結果

問題 No.277 根掘り葉掘り
ユーザー uwiuwi
提出日時 2015-09-08 05:22:42
言語 Java17
(openjdk 17.0.1)
結果
AC  
実行時間 304 ms / 3,000 ms
コード長 4,323 bytes
コンパイル時間 3,380 ms
使用メモリ 48,880 KB
最終ジャッジ日時 2023-02-17 08:05:30
合計ジャッジ時間 8,739 ms
ジャッジサーバーID
（参考情報） 		judge13 / judge15
このコードへのチャレンジ（β）

テストケース

テストケース表示
入力 結果 実行時間
使用メモリ
testcase_00 AC 56 ms
34,016 KB
testcase_01 AC 55 ms
34,128 KB
testcase_02 AC 55 ms
34,172 KB
testcase_03 AC 56 ms
34,116 KB
testcase_04 AC 56 ms
33,972 KB
testcase_05 AC 57 ms
34,240 KB
testcase_06 AC 56 ms
34,240 KB
testcase_07 AC 56 ms
34,152 KB
testcase_08 AC 55 ms
33,960 KB
testcase_09 AC 304 ms
46,864 KB
testcase_10 AC 259 ms
48,400 KB
testcase_11 AC 285 ms
48,056 KB
testcase_12 AC 298 ms
48,816 KB
testcase_13 AC 296 ms
48,328 KB
testcase_14 AC 294 ms
47,012 KB
testcase_15 AC 296 ms
46,000 KB
testcase_16 AC 302 ms
45,732 KB
testcase_17 AC 284 ms
47,472 KB
testcase_18 AC 268 ms
48,880 KB
testcase_19 AC 293 ms
48,200 KB
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 # 

package q6xx;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class Q666 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni();
		int[] from = new int[n - 1];
		int[] to = new int[n - 1];
		for (int i = 0; i < n - 1; i++) {
			from[i] = ni() - 1;
			to[i] = ni() - 1;
		}
		int[][] g = packU(n, from, to);
		int[][] pars = parents3(g, 0);
		int[] par = pars[0], ord = pars[1], dep = pars[2];
		int[] dp = new int[n];
		for(int i = n-1;i >= 0;i--){
			int cur = ord[i];
			if(i > 0 && g[cur].length == 1){
				dp[cur] = 0;
			}else{
				dp[cur] = 9999999;
				for(int e : g[cur]){
					if(par[cur] != e){
						dp[cur] = Math.min(dp[cur], dp[e] + 1);
					}
				}
			}
		}
		for(int i = 1;i < n;i++){
			int cur = ord[i];
			dp[cur] = Math.min(dp[cur], dp[par[cur]]+1);
		}
		for(int i = 0;i < n;i++){
			out.println(Math.min(dep[i], dp[i]));
		}
	}

	public static int[][] parents3(int[][] g, int root) {
		int n = g.length;
		int[] par = new int[n];
		Arrays.fill(par, -1);

		int[] depth = new int[n];
		depth[0] = 0;

		int[] q = new int[n];
		q[0] = root;
		for (int p = 0, r = 1; p < r; p++) {
			int cur = q[p];
			for (int nex : g[cur]) {
				if (par[cur] != nex) {
					q[r++] = nex;
					par[nex] = cur;
					depth[nex] = depth[cur] + 1;
				}
			}
		}
		return new int[][] { par, q, depth };
	}

	static int[][] packU(int n, int[] from, int[] to) {
		int[][] g = new int[n][];
		int[] p = new int[n];
		for (int f : from)
			p[f]++;
		for (int t : to)
			p[t]++;
		for (int i = 0; i < n; i++)
			g[i] = new int[p[i]];
		for (int i = 0; i < from.length; i++) {
			g[from[i]][--p[from[i]]] = to[i];
			g[to[i]][--p[to[i]]] = from[i];
		}
		return g;
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
	}
	
	public static void main(String[] args) throws Exception { new Q666().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private char[][] nm(int n, int m)
	{
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}
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