結果

問題 No.1282 Display Elements
ユーザー 👑 terry_u16terry_u16
提出日時 2020-11-06 21:57:52
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 280 ms / 2,000 ms
コード長 11,841 bytes
コンパイル時間 2,559 ms
コンパイル使用メモリ 113,924 KB
実行使用メモリ 50,304 KB
最終ジャッジ日時 2023-09-29 18:41:53
合計ジャッジ時間 6,801 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge11
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 59 ms
21,676 KB
testcase_01 AC 59 ms
21,580 KB
testcase_02 AC 60 ms
21,696 KB
testcase_03 AC 57 ms
21,596 KB
testcase_04 AC 59 ms
23,596 KB
testcase_05 AC 57 ms
23,756 KB
testcase_06 AC 55 ms
19,520 KB
testcase_07 AC 57 ms
23,688 KB
testcase_08 AC 56 ms
21,596 KB
testcase_09 AC 57 ms
21,764 KB
testcase_10 AC 63 ms
21,804 KB
testcase_11 AC 68 ms
21,764 KB
testcase_12 AC 58 ms
21,568 KB
testcase_13 AC 64 ms
21,720 KB
testcase_14 AC 65 ms
21,824 KB
testcase_15 AC 260 ms
44,844 KB
testcase_16 AC 130 ms
32,856 KB
testcase_17 AC 216 ms
46,192 KB
testcase_18 AC 158 ms
34,828 KB
testcase_19 AC 174 ms
49,160 KB
testcase_20 AC 171 ms
46,168 KB
testcase_21 AC 264 ms
50,304 KB
testcase_22 AC 181 ms
48,360 KB
testcase_23 AC 280 ms
50,284 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.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using YukicoderContest273.Extensions;
using YukicoderContest273.Questions;

namespace YukicoderContest273.Questions
{
    public class QuestionD : AtCoderQuestionBase
    {
        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var n = inputStream.ReadInt();
            var a = inputStream.ReadIntArray();
            var b = inputStream.ReadIntArray();

            Array.Sort(a);
            var ab = new int[2 * n];

            for (int i = 0; i < a.Length; i++)
            {
                ab[i] = a[i];
            }

            for (int i = 0; i < b.Length; i++)
            {
                ab[n + i] = b[i];
            }

            var comp = new CompressedCoordinate<int>(ab);

            var bit = new BinaryIndexedTree(comp.Count);

            long result = 0;

            for (int i = 0; i < a.Length; i++)
            {
                bit[comp[n + i]]++;
                result += bit.Sum(comp[i]);
            }

            yield return result;
        }

        public class CompressedCoordinate<T> where T : IComparable<T>, IEquatable<T>
        {
            readonly int[] _compressed;
            readonly T[] _expander;
            public int Count => _expander.Length;

            public CompressedCoordinate(T[] data)
            {
                _expander = data.ToArray().Distinct().ToArray();
                Array.Sort(_expander);

                _compressed = new int[data.Length];
                var span = _expander.AsSpan();
                for (int i = 0; i < _compressed.Length; i++)
                {
                    _compressed[i] = span.BinarySearch(data[i]);
                }
            }

            public int this[int index] => _compressed[index];
            public T Expand(int compressedValue) => _expander[compressedValue];
        }

        public class BinaryIndexedTree
        {
            long[] _data;
            public int Length { get; }

            public BinaryIndexedTree(int length)
            {
                _data = new long[length + 1];   // 内部的には1-indexedにする
                Length = length;
            }

            public BinaryIndexedTree(IEnumerable<long> data, int length) : this(length)
            {
                var count = 0;
                foreach (var n in data)
                {
                    AddAt(count++, n);
                }
            }

            public BinaryIndexedTree(ICollection<long> collection) : this(collection, collection.Count) { }

            public long this[int index]
            {
                get => Sum(index, index + 1);
                set => AddAt(index, value - this[index]);
            }

