結果
| 問題 |
No.1473 おでぶなおばけさん
|
| コンテスト | |
| ユーザー |
tenten
|
| 提出日時 | 2024-07-29 11:28:05 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 830 ms / 2,000 ms |
| コード長 | 3,830 bytes |
| コンパイル時間 | 3,300 ms |
| コンパイル使用メモリ | 89,716 KB |
| 実行使用メモリ | 66,700 KB |
| 最終ジャッジ日時 | 2024-07-29 11:28:39 |
| 合計ジャッジ時間 | 32,731 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 47 |
ソースコード
import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;
public class Main {
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner();
int n = sc.nextInt();
int m = sc.nextInt();
Road[] roads = new Road[m];
for (int i = 0; i < m; i++) {
roads[i] = new Road(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());
}
Arrays.sort(roads);
UnionFindTree uft = new UnionFindTree(n);
int ans = 0;
for (int i = m - 1; i >= 0; i--) {
uft.unite(roads[i]);
if (uft.same(0, n - 1)) {
ans = roads[i].value;
break;
}
}
List<List<Integer>> graph = new ArrayList<>();
for (int i = 0; i < n; i++) {
graph.add(new ArrayList<>());
}
for (int i = 0; i < m; i++) {
if (roads[i].value >= ans) {
graph.get(roads[i].left).add(roads[i].right);
graph.get(roads[i].right).add(roads[i].left);
}
}
Deque<Path> deq = new ArrayDeque<>();
deq.add(new Path(0, 0));
int[] costs = new int[n];
Arrays.fill(costs, Integer.MAX_VALUE);
while (deq.size() > 0) {
Path p = deq.poll();
if (costs[p.idx] <= p.value) {
continue;
}
costs[p.idx] = p.value;
for (int x : graph.get(p.idx)) {
deq.add(new Path(x, p.value + 1));
}
}
System.out.println(ans + " " + costs[n - 1]);
}
static class UnionFindTree {
int[] parents;
public UnionFindTree(int size) {
parents = IntStream.range(0, size).toArray();
}
public int find(int x) {
return x == parents[x] ? x : (parents[x] = find(parents[x]));
}
public boolean same(int x, int y) {
return find(x) == find(y);
}
public boolean same(Road r) {
return same(r.left, r.right);
}
public void unite(int x, int y) {
if (!same(x, y)) {
parents[find(x)] = find(y);
}
}
public void unite(Road r) {
unite(r.left, r.right);
}
}
static class Road implements Comparable<Road> {
int left;
int right;
int value;
public Road(int left, int right, int value) {
this.left = left;
this.right = right;
this.value = value;
}
public int compareTo(Road another) {
return value - another.value;
}
}
static class Path {
int idx;
int value;
public Path(int idx, int value) {
this.idx = idx;
this.value = value;
}
}
}
class Scanner {
BufferedReader br;
StringTokenizer st = new StringTokenizer("");
StringBuilder sb = new StringBuilder();
public Scanner() {
try {
br = new BufferedReader(new InputStreamReader(System.in));
} catch (Exception e) {
}
}
public int nextInt() {
return Integer.parseInt(next());
}
public long nextLong() {
return Long.parseLong(next());
}
public double nextDouble() {
return Double.parseDouble(next());
}
public String next() {
try {
while (!st.hasMoreTokens()) {
st = new StringTokenizer(br.readLine());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
return st.nextToken();
}
}
}
tenten