結果

問題 No.20 砂漠のオアシス
ユーザー sekiya9311sekiya9311
提出日時 2017-10-14 22:05:04
言語 C#(csc)
(csc 3.9.0)
結果
WA  
実行時間 -
コード長 11,413 bytes
コンパイル時間 987 ms
コンパイル使用メモリ 112,000 KB
実行使用メモリ 23,808 KB
最終ジャッジ日時 2024-11-17 14:52:40
合計ジャッジ時間 2,658 ms
ジャッジサーバーID
(参考情報)
judge2 / judge4
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 28 ms
18,048 KB
testcase_01 WA -
testcase_02 AC 28 ms
18,304 KB
testcase_03 AC 29 ms
18,816 KB
testcase_04 AC 31 ms
18,560 KB
testcase_05 AC 73 ms
22,784 KB
testcase_06 AC 93 ms
23,680 KB
testcase_07 WA -
testcase_08 AC 83 ms
23,552 KB
testcase_09 AC 101 ms
23,808 KB
testcase_10 AC 27 ms
18,048 KB
testcase_11 WA -
testcase_12 AC 31 ms
18,688 KB
testcase_13 AC 32 ms
19,072 KB
testcase_14 WA -
testcase_15 WA -
testcase_16 WA -
testcase_17 AC 39 ms
20,480 KB
testcase_18 WA -
testcase_19 AC 43 ms
22,144 KB
testcase_20 WA -
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.Text;

namespace ProgrammingContest
{
    class MainClass : IDisposable
    {
        Scanner sc;
        Writer wr;
        string backPath = "..";
        char dirSep = System.IO.Path.DirectorySeparatorChar;
        string inFilePath = null;
        string outFilePath = null;
        public MainClass()
        {
            this.inFilePath = this.backPath
                            + this.dirSep
                            + this.backPath
                            + this.dirSep
                            + "in.txt";
            this.outFilePath = this.backPath
                             + this.dirSep
                             + this.backPath
                             + this.dirSep
                             + "out.txt";
        }
        static void Main(string[] args)
        {
            using (var mainClass = new MainClass())
            {
                //mainClass.MakeTestCase();
                mainClass.Solve();
            }
        }

        public void Dispose()
        {
            if (this.sc != null)
            {
                this.sc.Dispose();
                this.sc = null;
            }
            if (this.wr != null)
            {
                this.wr.Dispose();
                this.wr = null;
            }
        }

        void MakeTestCase()
        {
            Random rand = new Random();
            var res = new StringBuilder();



            using (var writer = new System.IO.StreamWriter(inFilePath))
                writer.Write(res.ToString());
        }

        void Solve()
        {
            this.wr = new Writer(this.isReactive);
            //this.wr = new Writer(this.outFilePath);
#if DEBUG
            if (!this.isReactive)
                this.sc = new Scanner(this.inFilePath);
            else
                this.sc = new Scanner();
#else
            this.sc = new Scanner();
#endif

            N = sc.NextInt;
            V = sc.NextInt;
            oasis = new Point { y = sc.NextInt - 1, x = sc.NextInt - 1 };
            L = new int[N, N];
            for (int i = 0; i < N; i++)
            {
                for (int j = 0; j < N; j++)
                {
                    L[i, j] = sc.NextInt;
                }
            }
            var st = new Point() { x = 0, y = 0 };
            var ed = new Point() { x = N - 1, y = N - 1 };
            string ans = "NO";
            if (Dijkstra(st, ed) < V)
            {
                ans = "YES";
            }
            else if (!oasis.Equals(new Point() { x = -1, y = -1 }))
            {
                int f = Dijkstra(st, oasis);
                if (f < V)
                {
                    int ff = Dijkstra(oasis, ed);
                    if (ff < (V - f) * 2)
                    {
                        ans = "YES";
                    }
                }
            }
            wr.WriteLine(ans);
        }

        int Dijkstra(Point st, Point ed)
        {
            var heap = new SkewHeap<State>();
            heap.Push(new State());
            bool[,] u = new bool[N, N];
            u[st.y, st.x] = true;
            while (!heap.IsEmpty())
            {
                var state = heap.Poll();
                var nextPoint = state.p.Next();
                foreach (var p in nextPoint)
                {
                    if (Inside(p))
                    {
                        if (!u[p.y, p.x])
                        {
                            int nextCost = state.Cost + L[p.y, p.x];
                            u[p.y, p.x] = true;
                            if (p.Equals(ed))
                            {
                                return nextCost;
                            }
                            heap.Push(new State(p, nextCost));
                        }
                    }
                }
            }
            return -1;
        }

        int N, V;
        Point oasis;
        int[,] L;
        bool Inside(Point p)
        {
            return 0 <= p.x && p.x < N && 0 <= p.y && p.y < N;
        }

        struct State : IComparable<State>
        {
            public Point p;
            public int Cost;
            public State(int nx, int ny)
            {
                p = new Point { x = nx, y = ny };
                Cost = 0;
            }
            public State(Point p, int cost = 0)
            {
                this.p = p;
                this.Cost = cost;
            }
            public int CompareTo(State other)
            {
                return Math.Sign(this.Cost - other.Cost);
            }
        }

