結果

問題 No.1805 Approaching Many Typhoon
ユーザー tenten
提出日時 2023-08-08 09:26:45
言語 Java
(openjdk 23)
結果
AC  
実行時間 88 ms / 2,000 ms
コード長 2,963 bytes
コンパイル時間 3,919 ms
コンパイル使用メモリ 84,136 KB
実行使用メモリ 39,016 KB
最終ジャッジ日時 2024-11-08 15:08:54
合計ジャッジ時間 6,885 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge3
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ファイルパターン 結果
sample AC * 4
other AC * 35
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ソースコード

diff #
プレゼンテーションモードにする

import java.io.*;
import java.util.*;
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();
        int s = sc.nextInt() - 1;
        int g = 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;
        }
        boolean[] atacked = new boolean[n];
        int u = sc.nextInt();
        while (u-- > 0) {
            atacked[sc.nextInt() - 1] = true;
        }
        UnionFindTree uft = new UnionFindTree(n);
        for (int i = 0; i < m; i++) {
            if (!atacked[lefts[i]] && !atacked[rights[i]]) {
                uft.unite(lefts[i], rights[i]);
            }
        }
        if (uft.same(s, g)) {
            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 Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    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 int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}
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