結果
| 問題 |
No.1283 Extra Fee
|
| コンテスト | |
| ユーザー |
 ywmt
|
| 提出日時 | 2020-11-06 22:32:03 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 1,484 ms / 2,000 ms |
| コード長 | 6,646 bytes |
| コンパイル時間 | 2,451 ms |
| コンパイル使用メモリ | 82,796 KB |
| 実行使用メモリ | 256,244 KB |
| 最終ジャッジ日時 | 2024-11-16 06:44:11 |
| 合計ジャッジ時間 | 24,347 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 30 |
ソースコード
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.util.PriorityQueue;
public class Main {
static PrintWriter out;
static InputReader ir;
static final int[] dx = { 0, 1, 0, -1 };
static final int[] dy = { 1, 0, -1, 0 };
static void solve() {
int n = ir.nextInt();
int m = ir.nextInt();
HashMap<Long, Long> mp = new HashMap<>();
for (int i = 0; i < m; i++) {
int h = ir.nextInt() - 1;
int w = ir.nextInt() - 1;
long c = ir.nextLong();
mp.put((long) h << 10 | w, c);
}
Graph[] g = new Graph[n * n * 2];
for (int i = 0; i < n * n * 2; i++)
g[i] = new Graph();
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
for (int k = 0; k < 4; k++) {
int nx = i + dx[k];
int ny = j + dy[k];
if (nx < 0 || ny < 0 || nx >= n || ny >= n)
continue;
long cost = 1;
if (mp.containsKey((long) nx << 10 | ny)) {
cost += mp.get((long) nx << 10 | ny);
}
g[i * n + j].add(new long[] { nx * n + ny, cost });
g[n * n + i * n + j].add(new long[] { n * n + nx * n + ny, cost });
if (cost > 1) {
g[i * n + j].add(new long[] { n * n + nx * n + ny, 1 });
}
}
}
}
long[] d = dijkstra(0, g);
out.println(Math.min(d[n * n - 1], d[n * n * 2 - 1]));
}
public static long[] dijkstra(int s, Graph[] g) {
long[] d = new long[g.length];
PriorityQueue<long[]> pq = new PriorityQueue<long[]>(new Comparator<long[]>() {
public int compare(long[] a, long[] b) {
return Long.compare(a[1], b[1]);
}
});
Arrays.fill(d, 1L << 60);
d[s] = 0;
pq.offer(new long[] { s, 0 });
while (!pq.isEmpty()) {
long[] p = pq.poll();
int from = (int) p[0];
if (d[from] != p[1])
continue;
for (int i = 0; i < g[from].size(); i++) {
long[] e = g[from].get(i);
int to = (int) e[0];
if (d[to] > d[from] + e[1]) {
d[to] = d[from] + e[1];
pq.offer(new long[] { to, d[to] });
}
}
}
return d;
}
static class Graph extends ArrayList<long[]> {
}
public static void main(String[] args) {
ir = new InputReader(System.in);
out = new PrintWriter(System.out);
solve();
out.flush();
}
static class InputReader {
private InputStream in;
private byte[] buffer = new byte[1024];
private int curbuf;
private int lenbuf;
public InputReader(InputStream in) {
this.in = in;
this.curbuf = this.lenbuf = 0;
}
public boolean hasNextByte() {
if (curbuf >= lenbuf) {
curbuf = 0;
try {
lenbuf = in.read(buffer);
} catch (IOException e) {
throw new InputMismatchException();
}
if (lenbuf <= 0)
return false;
}
return true;
}
private int readByte() {
if (hasNextByte())
return buffer[curbuf++];
else
return -1;
}
private boolean isSpaceChar(int c) {
return !(c >= 33 && c <= 126);
}
private void skip() {
while (hasNextByte() && isSpaceChar(buffer[curbuf]))
curbuf++;
}
public boolean hasNext() {
skip();
return hasNextByte();
}
public String next() {
if (!hasNext())
throw new NoSuchElementException();
StringBuilder sb = new StringBuilder();
int b = readByte();
while (!isSpaceChar(b)) {
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
public int nextInt() {
if (!hasNext())
throw new NoSuchElementException();
int c = readByte();
while (isSpaceChar(c))
c = readByte();
boolean minus = false;
if (c == '-') {
minus = true;
c = readByte();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res = res * 10 + c - '0';
c = readByte();
} while (!isSpaceChar(c));
return (minus) ? -res : res;
}
public long nextLong() {
if (!hasNext())
throw new NoSuchElementException();
int c = readByte();
while (isSpaceChar(c))
c = readByte();
boolean minus = false;
if (c == '-') {
minus = true;
c = readByte();
}
long res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res = res * 10 + c - '0';
c = readByte();
} while (!isSpaceChar(c));
return (minus) ? -res : res;
}
public double nextDouble() {
return Double.parseDouble(next());
}
public int[] nextIntArray(int n) {
int[] a = new int[n];
for (int i = 0; i < n; i++)
a[i] = nextInt();
return a;
}
public long[] nextLongArray(int n) {
long[] a = new long[n];
for (int i = 0; i < n; i++)
a[i] = nextLong();
return a;
}
public char[][] nextCharMap(int n, int m) {
char[][] map = new char[n][m];
for (int i = 0; i < n; i++)
map[i] = next().toCharArray();
return map;
}
}
static void tr(Object... o) {
System.err.println(Arrays.deepToString(o));
}
}