        struct Point
        {
            public int x, y;
            static Point[] dPoint = new Point[]
            {
                new Point{ x = 0, y = -1},
                new Point{ x = -1, y = 0},
                new Point{ x = 0, y = 1},
                new Point{ x = 1, y = 0},
            };
            private Point Next(Point d)
            {
                return new Point { x = this.x + d.x, y = this.y + d.y };
            }
            public List<Point> Next()
            {
                List<Point> ret = new List<Point>();
                foreach (var el in dPoint)
                {
                    ret.Add(this.Next(el));
                }
                return ret;
            }
            public override bool Equals(object other)
            {
                return (other is Point)
                    && ((Point)other).x == this.x
                    && ((Point)other).y == this.y;
            }
        }


        bool isReactive = false; // TODO: reactive check !!
    }

    class SkewHeap<T> where T : IComparable<T>
    {
        private class HeapNode
        {
            public HeapNode l, r;
            public T val;
            public static Func<T, T, int> CompareTo;

            public HeapNode(T val)
            {
                this.val = val;
                l = r = null;
            }
            public static HeapNode Meld(HeapNode leftNode, HeapNode rightNode)
            {
                if (leftNode == null)
                {
                    return rightNode;
                }
                if (rightNode == null)
                {
                    return leftNode;
                }
                if (HeapNode.CompareTo(leftNode.val, rightNode.val) > 0)
                {
                    var t = rightNode;
                    rightNode = leftNode;
                    leftNode = t;
                }
                leftNode.r = Meld(leftNode.r, rightNode);
                var t2 = leftNode.l;
                leftNode.l = leftNode.r;
                leftNode.r = t2;
                return leftNode;
            }
        }
        private HeapNode topNode;
        private int count_;

        public int Count { get { return this.count_; } }

        public SkewHeap(Func<T, T, int> comp = null)
        {
            HeapNode.CompareTo = (comp ?? ((T l, T r) => l.CompareTo(r)));
            this.topNode = null;
            this.count_ = 0;
        }
        public void Pop()
        {
            this.topNode = HeapNode.Meld(this.topNode.l, this.topNode.r);
            this.count_--;
        }
        public T Top()
        {
            return this.topNode.val;
        }
        public void Push(T val)
        {
            this.topNode = HeapNode.Meld(this.topNode, new HeapNode(val));
            this.count_++;
        }
        public T Poll()
        {
            T retVal = this.Top();
            this.Pop();
            return retVal;
        }
        public bool IsEmpty()
        {
            return this.topNode == null;
        }
        public void Merge(SkewHeap<T> otherHeap)
        {
            this.count_ += otherHeap.Count;
            this.topNode = HeapNode.Meld(this.topNode, otherHeap.topNode);
        }
    }


    class Writer : IDisposable
    {
        System.IO.TextWriter writer;
        StringBuilder sb;
        bool isReactive;
        public Writer(string path) : this(new System.IO.StreamWriter(path))
        {
        }
        public Writer(bool isReactive) : this(null, isReactive)
        {
        }
        public Writer(System.IO.TextWriter writer = null, bool isReactive = false)
        {
            this.writer = (writer ?? Console.Out);
            if (!(this.isReactive = isReactive))
            {
                this.sb = new StringBuilder();
            }
        }
        public void Dispose()
        {
            if (!isReactive)
                this.writer.Write(sb.ToString());
            if (!this.writer.Equals(Console.Out))
                this.writer.Dispose();
        }
        public void Write(object val)
        {
            if (this.isReactive)
            {
                this.writer.Write(val.ToString());
                this.writer.Flush();
            }
            else
                this.sb.Append(val.ToString());
        }
        public void Write(string format, params object[] vals)
        {
            if (this.isReactive)
            {
                this.writer.Write(format, vals);
                this.writer.Flush();
            }
            else
                this.sb.AppendFormat(format, vals);
        }
        public void WriteLine(object val)
        {
            this.Write(val.ToString() + System.Environment.NewLine);
        }
        public void WriteLine(string format, params object[] vals)
        {
            this.Write(format + System.Environment.NewLine, vals);
        }
    }

    class Scanner : IDisposable
    {
        Queue<string> buffer;
        char[] sep;
        System.IO.TextReader reader;
        public Scanner(string path) : this(new System.IO.StreamReader(path))
        {
        }
        public Scanner(System.IO.TextReader reader = null)
        {
            this.buffer = new Queue<string>();
            this.sep = new char[] { ' ' };
            this.reader = (reader ?? Console.In);
        }
        private void CheckBuffer()
        {
            if (this.buffer.Count == 0)
            {
                string str = null;
                while (string.IsNullOrEmpty(str))
                {
                    str = this.reader.ReadLine();
                }
                string[] sreArray = str.Split(this.sep);
                foreach (string elStr in sreArray)
                {
                    this.buffer.Enqueue(elStr);
                }
            }
        }

        public void Dispose()
        {
            if (!this.reader.Equals(Console.In))
                this.reader.Dispose();
        }

        public string Next
        {
            get
            {
                this.CheckBuffer();
                return this.buffer.Dequeue();
            }
        }

        public int NextInt
        {
            get
            {
                return int.Parse(this.Next);
            }
        }
        public double NextDouble
        {
            get
            {
                return double.Parse(this.Next);
            }
        }

        public long NextLong
        {
            get
            {
                return long.Parse(this.Next);
            }
        }
        public bool IsEmpty
        {
            get
            {
                this.CheckBuffer();
                return this.buffer.Count == 0;
            }
        }
    }
}
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