結果

問題 No.1054 Union add query
ユーザー 37zigen37zigen
提出日時 2019-11-09 03:11:23
言語 Java21
(openjdk 21)
結果
AC  
実行時間 955 ms / 2,000 ms
コード長 4,181 bytes
コンパイル時間 2,341 ms
コンパイル使用メモリ 77,076 KB
実行使用メモリ 100,756 KB
最終ジャッジ日時 2023-08-18 17:17:01
合計ジャッジ時間 9,066 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge14
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
実行使用メモリ
testcase_00 AC 43 ms
49,476 KB
testcase_01 AC 44 ms
49,380 KB
testcase_02 AC 43 ms
49,776 KB
testcase_03 AC 843 ms
87,420 KB
testcase_04 AC 694 ms
92,856 KB
testcase_05 AC 955 ms
91,932 KB
testcase_06 AC 699 ms
100,756 KB
testcase_07 AC 649 ms
100,612 KB
testcase_08 AC 620 ms
98,140 KB
testcase_09 AC 512 ms
66,164 KB
testcase_10 AC 171 ms
61,164 KB
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ソースコード

diff # 

//check violation of constraints

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashSet;
import java.util.NoSuchElementException;

public class Main {

	class DJSet {
		int n;
		int[] upper;
		long[] weight;

		public DJSet(int n) {
			this.n = n;
			upper = new int[n];
			weight = new long[n];
			Arrays.fill(upper, -1);
		}

		void add_weight(int x, long w) {
			x = root(x);
			weight[x] += w;
		}

		long get_weight(int x) {
			return weight[x] + (upper[x] < 0 ? 0 : get_weight(upper[x]));
		}

		int root(int x) {
			return upper[x] < 0 ? 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;
			}
			upper[y] += upper[x];
			upper[x] = y;
			weight[x] -= weight[y];
		}
	}

	void run() {
		FastScanner sc = new FastScanner();
		int N = sc.nextInt();
		int Q = sc.nextInt();
		if (!(1 <= N && N <= 5e5 && 1 <= Q && Q <= 5e5))
			throw new AssertionError();
		DJSet ds = new DJSet(N);
		PrintWriter pw = new PrintWriter(System.out);
		HashSet<Long> set = new HashSet<>();
		for (int q = 0; q < Q; ++q) {
			int T = sc.nextInt();
			int A = sc.nextInt();
			int B = sc.nextInt();
			
			//-----------------------------------------
			if (!(T == 1 || T == 2 || T == 3))
				throw new AssertionError();
			// T==1 の時、self-loopがないことから A!=B
			if (!((T == 1 && 1 <= A && A <= N && 1 <= B && B <= N && A != B)
					|| (T == 2 && 1 <= A && A <= N && -2000 <= B && B <= 2000)
					|| (T == 3 && 1 <= A && A <= N && B == 0)))
				throw new AssertionError();
			//-----------------------------------------
			
			--A;
			if (T == 1) {
				--B;
				long add1 = (long) A << 30 | B;
				long add2 = (long) B << 30 | A;
				if (set.contains(add1) || set.contains(add2))
					throw new AssertionError(); // multiple edges
				set.add(add1);
				set.add(add2);
				if (ds.equiv(A, B))
					continue;
				ds.setUnion(A, B);
			} else if (T == 2) {
				ds.add_weight(A, B);
			} else if (T == 3) {
				pw.println(ds.get_weight(A));
			}
		}
		pw.close();
	}

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

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}

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;
	}

	public boolean hasNext() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
		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() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
			throw new NumberFormatException();
		return (int) nl;
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}
}
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