結果

問題 No.723 2つの数の和
ユーザー mnznmnzn
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 202 ms / 2,000 ms
コード長 5,743 bytes
コンパイル時間 1,138 ms
コンパイル使用メモリ 68,452 KB
実行使用メモリ 43,248 KB
最終ジャッジ日時 2023-09-17 05:26:59
合計ジャッジ時間 5,551 ms
ジャッジサーバーID
（参考情報） 		judge14 / judge12
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 67 ms
23,704 KB
testcase_01 AC 67 ms
21,784 KB
testcase_02 AC 66 ms
19,776 KB
testcase_03 AC 165 ms
38,232 KB
testcase_04 AC 188 ms
40,444 KB
testcase_05 AC 181 ms
39,904 KB
testcase_06 AC 189 ms
41,868 KB
testcase_07 AC 126 ms
29,400 KB
testcase_08 AC 135 ms
33,732 KB
testcase_09 AC 196 ms
43,248 KB
testcase_10 AC 123 ms
29,052 KB
testcase_11 AC 83 ms
21,000 KB
testcase_12 AC 143 ms
34,600 KB
testcase_13 AC 202 ms
41,548 KB
testcase_14 AC 106 ms
28,912 KB
testcase_15 AC 130 ms
31,236 KB
testcase_16 AC 159 ms
34,448 KB
testcase_17 AC 181 ms
39,764 KB
testcase_18 AC 113 ms
32,492 KB
testcase_19 AC 123 ms
38,308 KB
testcase_20 AC 65 ms
21,752 KB
testcase_21 AC 65 ms
21,680 KB
testcase_22 AC 64 ms
23,800 KB
testcase_23 AC 166 ms
41,348 KB
testcase_24 AC 114 ms
27,436 KB
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ソースコード

diff # 

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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