結果
| 問題 |
No.20 砂漠のオアシス
|
| コンテスト | |
| ユーザー |
 ぴろず
|
| 提出日時 | 2015-02-15 13:54:22 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 208 ms / 5,000 ms |
| コード長 | 6,045 bytes |
| コンパイル時間 | 2,271 ms |
| コンパイル使用メモリ | 80,244 KB |
| 実行使用メモリ | 52,764 KB |
| 最終ジャッジ日時 | 2024-10-13 05:02:50 |
| 合計ジャッジ時間 | 5,256 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 21 |
ソースコード
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) {}
}
}