#179500 (Java21) No.529 帰省ラッシュ

提出ソース

結果

問題	No.529 帰省ラッシュ
ユーザー	37zigen
提出日時	2017-06-11 13:33:04
言語	Java21 (openjdk 21)
結果	AC
実行時間	2,676 ms / 4,500 ms
コード長	9,066 bytes
コンパイル時間	2,958 ms
コンパイル使用メモリ	89,984 KB
実行使用メモリ	161,220 KB
最終ジャッジ日時	2024-09-24 16:09:57
合計ジャッジ時間	24,936 ms
ジャッジサーバーID （参考情報）	judge3 / judge5

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	53 ms 50,432 KB
testcase_01	AC	53 ms 50,452 KB
testcase_02	AC	53 ms 50,172 KB
testcase_03	AC	52 ms 50,392 KB
testcase_04	AC	125 ms 52,208 KB
testcase_05	AC	124 ms 52,364 KB
testcase_06	AC	122 ms 52,316 KB
testcase_07	AC	114 ms 52,296 KB
testcase_08	AC	1,073 ms 86,456 KB
testcase_09	AC	1,491 ms 93,560 KB
testcase_10	AC	2,640 ms 123,628 KB
testcase_11	AC	2,676 ms 119,196 KB
testcase_12	AC	978 ms 94,144 KB
testcase_13	AC	987 ms 143,448 KB
testcase_14	AC	810 ms 88,936 KB
testcase_15	AC	1,897 ms 131,176 KB
testcase_16	AC	2,205 ms 141,632 KB
testcase_17	AC	1,808 ms 154,624 KB
testcase_18	AC	1,808 ms 161,220 KB
testcase_19	AC	1,503 ms 156,068 KB

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ソースコード

raw source code

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.NoSuchElementException;
import java.util.PriorityQueue;

class Main implements Runnable {
	public static void main(String[] args) {
		new Main().run();
	}

	class State {
		int i;
		int parent;
		int j;// 操作後g[i][j]に潜る

		public State(int i_, int parent_, int j_) {
			i = i_;
			parent = parent_;
			j = j_;
		}
	}

	int two_edge_connected_componets(ArrayList<Integer>[] g, int[] col) {
		int n = g.length;
		Arrays.fill(col, -1);
		int cols = 0;
		int[] low = new int[n];
		int[] ord = new int[n];
		boolean[] marked = new boolean[n];
		Arrays.fill(low, -1);
		Arrays.fill(ord, -1);
		int order = 0;
		ArrayDeque<State> stk = new ArrayDeque<>();
		ArrayDeque<Integer> pnd = new ArrayDeque<>();
		for (int ii = 0; ii < n; ++ii) {
			if (ord[ii] == -1) {
				stk.add(new State(ii, -1, 0));
			}
			while (!stk.isEmpty()) {
				State s = stk.pollFirst();
				if (ord[s.i] == -1) {
					low[s.i] = (ord[s.i] = order++);
					pnd.addFirst(s.i);
				}
				if (s.j > 0 && s.parent != g[s.i].get(s.j - 1) && !marked[g[s.i].get(s.j - 1)]) {
					low[s.i] = Math.min(low[s.i], low[g[s.i].get(s.j - 1)]);
				}
				if (s.j == g[s.i].size() && low[s.i] == ord[s.i]) {
					while (true) {
						int v = pnd.pollFirst();
						col[v] = cols;
						marked[v] = true;
						if (v == s.i)
							break;
					}
					++cols;
				}
				if (s.j == g[s.i].size())
					continue;
				int v = g[s.i].get(s.j);
				stk.addFirst(new State(s.i, s.parent, s.j + 1));
				if (ord[v] == -1) {
					stk.addFirst(new State(v, s.i, 0));
				} else if (v != s.parent && !marked[v]) {
					low[s.i] = Math.min(low[s.i], low[v]);
				}
			}
		}
		return cols;
	}

