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 #
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();
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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