結果

問題 No.723 2つの数の和
ユーザー AreTrashAreTrash
提出日時 2019-01-17 16:05:08
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 211 ms / 2,000 ms
コード長 3,718 bytes
コンパイル時間 3,361 ms
コンパイル使用メモリ 110,748 KB
実行使用メモリ 41,544 KB
最終ジャッジ日時 2023-09-14 01:59:41
合計ジャッジ時間 7,597 ms
ジャッジサーバーID
(参考情報)
judge11 / judge15
このコードへのチャレンジ(β)

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 68 ms
21,712 KB
testcase_01 AC 69 ms
21,832 KB
testcase_02 AC 68 ms
21,768 KB
testcase_03 AC 172 ms
37,136 KB
testcase_04 AC 205 ms
37,564 KB
testcase_05 AC 192 ms
36,656 KB
testcase_06 AC 199 ms
39,072 KB
testcase_07 AC 129 ms
32,952 KB
testcase_08 AC 136 ms
33,700 KB
testcase_09 AC 207 ms
37,856 KB
testcase_10 AC 128 ms
30,708 KB
testcase_11 AC 87 ms
26,816 KB
testcase_12 AC 145 ms
34,228 KB
testcase_13 AC 211 ms
38,360 KB
testcase_14 AC 106 ms
28,472 KB
testcase_15 AC 130 ms
31,092 KB
testcase_16 AC 161 ms
35,312 KB
testcase_17 AC 188 ms
38,300 KB
testcase_18 AC 182 ms
37,940 KB
testcase_19 AC 192 ms
41,544 KB
testcase_20 AC 66 ms
21,772 KB
testcase_21 AC 67 ms
21,764 KB
testcase_22 AC 67 ms
21,716 KB
testcase_23 AC 199 ms
40,416 KB
testcase_24 AC 113 ms
31,168 KB
権限があれば一括ダウンロードができます
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

diff #

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

namespace No723
{
    public class Program
    {
        void Solve(StreamScanner ss, StreamWriter sw)
        {
            //---------------------------------
            var N = ss.Next(int.Parse);
            var X = ss.Next(long.Parse);
            var A = ss.Next(long.Parse, N).OrderBy(x => x).ToArray();

            var ret = 0L;
            for (var i = 0; i < N; i++) ret += BinarySearch.Range(x => A[i] + A[x], X, X, 0, N);
            sw.WriteLine(ret);
            //---------------------------------
        }

        static void Main()
        {
            var ss = new StreamScanner(new StreamReader(Console.OpenStandardInput()));
            var sw = new StreamWriter(Console.OpenStandardOutput()) {AutoFlush = false};
            new Program().Solve(ss, sw);
            sw.Flush();
        }
    }

    public static partial class BinarySearch
    {
        static long BoundToTheRight(Func<long, bool> pred, long left, long right)
        {
            if (left > right) throw new ArgumentException("left must <= right");

            while (true)
            {
                if (left == right) return right;
                var mid = (left + right - 1) >> 1;
                if (pred(mid)) right = mid;
                else left = mid + 1;
            }
        }

        public static long LowerBound<T>(Func<long, T> func, T value, long left, long right) where T : IComparable<T>
        {
            return BoundToTheRight(x => func(x).CompareTo(value) >= 0, left, right);
        }

        public static long UpperBound<T>(Func<long, T> func, T value, long left, long right) where T : IComparable<T>
        {
            return BoundToTheRight(x => func(x).CompareTo(value) > 0, left, right);
        }

        public static long Range<T>(Func<long, T> func, T vLeft, T vRight, long inLeft, long inRight) where T : IComparable<T>
        {
            return UpperBound(func, vRight, inLeft, inRight) - LowerBound(func, vLeft, inLeft, inRight);
        }

        public static int LowerBound<T>(this T[] source, T value) where T : IComparable<T>
        {
            return (int)LowerBound(x => source[x], value, 0, source.Length);
        }

        public static int UpperBound<T>(this T[] source, T value) where T : IComparable<T>
        {
            return (int)UpperBound(x => source[x], value, 0, source.Length);
        }

        public static int Range<T>(this T[] source, T vLeft, T vRight) where T : IComparable<T>
        {
            return source.UpperBound(vRight) - source.LowerBound(vLeft);
        }
    }

    public class StreamScanner
    {
        static readonly char[] Sep = {' '};
        readonly Queue<string> buffer = new Queue<string>();
        readonly TextReader textReader;

        public StreamScanner(TextReader textReader)
        {
            this.textReader = textReader;
        }

        public T Next<T>(Func<string, T> parser)
        {
            if (buffer.Count != 0) return parser(buffer.Dequeue());
            var nextStrings = textReader.ReadLine().Split(Sep, StringSplitOptions.RemoveEmptyEntries);
            foreach (var nextString in nextStrings) buffer.Enqueue(nextString);
            return Next(parser);
        }

        public T[] Next<T>(Func<string, T> parser, int x)
        {
            var ret = new T[x];
            for (var i = 0; i < x; ++i) ret[i] = Next(parser);
            return ret;
        }

        public T[][] Next<T>(Func<string, T> parser, int x, int y)
        {
            var ret = new T[y][];
            for (var i = 0; i < y; ++i) ret[i] = Next(parser, x);
            return ret;
        }
    }
}
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