結果
| 問題 | No.20 砂漠のオアシス |
| ユーザー |
 sekiya9311
|
| 提出日時 | 2017-10-14 22:42:18 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 96 ms / 5,000 ms |
| コード長 | 11,821 bytes |
| コンパイル時間 | 1,150 ms |
| コンパイル使用メモリ | 116,664 KB |
| 実行使用メモリ | 24,960 KB |
| 最終ジャッジ日時 | 2024-11-17 14:52:52 |
| 合計ジャッジ時間 | 2,998 ms |
|
ジャッジサーバーID （参考情報） |
judge1 / judge2 |
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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 | 27 ms
18,304 KB |
| testcase_01 | AC | 26 ms
18,304 KB |
| testcase_02 | AC | 29 ms
17,920 KB |
| testcase_03 | AC | 32 ms
18,560 KB |
| testcase_04 | AC | 32 ms
18,688 KB |
| testcase_05 | AC | 89 ms
24,960 KB |
| testcase_06 | AC | 95 ms
24,064 KB |
| testcase_07 | AC | 96 ms
24,192 KB |
| testcase_08 | AC | 86 ms
24,192 KB |
| testcase_09 | AC | 93 ms
24,064 KB |
| testcase_10 | AC | 27 ms
18,176 KB |
| testcase_11 | AC | 27 ms
18,176 KB |
| testcase_12 | AC | 29 ms
18,944 KB |
| testcase_13 | AC | 30 ms
19,200 KB |
| testcase_14 | AC | 35 ms
19,712 KB |
| testcase_15 | AC | 32 ms
19,200 KB |
| testcase_16 | AC | 42 ms
21,736 KB |
| testcase_17 | AC | 39 ms
20,604 KB |
| testcase_18 | AC | 41 ms
21,376 KB |
| testcase_19 | AC | 43 ms
21,760 KB |
| testcase_20 | AC | 29 ms
18,688 KB |
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
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 { x = sc.NextInt - 1, y = 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);
//wr.WriteLine("{0} {1} {2}", f, ff, V);
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(st));
int[,] u = new int[N, N];
for (int i = 0; i < N; i++)
{
for (int j = 0; j < N; j++)
{
u[i, j] = (int)1e9;
}
}
u[st.y, st.x] = 0;
int preCost = 0;
while (!heap.IsEmpty())
{
var state = heap.Poll();
if (preCost > state.Cost) throw new Exception();
preCost = state.Cost;
if (state.p.Equals(ed))
{
return state.Cost;
}
var nextPoint = state.p.Next();
foreach (var p in nextPoint)
{
if (Inside(p))
{
int nextCost = state.Cost + L[p.y, p.x];
if (nextCost < u[p.y, p.x])
{
u[p.y, p.x] = 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));
}
if (ret.Count != 4) throw new Exception();
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;
}
}
}
}