結果

問題 No.921 ずんだアロー
ユーザー 紙ぺーぱー紙ぺーぱー
提出日時 2019-11-08 21:26:09
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 62 ms / 2,000 ms
コード長 3,938 bytes
コンパイル時間 1,139 ms
コンパイル使用メモリ 111,488 KB
実行使用メモリ 23,496 KB
最終ジャッジ日時 2024-09-15 01:11:25
合計ジャッジ時間 3,084 ms
ジャッジサーバーID
(参考情報)
judge1 / judge2
このコードへのチャレンジ
(要ログイン)

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 25 ms
19,456 KB
testcase_01 AC 25 ms
19,712 KB
testcase_02 AC 26 ms
19,200 KB
testcase_03 AC 25 ms
19,328 KB
testcase_04 AC 26 ms
19,328 KB
testcase_05 AC 25 ms
19,456 KB
testcase_06 AC 25 ms
19,456 KB
testcase_07 AC 26 ms
19,584 KB
testcase_08 AC 26 ms
19,328 KB
testcase_09 AC 25 ms
19,200 KB
testcase_10 AC 58 ms
23,356 KB
testcase_11 AC 58 ms
23,496 KB
testcase_12 AC 34 ms
23,296 KB
testcase_13 AC 51 ms
23,228 KB
testcase_14 AC 55 ms
23,360 KB
testcase_15 AC 45 ms
23,364 KB
testcase_16 AC 29 ms
20,480 KB
testcase_17 AC 55 ms
23,232 KB
testcase_18 AC 61 ms
23,488 KB
testcase_19 AC 60 ms
23,364 KB
testcase_20 AC 62 ms
23,244 KB
testcase_21 AC 61 ms
23,380 KB
testcase_22 AC 62 ms
23,360 KB
testcase_23 AC 60 ms
23,360 KB
testcase_24 AC 60 ms
23,232 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 #

//author: camypaper
using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using Debug = System.Diagnostics.Debug;
using SB = System.Text.StringBuilder;
using System.Numerics;
using Point = System.Numerics.Complex;
using static System.Math;
using Number = System.Int32;
using System.Runtime.CompilerServices;

namespace Program {
    public class Solver {
        Random rnd = new Random(0);
        public void Solve() {
            var n = ri;
            var a = Enumerate(n, x => ri);
            var dp = new int[2];
            dp[1] = -100000000;
            var prev = -1;
            foreach (var x in a) {
                var next = new int[2];
                next[0] = Max(dp[0], dp[1]);
                next[1] = dp[0] + 1;
                if (x == prev) next[1] = Max(next[1], dp[1] + 1);
                dp = next;
                prev = x;
            }
            Console.WriteLine(dp.Max()); ;
        }
        const long INF = 1L << 60;
        int ri => sc.Integer();
        long rl => sc.Long();
        double rd => sc.Double();
        string rs => sc.Scan();
        public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());

        static IEnumerable<int> Rep(int n) => Enumerable.Range(0, n);
        static IEnumerable<int> RRep(int n) => Enumerable.Range(0, n).Reverse();
        static T[] Enumerate<T>(int n, Func<int, T> f) {
            var a = new T[n];
            for (int i = 0; i < a.Length; ++i) a[i] = f(i);
            return a;
        }
        static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
    }
}

#region main
static class Ex {
    static public string AsString(this IEnumerable<char> ie) { return new string(ie.ToArray()); }
    static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") {
        return string.Join(st, ie);
    }
    static public void Main() {
        Console.SetOut(new Program.IO.Printer(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Program.Solver();
        solver.Solve();
        Console.Out.Flush();
    }
}
#endregion
#region Ex
namespace Program.IO {
    using System.IO;
    using System.Text;
    using System.Globalization;

    public class Printer : StreamWriter {
        public override IFormatProvider FormatProvider => CultureInfo.InvariantCulture;
        public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
    }

    public class StreamScanner {
        public StreamScanner(Stream stream) { str = stream; }

        public readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;

        private byte read() {
            if (isEof) return 0;
            if (ptr >= len) {
                ptr = 0;
                if ((len = str.Read(buf, 0, 1024)) <= 0) {
                    isEof = true;
                    return 0;
                }
            }
            return buf[ptr++];
        }

        public char Char() {
            byte b = 0;
            do b = read(); while ((b < 33 || 126 < b) && !isEof);
            return (char)b;
        }
        public string Scan() {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b);
            return sb.ToString();
        }
        public string ScanLine() {
            var sb = new StringBuilder();
            for (var b = Char(); b != '\n' && b != 0; b = (char)read()) if (b != '\r') sb.Append(b);
            return sb.ToString();
        }
        public long Long() { return isEof ? long.MinValue : long.Parse(Scan()); }
        public int Integer() { return isEof ? int.MinValue : int.Parse(Scan()); }
        public double Double() { return isEof ? double.NaN : double.Parse(Scan(), CultureInfo.InvariantCulture); }
    }
}

#endregion
0