結果

問題 No.1582 Vertexes vs Edges
ユーザー cyclerecycle9cyclerecycle9
提出日時 2021-09-10 21:49:46
言語 Java21
(openjdk 21)
結果
AC  
実行時間 245 ms / 2,000 ms
コード長 4,620 bytes
コンパイル時間 5,040 ms
コンパイル使用メモリ 79,732 KB
実行使用メモリ 66,380 KB
最終ジャッジ日時 2024-06-11 23:27:55
合計ジャッジ時間 10,889 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge5
このコードへのチャレンジ
（要ログイン）

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 57 ms
50,312 KB
testcase_01 AC 59 ms
50,052 KB
testcase_02 AC 57 ms
50,220 KB
testcase_03 AC 57 ms
50,048 KB
testcase_04 AC 81 ms
50,820 KB
testcase_05 AC 191 ms
66,380 KB
testcase_06 AC 85 ms
51,012 KB
testcase_07 AC 101 ms
53,656 KB
testcase_08 AC 139 ms
61,280 KB
testcase_09 AC 189 ms
65,632 KB
testcase_10 AC 147 ms
61,376 KB
testcase_11 AC 89 ms
51,168 KB
testcase_12 AC 127 ms
56,832 KB
testcase_13 AC 165 ms
61,864 KB
testcase_14 AC 174 ms
61,792 KB
testcase_15 AC 205 ms
65,080 KB
testcase_16 AC 159 ms
57,312 KB
testcase_17 AC 168 ms
61,952 KB
testcase_18 AC 208 ms
65,484 KB
testcase_19 AC 180 ms
63,632 KB
testcase_20 AC 163 ms
61,884 KB
testcase_21 AC 173 ms
61,640 KB
testcase_22 AC 199 ms
65,296 KB
testcase_23 AC 143 ms
57,064 KB
testcase_24 AC 111 ms
54,176 KB
testcase_25 AC 166 ms
61,920 KB
testcase_26 AC 145 ms
57,044 KB
testcase_27 AC 223 ms
65,388 KB
testcase_28 AC 130 ms
56,904 KB
testcase_29 AC 181 ms
62,004 KB
testcase_30 AC 163 ms
57,736 KB
testcase_31 AC 177 ms
61,984 KB
testcase_32 AC 140 ms
56,820 KB
testcase_33 AC 239 ms
66,012 KB
testcase_34 AC 238 ms
66,044 KB
testcase_35 AC 245 ms
65,916 KB
testcase_36 AC 56 ms
50,132 KB
testcase_37 AC 55 ms
50,260 KB
testcase_38 AC 57 ms
50,244 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 # 

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.*;

public class Main {
	static final long MOD1=1000000007;
	static final long MOD=998244353;
	static int ans=0;
	public static void main(String[] args){
		PrintWriter out = new PrintWriter(System.out);
		InputReader sc=new InputReader(System.in);
		int N = sc.nextInt();
		graph G = new graph(N);
		for (int i = 0; i < N - 1; i++) {
			int a = sc.nextInt()-1;
			int b = sc.nextInt()-1;
			G.addEdge(a, b, 1);
			G.addEdge(b, a, 1);
		}
		int[][] dp = new int[N][2];
		G.dfs(0, -1, dp);
		System.out.println(N - Math.max(dp[0][0], dp[0][1]));
   	}
	static class Edge implements Comparable<Edge>{
		int to;
		long v;
		public Edge(int to,long v) {
			this.to=to;
			this.v=v;
		}
		@Override
    	public boolean equals(Object obj){
    		if(obj instanceof Edge) {
    			Edge other = (Edge) obj;
    			return other.to==this.to && other.v==this.v;
    		}
    		return false;
    	}//同値の定義
    	@Override
    	public int hashCode() {
    		return Objects.hash(this.to,this.v);
    	}
    	@Override
		  public int compareTo( Edge p2 ){
			 if (this.v>p2.v) {
				return 1;
			}
			 else if (this.v<p2.v) {
				return -1;
			}
			 else {
				return 0;
			}
		  }
	} 
	static class graph{
		ArrayList<Edge>[] list;
		int size;
		long INF=Long.MAX_VALUE/2;
		int[] color;
		@SuppressWarnings("unchecked")
		public graph(int n) {
			size = n;
			list = new ArrayList[n];
			color =new int[n];
			for(int i=0;i<n;i++){
				list[i] = new ArrayList<Edge>();
			}
		}
		void addEdge(int from,int to,long w) {
			list[from].add(new Edge(to,w));
		}
		void dfs(int v, int p, int[][] dp) {
			dp[v][0] = 1;
			for (Edge e: list[v]) {
				if (e.to==p)continue;
				dfs(e.to, v, dp);
				dp[v][0] += dp[e.to][1];
				dp[v][1] += Math.max(dp[e.to][0], dp[e.to][1]);
			}
		}
	}
	static class InputReader { 
		private InputStream in;
		private byte[] buffer = new byte[1024];
		private int curbuf;
		private int lenbuf;
		public InputReader(InputStream in) {
			this.in = in;
			this.curbuf = this.lenbuf = 0;
		}
		public boolean hasNextByte() {
			if (curbuf >= lenbuf) {
				curbuf = 0;
				try {
					lenbuf = in.read(buffer);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (lenbuf <= 0)
					return false;
			}
			return true;
		}
 
		private int readByte() {
			if (hasNextByte())
				return buffer[curbuf++];
			else
				return -1;
		}
 
		private boolean isSpaceChar(int c) {
			return !(c >= 33 && c <= 126);
		}
 
		private void skip() {
			while (hasNextByte() && isSpaceChar(buffer[curbuf]))
				curbuf++;
		}
 
		public boolean hasNext() {
			skip();
			return hasNextByte();
		}
 
		public String next() {
			if (!hasNext())
				throw new NoSuchElementException();
			StringBuilder sb = new StringBuilder();
			int b = readByte();
			while (!isSpaceChar(b)) {
				sb.appendCodePoint(b);
				b = readByte();
			}
			return sb.toString();
		}
 
		public int nextInt() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}
 
		public long nextLong() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}
 
		public double nextDouble() {
			return Double.parseDouble(next());
		}
 
		public int[] nextIntArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}
		public double[] nextDoubleArray(int n) {
			double[] a = new double[n];
			for (int i = 0; i < n; i++)
				a[i] = nextDouble();
			return a;
		}
		public long[] nextLongArray(int n) {
			long[] a = new long[n];
			for (int i = 0; i < n; i++)
				a[i] = nextLong();
			return a;
		}
 
		public char[][] nextCharMap(int n, int m) {
			char[][] map = new char[n][m];
			for (int i = 0; i < n; i++)
				map[i] = next().toCharArray();
			return map;
		}
	}
}
0