結果

問題 No.20 砂漠のオアシス
ユーザー ぴろずぴろず
提出日時 2015-02-15 13:54:22
言語 Java21
(openjdk 21)
結果
AC  
実行時間 213 ms / 5,000 ms
コード長 6,045 bytes
コンパイル時間 2,385 ms
コンパイル使用メモリ 80,132 KB
実行使用メモリ 53,072 KB
最終ジャッジ日時 2024-04-21 06:23:15
合計ジャッジ時間 5,266 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
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 48 ms
37,272 KB
testcase_01 AC 48 ms
36,960 KB
testcase_02 AC 49 ms
37,088 KB
testcase_03 AC 72 ms
38,428 KB
testcase_04 AC 82 ms
38,916 KB
testcase_05 AC 191 ms
50,584 KB
testcase_06 AC 213 ms
53,072 KB
testcase_07 AC 208 ms
52,628 KB
testcase_08 AC 202 ms
52,576 KB
testcase_09 AC 200 ms
52,320 KB
testcase_10 AC 48 ms
37,136 KB
testcase_11 AC 49 ms
37,156 KB
testcase_12 AC 77 ms
38,076 KB
testcase_13 AC 75 ms
38,400 KB
testcase_14 AC 84 ms
39,548 KB
testcase_15 AC 82 ms
39,160 KB
testcase_16 AC 114 ms
41,396 KB
testcase_17 AC 99 ms
39,996 KB
testcase_18 AC 110 ms
41,116 KB
testcase_19 AC 113 ms
41,128 KB
testcase_20 AC 58 ms
37,352 KB
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ソースコード

diff # 

package no20a;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.util.PriorityQueue;

public class Main {
	static IO io = new IO();
	static int[] di = {1,0,-1,0};
	static int[] dj = {0,1,0,-1};
	public static void main(String[] args) {
		int n = io.nextInt();
		int v = io.nextInt();
		int ox = io.nextInt() - 1;
		int oy = io.nextInt() - 1;
		int[][] level = io.matrixInt(n, n);
		Graph g = new Graph(n*n);
		for(int i=0;i<n;i++) {
			for(int j=0;j<n;j++) {
				for(int k=0;k<4;k++) {
					int ni = i + di[k];
					int nj = j + dj[k];
					if (ni < 0 || ni >= n || nj < 0 || nj >= n) {
						continue;
					}
					g.addEdge(i*n+j, ni*n+nj, level[ni][nj]);
				}
			}
		}
		int[] dist = g.minDistDijkstra(0);
		int so = ox == -1 ? 1000 : dist[oy*n+ox];
		int sg = dist[n*n-1];
		int og = ox == -1 ? 1000 : g.minDistDijkstra(oy*n+ox)[n*n-1];
		if (sg < v || (so < v && og < (v-so)*2)) {
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}

}
class Graph {
	public static final int INF = 1<<29;
	int n;
	ArrayList<Edge>[] graph;

	@SuppressWarnings("unchecked")
	public Graph(int n) {
		this.n = n;
		this.graph = new ArrayList[n];
		for(int i=0;i<n;i++) {
			graph[i] = new ArrayList<Edge>();
		}
	}

	public void addBidirectionalEdge(int from,int to,int cost) {
		addEdge(from,to,cost);
		addEdge(to,from,cost);
	}
	public void addEdge(int from,int to,int cost) {
		graph[from].add(new Edge(to, cost));
	}

	//dijkstra O(ElogV)
	public int[] minDistDijkstra(int s) {
		int[] dist = new int[n];
		Arrays.fill(dist, INF);
		dist[s] = 0;
		PriorityQueue<Node> q = new PriorityQueue<Node>();
		q.offer(new Node(0, s));
		while(!q.isEmpty()) {
			Node node = q.poll();
			int v = node.id;
			if (dist[v] < node.dist) {
				continue;
			}
			for(Edge e:graph[v]) {
				if (dist[e.to] > dist[v] + e.cost) {
					dist[e.to] = dist[v] + e.cost;
					q.add(new Node(dist[e.to], e.to));
				}
			}
		}
		return dist;
	}

	class Edge {
		int to;
		int cost;
		public Edge(int to,int cost) {
			this.to = to;
			this.cost = cost;
		}
	}
	class Node implements Comparable<Node>{
		int dist;
		int id;
		public Node(int dist,int i) {
			this.dist = dist;
			this.id = i;
		}
		public int compareTo(Node o) {
			return (this.dist < o.dist) ? -1 : ((this.dist == o.dist) ? 0 : 1);
		}
	}
}

class IO extends PrintWriter {
	private final InputStream in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	public IO() { this(System.in);}
	public IO(InputStream source) { super(System.out); this.in = source;}
	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		}else{
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}
	private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
	private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
	private static boolean isNewLine(int c) { return c == '\n' || c == '\r';}
	private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
	private void skipNewLine() { while(hasNextByte() && isNewLine(buffer[ptr])) ptr++;}
	public boolean hasNext() { skipUnprintable(); return hasNextByte();}
	public boolean hasNextLine() { skipNewLine(); return hasNextByte();}
	public String next() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public char[] nextCharArray(int len) {
		char[] s = new char[len];
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		int i = 0;
		int b = readByte();
		while(isPrintableChar(b)) {
			if (i == len) {
				throw new InputMismatchException();
			}
			s[i++] = (char) b;
			b = readByte();
		}
		return s;
	}
	public String nextLine() {
		if (!hasNextLine()) {
			throw new NoSuchElementException();
		}
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(!isNewLine(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public long nextLong() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while(true){
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			}else if(b == -1 || !isPrintableChar(b)){
				return minus ? -n : n;
			}else{
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}
	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
			throw new NumberFormatException();
		}
		return (int) nl;
	}
	public char nextChar() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		return (char) readByte();
	}
	public double nextDouble() { return Double.parseDouble(next());}
	public int[] arrayInt(int n) { int[] a = new int[n]; for(int i=0;i<n;i++) a[i] = nextInt(); return a;}
	public long[] arrayLong(int n) { long[] a = new long[n]; for(int i=0;i<n;i++) a[i] = nextLong(); return a;}
	public double[] arrayDouble(int n) { double[] a = new double[n]; for(int i=0;i<n;i++) a[i] = nextDouble(); return a;}
	public void arrayInt(int[]... a) {for(int i=0;i<a[0].length;i++) for(int j=0;j<a.length;j++) a[j][i] = nextInt();}
	public int[][] matrixInt(int n,int m) { int[][] a = new int[n][m]; for(int i=0;i<n;i++) a[i] = arrayInt(m); return a;}
	public char[][] charMap(int n,int m) { char[][] a = new char[n][m]; for(int i=0;i<n;i++) a[i] = nextCharArray(m); return a;}
	public void close() {
		super.close();
		try {
			in.close();
		} catch (IOException e) {}
	}
}
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