結果

問題 No.1023 Cyclic Tour
ユーザー 37zigen37zigen
提出日時 2020-04-14 01:35:49
言語 Java21
(openjdk 21)
結果
AC  
実行時間 468 ms / 2,000 ms
コード長 4,378 bytes
コンパイル時間 3,028 ms
コンパイル使用メモリ 80,140 KB
実行使用メモリ 107,320 KB
最終ジャッジ日時 2024-04-08 15:08:56
合計ジャッジ時間 23,546 ms
ジャッジサーバーID
(参考情報)
judge13 / judge14
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 70 ms
55,264 KB
testcase_01 AC 53 ms
53,876 KB
testcase_02 AC 52 ms
53,980 KB
testcase_03 AC 52 ms
53,992 KB
testcase_04 AC 293 ms
73,696 KB
testcase_05 AC 303 ms
74,724 KB
testcase_06 AC 322 ms
76,004 KB
testcase_07 AC 308 ms
75,008 KB
testcase_08 AC 260 ms
72,656 KB
testcase_09 AC 287 ms
73,076 KB
testcase_10 AC 284 ms
74,184 KB
testcase_11 AC 323 ms
81,300 KB
testcase_12 AC 278 ms
74,312 KB
testcase_13 AC 270 ms
73,952 KB
testcase_14 AC 266 ms
74,064 KB
testcase_15 AC 304 ms
74,608 KB
testcase_16 AC 317 ms
74,684 KB
testcase_17 AC 339 ms
79,916 KB
testcase_18 AC 367 ms
75,348 KB
testcase_19 AC 330 ms
75,460 KB
testcase_20 AC 429 ms
85,624 KB
testcase_21 AC 416 ms
85,280 KB
testcase_22 AC 457 ms
83,308 KB
testcase_23 AC 454 ms
83,508 KB
testcase_24 AC 436 ms
82,972 KB
testcase_25 AC 437 ms
84,280 KB
testcase_26 AC 425 ms
84,912 KB
testcase_27 AC 439 ms
84,472 KB
testcase_28 AC 433 ms
84,068 KB
testcase_29 AC 359 ms
83,468 KB
testcase_30 AC 418 ms
84,164 KB
testcase_31 AC 411 ms
85,072 KB
testcase_32 AC 436 ms
91,148 KB
testcase_33 AC 435 ms
87,612 KB
testcase_34 AC 324 ms
75,756 KB
testcase_35 AC 314 ms
78,060 KB
testcase_36 AC 432 ms
83,412 KB
testcase_37 AC 442 ms
87,940 KB
testcase_38 AC 387 ms
87,608 KB
testcase_39 AC 468 ms
83,388 KB
testcase_40 AC 437 ms
82,732 KB
testcase_41 AC 423 ms
84,428 KB
testcase_42 AC 389 ms
85,512 KB
testcase_43 AC 263 ms
73,344 KB
testcase_44 AC 373 ms
78,004 KB
testcase_45 AC 313 ms
88,716 KB
testcase_46 AC 300 ms
91,676 KB
testcase_47 AC 371 ms
107,320 KB
testcase_48 AC 420 ms
85,788 KB
testcase_49 AC 412 ms
85,956 KB
testcase_50 AC 429 ms
85,920 KB
testcase_51 AC 378 ms
85,732 KB
testcase_52 AC 366 ms
85,108 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.util.ArrayList;
import java.util.Arrays;
import java.util.NoSuchElementException;

class DJSet {
	int n;
	int[] upper;
	public DJSet(int n) {
		this.n=n;
		upper=new int[n];
		Arrays.fill(upper, -1);
	}
	int root(int x) {
		return upper[x]<0?x:(upper[x]=root(upper[x]));
	}
	boolean equiv(int x,int y) {
		return root(x)==root(y);
	}
	void setUnion(int x,int y) {
		x=root(x);y=root(y);
		if(x==y) return;
		if (upper[x]<upper[y]) {
			x^=y;y^=x;x^=y;
		}
		if (upper[x]==upper[y]) --upper[y];
		upper[x]=y;
	}
}

public class Main {
	
	void dfs_uni(int cur,int par,ArrayList<Integer>[] g,int[] col) {
		col[cur]=1;
		for (int dst:g[cur]) {
			if (col[dst]==1) {
				System.out.println("Yes");
				System.exit(0);
			}
			if (col[dst]==0) dfs_uni(dst,cur,g,col);
		}
		col[cur]=2;
	}
	
	void dfs_bi(int cur,int par,ArrayList<Integer>[] g,int[] col) {
		col[cur]=1;
		for (int dst:g[cur]) {
			if (dst==par) continue;
			if (col[dst]!=0) {
				System.out.println("Yes");
				System.exit(0);
			}
			if (col[dst]==0) dfs_bi(dst,cur,g,col);
		}
		col[cur]=2;
	}
	
	void run() {
		FastScanner sc=new FastScanner();
		PrintWriter pw=new PrintWriter(System.out);
		
		int N=sc.nextInt();
		int M=sc.nextInt();
		ArrayList<Integer>[] g=new ArrayList[N];
		ArrayList<Integer>[] g2=new ArrayList[N];
		DJSet ds=new DJSet(N);
		int[] a=new int[M];
		int[] b=new int[M];
		int[] c=new int[M];
		for (int i=0;i<N;++i) g[i]=new ArrayList<>();
		for (int i=0;i<N;++i) g2[i]=new ArrayList<>();
		for (int i=0;i<M;++i) {
			a[i]=sc.nextInt();
			b[i]=sc.nextInt();
			c[i]=sc.nextInt();
			--a[i];--b[i];
			if (c[i]==1) { // bi
				g[a[i]].add(b[i]);
				g[b[i]].add(a[i]);
				ds.setUnion(a[i], b[i]);
			}
		}
		int[] col=new int[N];
		for (int i=0;i<N;++i) {
			if (col[i]==0) dfs_bi(i,-1,g,col);
		}
		for (int i=0;i<M;++i) {
			if (c[i]==2) { // uni
				if (ds.equiv(a[i], b[i])) {
					System.out.println("Yes");
					return;
				}
				g2[ds.root(a[i])].add(ds.root(b[i]));
			}
		}
		Arrays.fill(col, 0);
		dfs_uni(ds.root(0),-1,g2,col);
		for (int i=0;i<N;++i) {
			if (i==ds.root(i) && col[i]==0) dfs_uni(ds.root(i), -1, g2, col);
		}
		
		pw.println("No");
		pw.close();
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
	
    public static void main(String[] args) {
    	new Main().run();
    }
}




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();
        }
    }
    public int nextInt() {
    	return (int)nextLong();
    }
}
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