結果
問題 | No.1805 Approaching Many Typhoon |
ユーザー |
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提出日時 | 2022-01-21 16:33:30 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 95 ms / 2,000 ms |
コード長 | 2,432 bytes |
コンパイル時間 | 5,296 ms |
コンパイル使用メモリ | 78,476 KB |
実行使用メモリ | 51,624 KB |
最終ジャッジ日時 | 2024-11-25 13:37:16 |
合計ジャッジ時間 | 6,041 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 35 |
ソースコード
import java.io.*;import java.util.*;public class Main {public static void main(String[] args) throws Exception {Scanner sc = new Scanner();int n = sc.nextInt();int m = sc.nextInt();int start = sc.nextInt() - 1;int goal = sc.nextInt() - 1;int[] lefts = new int[m];int[] rights = new int[m];for (int i = 0; i < m; i++) {lefts[i] = sc.nextInt() - 1;rights[i] = sc.nextInt() - 1;}int u = sc.nextInt();HashSet<Integer> ngs = new HashSet<>();for (int i = 0; i < u; i++) {ngs.add(sc.nextInt() - 1);}UnionFindTree uft = new UnionFindTree(n);for (int i = 0; i < m; i++) {if (!ngs.contains(lefts[i]) && !ngs.contains(rights[i])) {uft.unite(lefts[i], rights[i]);}}if (uft.same(start, goal)) {System.out.println("Yes");} else {System.out.println("No");}}static class UnionFindTree {int[] parents;public UnionFindTree(int size) {parents = new int[size];for (int i = 0; i < size; i++) {parents[i] = i;}}public int find(int x) {if (x == parents[x]) {return x;} else {return parents[x] = find(parents[x]);}}public boolean same(int x, int y) {return find(x) == find(y);}public void unite(int x, int y) {if (!same(x, y)) {parents[find(x)] = find(y);}}}}class Scanner {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));StringTokenizer st = new StringTokenizer("");public Scanner() throws Exception {}public int nextInt() throws Exception {return Integer.parseInt(next());}public long nextLong() throws Exception {return Long.parseLong(next());}public double nextDouble() throws Exception {return Double.parseDouble(next());}public String next() throws Exception {if (!st.hasMoreTokens()) {st = new StringTokenizer(br.readLine());}return st.nextToken();}}