結果

問題 No.818 Dinner time
ユーザー claw88
提出日時 2019-04-19 22:20:42
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 129 ms / 2,000 ms
コード長 4,456 bytes
コンパイル時間 2,554 ms
コンパイル使用メモリ 114,916 KB
実行使用メモリ 28,160 KB
最終ジャッジ日時 2024-11-29 23:30:10
合計ジャッジ時間 5,894 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other AC * 29
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.Linq;
using System.IO;
using SB = System.Text.StringBuilder;
//using System.Threading.Tasks;
//using System.Text.RegularExpressions;
//using System.Globalization;
//using System.Diagnostics;
using static System.Console;
using System.Numerics;
using static System.Math;
using pair = Pair<int, int>;

class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().solve();
        Out.Flush();
    }
    readonly Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 }; //→↓←↑
    readonly int mod = 1000000007;
    readonly int dom = 998244353;
    bool chmax<T>(ref T a, T b) where T : IComparable<T> { if (a.CompareTo(b) < 0) { a = b; return true; } return false; }
    bool chmin<T>(ref T a, T b) where T : IComparable<T> { if (b.CompareTo(a) < 0) { a = b; return true; } return false; }

    long calc(int D, long A, long B)
    {
        if (D == 0) return 0;

        if (A >= 0)
        {
            return A * (D - 1) + Max(A, B);
        }
        else
        {
            return Max(A * D, B);
        }
    }
    void solve()
    {
        int N = cin.nextint;
        int M = cin.nextint;
        var A = new long[N];
        var B = new long[N];
        for (int i = 0; i < N; i++)
        {
            A[i] = cin.nextint;
            B[i] = cin.nextint;
        }

        var dp = new long[N + 1][]; //{0日利用、1日利用、M日利用}
        var day = new[] { 0, 1, M };

        for (int i = 0; i < dp.Length; i++)
        {
            dp[i] = new long[day.Length];
            for (int j = 0; j < dp[i].Length; j++)
            {
                dp[i][j] = int.MinValue;
            }
        }
        dp[N][0] = 0;

        for (int i = N - 1; i >= 0; i--)
        {
            for (int j = 0; j < day.Length; j++)
            {
                for (int k = j; k < day.Length; k++)
                {
                    var point = calc(day[k], A[i], B[i]);
                    chmax(ref dp[i][k], dp[i + 1][j] + point);
                }
            }
        }

        //dp[0].join();
        WriteLine(dp[0][2]);

    }

}


static class Ex
{
    public static void join<T>(this IEnumerable<T> values, string sep = " ") => WriteLine(string.Join(sep, values));
    public static string concat<T>(this IEnumerable<T> values) => string.Concat(values);
    public static string reverse(this string s) { var t = s.ToCharArray(); Array.Reverse(t); return t.concat(); }

    public static int lower_bound<T>(this IList<T> arr, T val) where T : IComparable<T>
    {
        int low = 0, high = arr.Count;
        int mid;
        while (low < high)
        {
            mid = ((high - low) >> 1) + low;
            if (arr[mid].CompareTo(val) < 0) low = mid + 1;
            else high = mid;
        }
        return low;
    }
    public static int upper_bound<T>(this IList<T> arr, T val) where T : IComparable<T>
    {
        int low = 0, high = arr.Count;
        int mid;
        while (low < high)
        {
            mid = ((high - low) >> 1) + low;
            if (arr[mid].CompareTo(val) <= 0) low = mid + 1;
            else high = mid;
        }
        return low;
    }
}

class Pair<T, U> : IComparable<Pair<T, U>> where T : IComparable<T> where U : IComparable<U>
{
    public T f; public U s;
    public Pair(T f, U s) { this.f = f; this.s = s; }
    public int CompareTo(Pair<T, U> a) => f.CompareTo(a.f) != 0 ? f.CompareTo(a.f) : s.CompareTo(a.s);
    public override string ToString() => $"{f} {s}";
}

class Scanner
{
    string[] s; int i;
    readonly char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] scan => ReadLine().Split();
    public int[] scanint => Array.ConvertAll(scan, int.Parse);
    public long[] scanlong => Array.ConvertAll(scan, long.Parse);
    public double[] scandouble => Array.ConvertAll(scan, double.Parse);
    public string next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return next;
        }
    }
    public int nextint => int.Parse(next);
    public long nextlong => long.Parse(next);
    public double nextdouble => double.Parse(next);
}
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