結果

問題 No.209 Longest Mountain Subsequence
ユーザー EmKjpEmKjp
提出日時 2015-05-15 23:09:55
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 214 ms / 2,000 ms
コード長 4,592 bytes
コンパイル時間 2,274 ms
コンパイル使用メモリ 108,612 KB
実行使用メモリ 43,648 KB
最終ジャッジ日時 2023-09-20 08:29:40
合計ジャッジ時間 3,821 ms
ジャッジサーバーID
(参考情報)
judge13 / 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 122 ms
41,620 KB
testcase_01 AC 116 ms
39,696 KB
testcase_02 AC 113 ms
41,624 KB
testcase_03 AC 213 ms
39,676 KB
testcase_04 AC 214 ms
43,648 KB
testcase_05 AC 86 ms
39,800 KB
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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.Globalization;
using System.Linq;
using System.Text;

partial class Solver {
    int?[,] memo1 = new int?[111, 111];
    int dfs1(int[] A, int pos, int pre) {
        if (!memo1[pos, pre].HasValue) {
            int d = Math.Abs(A[pre] - A[pos]);
            int maxLeftLength = 0;
            for (int i = 0; i < pos; i++) {
                if (A[i] < A[pos] && Math.Abs(A[pos] - A[i]) < d) {
                    maxLeftLength = Math.Max(maxLeftLength, dfs1(A, i, pos));
                }
            }
            memo1[pos, pre] = maxLeftLength + 1;
        }
        return memo1[pos, pre].Value;
    }

    int?[,] memo2 = new int?[111, 111];
    int dfs2(int[] A, int pos, int pre) {
        if (!memo2[pos, pre].HasValue) {
            int d = Math.Abs(A[pos] - A[pre]);
            int maxRightLength = 0;
            for (int i = pos + 1; i < A.Length; i++) {
                if (A[i] < A[pos] && Math.Abs(A[pos] - A[i]) < d) {
                    maxRightLength = Math.Max(maxRightLength, dfs2(A, i, pos));
                }
            }
            memo2[pos, pre] = maxRightLength + 1;
        }
        return memo2[pos, pre].Value;
    }

    public void Run() {
        var t = ni();
        while (t-- > 0) {
            var n = ni();
            var A = ni(n);
            int ans = 0;

            this.memo1 = new int?[111, 111];
            this.memo2 = new int?[111, 111];

            for (int i = 0; i < n; i++) {
                int maxLeftLength = 0;
                int maxRightLength = 0;
                for (int j = 0; j < i; j++) {
                    if (A[j] < A[i]) {
                        maxLeftLength = Math.Max(maxLeftLength, dfs1(A, j, i));
                    }
                }
                for (int j = i + 1; j < n; j++) {
                    if (A[j] < A[i]) {
                        maxRightLength = Math.Max(maxRightLength, dfs2(A, j, i));
                    }
                }
                ans = Math.Max(maxLeftLength + maxRightLength + 1, ans);
            }

            cout.WriteLine(ans);
        }
    }
}

// PREWRITEN CODE BEGINS FROM HERE
partial class Solver : Scanner {
    public static void Main(string[] args) {
        new Solver(Console.In, Console.Out).Run();
    }

    TextReader cin;
    TextWriter cout;

    public Solver(TextReader reader, TextWriter writer)
        : base(reader) {
        this.cin = reader;
        this.cout = writer;
    }
    public Solver(string input, TextWriter writer)
        : this(new StringReader(input), writer) {
    }

    public int ni() { return NextInt(); }
    public int[] ni(int n) { return NextIntArray(n); }
    public long nl() { return NextLong(); }
    public long[] nl(int n) { return NextLongArray(n); }
    public string ns() { return Next(); }
}

public class Scanner {
    private TextReader Reader;
    private Queue<String> TokenQueue = new Queue<string>();
    private CultureInfo ci = CultureInfo.InvariantCulture;

    public Scanner()
        : this(Console.In) {
    }

    public Scanner(TextReader reader) {
        this.Reader = reader;
    }

    public int NextInt() { return Int32.Parse(Next(), ci); }
    public long NextLong() { return Int64.Parse(Next(), ci); }
    public double NextDouble() { return double.Parse(Next(), ci); }
    public string[] NextArray(int size) {
        var array = new string[size];
        for (int i = 0; i < size; i++) array[i] = Next();
        return array;
    }
    public int[] NextIntArray(int size) {
        var array = new int[size];
        for (int i = 0; i < size; i++) array[i] = NextInt();
        return array;
    }

    public long[] NextLongArray(int size) {
        var array = new long[size];
        for (int i = 0; i < size; i++) array[i] = NextLong();
        return array;
    }

    public String Next() {
        if (TokenQueue.Count == 0) {
            if (!StockTokens()) throw new InvalidOperationException();
        }
        return TokenQueue.Dequeue();
    }

    public bool HasNext() {
        if (TokenQueue.Count > 0)
            return true;
        return StockTokens();
    }

    private bool StockTokens() {
        while (true) {
            var line = Reader.ReadLine();
            if (line == null) return false;
            var tokens = line.Trim().Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            if (tokens.Length == 0) continue;
            foreach (var token in tokens)
                TokenQueue.Enqueue(token);
            return true;
        }
    }
}
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