int> ReadTup3(int add = 0)
    {
        return Tuple.Create(this.ReadInt() + add, this.ReadInt() + add, this.ReadInt() + add);
    }
    public Tuple<int, int, int, int> ReadTup4(int add = 0)
    {
        return Tuple.Create(this.ReadInt() + add, this.ReadInt() + add, this.ReadInt() + add, this.ReadInt() + add);
    }
    public int[] ReadIntArray(int n)
    {
        var array = new int[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadInt();
        }
        return array;
    }
    public long[] ReadLongArray(int n)
    {
        var array = new long[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadLong();
        }
        return array;
    }
    public double[] ReadDoubleArray(int n)
    {
        var array = new double[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadDouble();
        }
        return array;
    }
    public char[] ReadCharArray(int n)
    {
        var array = new char[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadChar();
        }
        return array;
    }
    public string[] ReadStrArray(int n)
    {
        var array = new string[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadStr();
        }
        return array;
    }
    public Tuple<long, long>[] ReadTupLongArray(int n, int add = 0)
    {
        var array = new Tuple<long, long>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTupLong(add);
        }
        return array;
    }
    public Tuple<int, int>[] ReadTupArray(int n, int add = 0)
    {
        var array = new Tuple<int, int>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTup(add);
        }
        return array;
    }
    public Tuple<int, int, int>[] ReadTup3Array(int n, int add = 0)
    {
        var array = new Tuple<int, int, int>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTup3(add);
        }
        return array;
    }
    public Tuple<int, int, int, int>[] ReadTup4Array(int n, int add = 0)
    {
        var array = new Tuple<int, int, int, int>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTup4(add);
        }
        return array;
    }
}
 
 
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