結果

問題 No.277 根掘り葉掘り
ユーザー kenkooookenkoooo
提出日時 2015-09-08 03:08:27
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 2,896 bytes
コンパイル時間 4,584 ms
コンパイル使用メモリ 89,376 KB
実行使用メモリ 89,468 KB
最終ジャッジ日時 2023-09-26 10:04:07
合計ジャッジ時間 9,075 ms
ジャッジサーバーID
(参考情報)
judge12 / judge13
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 66 ms
50,280 KB
testcase_01 AC 64 ms
50,632 KB
testcase_02 WA -
testcase_03 AC 67 ms
50,464 KB
testcase_04 AC 66 ms
50,728 KB
testcase_05 AC 69 ms
50,316 KB
testcase_06 AC 68 ms
50,292 KB
testcase_07 AC 67 ms
50,676 KB
testcase_08 AC 67 ms
50,472 KB
testcase_09 AC 574 ms
89,468 KB
testcase_10 AC 369 ms
74,280 KB
testcase_11 AC 389 ms
74,344 KB
testcase_12 AC 437 ms
83,208 KB
testcase_13 WA -
testcase_14 WA -
testcase_15 WA -
testcase_16 WA -
testcase_17 WA -
testcase_18 WA -
testcase_19 WA -
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.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
	private int[] R, L;
	private ArrayList<ArrayList<Integer>> graph;

	public void solve() {
		FastScanner scanner = new FastScanner();
		int N = (int) scanner.nextLong();
		graph = new ArrayList<>();
		for (int i = 0; i < N; i++) {
			graph.add(new ArrayList<Integer>());
		}

		for (int i = 0; i < N - 1; i++) {
			int from = (int) scanner.nextLong() - 1;
			int to = (int) scanner.nextLong() - 1;
			graph.get(from).add(to);
			graph.get(to).add(from);
		}
		R = new int[N];
		Arrays.fill(R, N * 2);
		L = new int[N];
		Arrays.fill(L, N * 2);
		R[0] = dfs(0, -1, 0);

		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < N; i++) {
			builder.append(Math.min(L[i], R[i]) + "\n");
		}
		System.out.print(builder.toString());
	}

	private int dfs(int now, int parent, int dist) {
		L[now] = dist;
		if (graph.get(now).size() == 1 && now != 0) {
			return 0;
		}

		int fromLeaf = Integer.MAX_VALUE;
		for (int next : graph.get(now)) {
			if (next != parent) {
				R[next] = Math.min(R[next], dfs(next, now, dist + 1));
				fromLeaf = Math.min(R[next], fromLeaf);
			}
		}
		return fromLeaf + 1;
	}

	public static void main(String[] args) {
		new Main().solve();
	}
}

class FastScanner {
	private final InputStream in = System.in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	}

	public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}
}
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