            /// <summary>
            /// BITの<c>index</c>番目の要素に<c>n</c>を加算します。
            /// </summary>
            /// <param name="index">加算するインデックス（0-indexed）</param>
            /// <param name="value">加算する数</param>
            public void AddAt(int i, long value)
            {
                unchecked
                {
                    if ((uint)i >= (uint)Length)
                    {
                        throw new ArgumentOutOfRangeException(nameof(i));
                    }
                }

                i++;  // 1-indexedにする

                while (i <= Length)
                {
                    _data[i] += value;
                    i += i & -i;    // LSBの加算
                }
            }

            /// <summary>
            /// [0, <c>end</c>)の部分和を返します。
            /// </summary>
            /// <param name="end">部分和を求める半開区間の終了インデックス</param>
            /// <returns>区間の部分和</returns>
            public long Sum(int i)
            {
                unchecked
                {
                    if ((uint)i >= (uint)_data.Length)
                    {
                        throw new ArgumentOutOfRangeException(nameof(i));
                    }
                }

                long sum = 0;
                while (i > 0)
                {
                    sum += _data[i];
                    i -= i & -i;    // LSBの減算
                }
                return sum;
            }

            /// <summary>
            /// [<c>start</c>, <c>end</c>)の部分和を返します。
            /// </summary>
            /// <param name="start">部分和を求める半開区間の開始インデックス</param>
            /// <param name="end">部分和を求める半開区間の終了インデックス</param>
            /// <returns>区間の部分和</returns>
            public long Sum(int start, int end) => Sum(end) - Sum(start);
        }
    }
}

namespace YukicoderContest273
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionD();
            var answers = question.Solve(Console.In);

            var writer = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            Console.SetOut(writer);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
            Console.Out.Flush();
        }
    }
}

#region Base Class

namespace YukicoderContest273.Questions
{

    public interface IAtCoderQuestion
    {
        IEnumerable<object> Solve(string input);
        IEnumerable<object> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<object> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<object> Solve(TextReader inputStream);
    }
}

#endregion

#region Extensions

namespace YukicoderContest273.Extensions
{
    public static class StringExtensions
    {
        public static string Join<T>(this IEnumerable<T> source) => string.Concat(source);
        public static string Join<T>(this IEnumerable<T> source, char separator) => string.Join(separator, source);
        public static string Join<T>(this IEnumerable<T> source, string separator) => string.Join(separator, source);
    }

    public static class TextReaderExtensions
    {
        public static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        public static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        public static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        public static string ReadString(this TextReader reader) => reader.ReadLine();

        public static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        public static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        public static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        public static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);

        // Supports primitive type only.
        public static T1 ReadValue<T1>(this TextReader reader) => (T1)Convert.ChangeType(reader.ReadLine(), typeof(T1));

        public static (T1, T2) ReadValue<T1, T2>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            return (v1, v2);
        }

        public static (T1, T2, T3) ReadValue<T1, T2, T3>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
            return (v1, v2, v3);
        }

        public static (T1, T2, T3, T4) ReadValue<T1, T2, T3, T4>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
            var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
            return (v1, v2, v3, v4);
        }

        public static (T1, T2, T3, T4, T5) ReadValue<T1, T2, T3, T4, T5>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
            var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
            var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
            return (v1, v2, v3, v4, v5);
        }

        public static (T1, T2, T3, T4, T5, T6) ReadValue<T1, T2, T3, T4, T5, T6>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
            var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
            var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
            var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6));
            return (v1, v2, v3, v4, v5, v6);
        }

        public static (T1, T2, T3, T4, T5, T6, T7) ReadValue<T1, T2, T3, T4, T5, T6, T7>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
            var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
            var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
            var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6));
            var v7 = (T7)Convert.ChangeType(inputs[6], typeof(T7));
            return (v1, v2, v3, v4, v5, v6, v7);
        }

        public static (T1, T2, T3, T4, T5, T6, T7, T8) ReadValue<T1, T2, T3, T4, T5, T6, T7, T8>(this TextReader reader, char separator = ' ')
        {
            var inputs = ReadStringArray(reader, separator);
            var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
            var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
            var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
            var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
            var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
            var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6));
            var v7 = (T7)Convert.ChangeType(inputs[6], typeof(T7));
            var v8 = (T8)Convert.ChangeType(inputs[7], typeof(T8));
            return (v1, v2, v3, v4, v5, v6, v7, v8);
        }
    }
}

#endregion
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