結果

問題 No.912 赤黒木
ユーザー uwiuwi
提出日時 2019-10-18 22:01:23
言語 Java21
(openjdk 21)
結果
AC  
実行時間 525 ms / 3,000 ms
コード長 5,561 bytes
コンパイル時間 4,624 ms
コンパイル使用メモリ 82,480 KB
実行使用メモリ 92,156 KB
最終ジャッジ日時 2023-09-07 23:28:38
合計ジャッジ時間 18,672 ms
ジャッジサーバーID
（参考情報） 		judge14 / judge12
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 41 ms
49,392 KB
testcase_01 AC 41 ms
49,492 KB
testcase_02 AC 45 ms
49,724 KB
testcase_03 AC 45 ms
49,660 KB
testcase_04 AC 42 ms
49,736 KB
testcase_05 AC 46 ms
49,732 KB
testcase_06 AC 45 ms
49,432 KB
testcase_07 AC 45 ms
49,320 KB
testcase_08 AC 43 ms
49,348 KB
testcase_09 AC 44 ms
49,324 KB
testcase_10 AC 43 ms
49,320 KB
testcase_11 AC 45 ms
49,328 KB
testcase_12 AC 519 ms
89,356 KB
testcase_13 AC 506 ms
89,664 KB
testcase_14 AC 491 ms
88,924 KB
testcase_15 AC 513 ms
89,368 KB
testcase_16 AC 502 ms
89,148 KB
testcase_17 AC 503 ms
89,304 KB
testcase_18 AC 493 ms
88,560 KB
testcase_19 AC 460 ms
83,652 KB
testcase_20 AC 482 ms
85,608 KB
testcase_21 AC 474 ms
85,336 KB
testcase_22 AC 487 ms
87,172 KB
testcase_23 AC 513 ms
88,604 KB
testcase_24 AC 511 ms
86,436 KB
testcase_25 AC 471 ms
88,400 KB
testcase_26 AC 480 ms
86,804 KB
testcase_27 AC 460 ms
88,276 KB
testcase_28 AC 524 ms
91,700 KB
testcase_29 AC 525 ms
91,572 KB
testcase_30 AC 521 ms
92,156 KB
testcase_31 AC 521 ms
89,104 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 contest191018;
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 E {
	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[] from2 = new int[n - 1];
		int[] to2 = new int[n - 1];
		for (int i = 0; i < n - 1; i++) {
			from2[i] = ni() - 1;
			to2[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[][] g2 = packU(n, from2, to2);
		
		int ans = n-1;
		int[][] dp = new int[n][3]; // #ignore
		for(int i = 0;i < n;i++) {
			Arrays.fill(dp[i], 99999999);
		}
		boolean[] ex = new boolean[n];
		for(int i = n-1;i >= 0;i--) {
			int cur = ord[i];
			int mat = g2[cur].length % 2;
			int[] ldp = new int[3];
			Arrays.fill(ldp, 99999999);
			if(mat == 1)ldp[1] = 0;
			ldp[0] = 0;
			
			ex[cur] = mat == 1;
			for(int e : g[cur]) {
				if(par[cur] == e)continue;
				if(ex[e]) {
					// 101
					int[] nldp = new int[3];
					Arrays.fill(nldp, 99999999);
					for(int j = 0;j < 3;j++) {
						for(int k = 0;j+k < 3;k++) {
							if(k % 2 == 0) {
								nldp[j+k] = Math.min(nldp[j+k], ldp[j] + dp[e][k] + 1);
							}else {
								nldp[j+k] = Math.min(nldp[j+k], ldp[j] + dp[e][k]);
							}
						}
					}
					ldp = nldp;
				}else {
					// 010
					int[] nldp = new int[3];
					Arrays.fill(nldp, 99999999);
					for(int j = 0;j < 3;j++) {
						for(int k = 0;j+k < 3;k++) {
							if(k % 2 == 1) {
								nldp[j+k] = Math.min(nldp[j+k], ldp[j] + dp[e][k] + 1);
							}else {
								nldp[j+k] = Math.min(nldp[j+k], ldp[j] + dp[e][k]);
							}
						}
					}
					ldp = nldp;
				}
				ex[cur] ^= ex[e];
			}
			dp[cur] = ldp;
		}
		ans += Math.min(dp[0][0], dp[0][2]);
		out.println(ans);
	}

	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");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new E().run(); }
	
	private byte[] inbuf = new byte[1024];
	public 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 int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	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[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	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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