結果

問題 No.723 2つの数の和
ユーザー mnznmnzn
提出日時 2020-06-26 16:43:06
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 114 ms / 2,000 ms
コード長 4,896 bytes
コンパイル時間 958 ms
コンパイル使用メモリ 66,352 KB
実行使用メモリ 40,012 KB
最終ジャッジ日時 2023-09-17 05:19:25
合計ジャッジ時間 4,284 ms
ジャッジサーバーID
（参考情報） 		judge15 / judge14
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 54 ms
22,748 KB
testcase_01 AC 54 ms
22,908 KB
testcase_02 AC 57 ms
20,876 KB
testcase_03 AC 102 ms
36,504 KB
testcase_04 AC 112 ms
36,204 KB
testcase_05 AC 103 ms
38,848 KB
testcase_06 AC 106 ms
38,048 KB
testcase_07 AC 82 ms
27,260 KB
testcase_08 AC 85 ms
27,932 KB
testcase_09 AC 110 ms
36,236 KB
testcase_10 AC 87 ms
27,080 KB
testcase_11 AC 66 ms
22,156 KB
testcase_12 AC 92 ms
32,580 KB
testcase_13 AC 114 ms
40,012 KB
testcase_14 AC 72 ms
25,444 KB
testcase_15 AC 81 ms
25,628 KB
testcase_16 AC 93 ms
34,220 KB
testcase_17 AC 105 ms
36,636 KB
testcase_18 AC 90 ms
25,928 KB
testcase_19 AC 98 ms
31,776 KB
testcase_20 AC 55 ms
20,748 KB
testcase_21 AC 54 ms
20,796 KB
testcase_22 AC 58 ms
20,924 KB
testcase_23 AC 103 ms
39,532 KB
testcase_24 AC 77 ms
28,028 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 map = new HashMap<long, int>();
        var ans = 0L;
        for (int i = 0; i < N; i++)
        {
            map[A[i]]++;
        }
        for (int i = 0; i < N; i++)
        {
            ans += map[X - A[i]];
        }
        Console.WriteLine(ans);
    }
    class HashMap<K, V> : Dictionary<K, V> where V : new()
    {
        private V DefaltValue = new V();
        public HashMap() { }
        public HashMap(V defaultValue)
        {
            this.DefaltValue = new V();
        }
        new public V this[K i]
        {
            get
            {
                V v;
                return TryGetValue(i, out v) ? v : base[i] = this.DefaltValue;
            }
            set { base[i] = value; }
        }
    }
    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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