結果

問題 No.2072 Anatomy
ユーザー tentententen
提出日時 2023-01-20 10:39:22
言語 Java
(openjdk 23)
結果
AC  
実行時間 415 ms / 2,000 ms
コード長 3,177 bytes
コンパイル時間 2,684 ms
コンパイル使用メモリ 84,588 KB
実行使用メモリ 57,132 KB
最終ジャッジ日時 2024-06-23 01:31:03
合計ジャッジ時間 13,369 ms
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 2
other AC * 27
権限があれば一括ダウンロードができます

ソースコード

diff #

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();
        ArrayDeque<Bridge> current = new ArrayDeque<>();
        for (int i = 0; i < m; i++) {
            current.addFirst(new Bridge(sc.nextInt() - 1, sc.nextInt() - 1));
        }
        UnionFindTree uft = new UnionFindTree(n);
        int ans = 0;
        while (current.size() > 0) {
            uft.unite(current.poll());
        }
        System.out.println(uft.getCount(0));
    }
    
    static class UnionFindTree {
        int[] parents;
        int[] counts;
        
        public UnionFindTree(int size) {
            parents = new int[size];
            counts = 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) {
            int xx = find(x);
            int yy = find(y);
            if (xx == yy) {
                counts[xx]++;
            } else {
                counts[yy] = Math.max(counts[xx], counts[yy]) + 1;
                parents[xx] = yy;
            }
        }
        
        public void unite(Bridge x) {
            unite(x.left, x.right);
        }
        
        public int getCount(int x) {
            return counts[find(x)];
        }
    }
    
    static class Bridge {
        int left;
        int right;
        
        public Bridge(int left, int right) {
            this.left = left;
            this.right = right;
        }
    }
}

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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