	@SuppressWarnings("unchecked")
	public void run() {
		Scanner sc = new Scanner();
		PrintWriter pw = new PrintWriter(System.out);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int q = sc.nextInt();
		ArrayList<Integer>[] g = new ArrayList[n];
		for (int i = 0; i < n; ++i) {
			g[i] = new ArrayList<>();
		}

		for (int i = 0; i < m; ++i) {
			int a = sc.nextInt() - 1;
			int b = sc.nextInt() - 1;
			g[a].add(b);
			g[b].add(a);
		}
		int[] col = new int[n];
		int cols = two_edge_connected_componets(g, col);
		ArrayList<Integer>[] h = new ArrayList[cols];
		PriorityQueue<Long>[] w = new PriorityQueue[cols];
		for (int i = 0; i < cols; ++i) {
			w[i] = new PriorityQueue<>(new Comparator<Long>() {
				@Override
				public int compare(Long o1, Long o2) {
					return -Long.compare(o1, o2);
				}
			});
		}
		for (int i = 0; i < cols; ++i) {
			w[i].add(-1L);
		}
		for (int i = 0; i < cols; ++i) {
			h[i] = new ArrayList<>();
		}
		for (int i = 0; i < n; ++i) {
			for (int j : g[i]) {
				int a = col[i];
				int b = col[j];
				if (a == b)
					continue;
				if (h[a].contains(b))
					continue;
				h[a].add(b);
				h[b].add(a);
			}
		}
		for (int i = 0; i < cols; ++i) {
			Collections.sort(h[i]);
			for (int j = 0; j < h[i].size(); ++j) {
				while (j + 1 < h[i].size() && h[i].get(j) == h[i].get(j + 1)) {
					h[i].remove(j + 1);
				}
			}
		}

		HLDecomposition hl = new HLDecomposition(cols);
		for (int i = 0; i < cols; ++i) {
			for (int j : h[i]) {
				if (i > j) {
					hl.ae(i, j);
				}
			}
		}
		hl.pre();
		SegmentTree st = new SegmentTree(cols);
		int[] ref = new int[cols];
		Arrays.fill(ref, -1);
		for (int i = 0; i < cols; ++i) {
			ref[hl.id[i]] = i;
		}
		while (q-- > 0) {
			int t = sc.nextInt();
			if (t == 1) {// modification query
				int u = sc.nextInt() - 1;
				long v = sc.nextInt();
				u = col[u];
				w[u].add(v);
				st.setVal(hl.id[u], w[u].peek());
			} else {// ouput query
				int src = sc.nextInt() - 1;
				int dst = sc.nextInt() - 1;
				src = col[src];
				dst = col[dst];
				long v = output(src, dst, hl, st);
				pw.println(v == -1 ? v : v >> 32);
				if (v != -1) {
					w[ref[(int) v]].poll();
					st.setVal((int) v, w[ref[(int) v]].peek());
				}
			}
		}
		pw.close();
	}

	long output(int a, int b, HLDecomposition hl, SegmentTree st) {
		long ea = -1;
		long eb = -1;
		while (hl.head[a] != hl.head[b]) {
			if (hl.depth[hl.head[a]] < hl.depth[hl.head[b]]) {
				int tmp = a;
				a = b;
				b = tmp;
				long tmp_e = ea;
				ea = eb;
				eb = tmp_e;
			}
			ea = merge(st.query(hl.id[hl.head[a]], hl.id[a] + 1), ea);
			a = hl.parent[hl.head[a]];
		}
		if (hl.depth[a] < hl.depth[b]) {
			int tmp = a;
			a = b;
			b = tmp;
			long tmp_e = ea;
			ea = eb;
			eb = tmp_e;
		}
		return merge(eb, merge(st.query(hl.id[b], hl.id[a] + 1), ea));
	}

	long merge(long a, long b) {
		return Math.max(a, b);
	}

	class SegmentTree {
		int n;
		long[] Vs;

		public SegmentTree(int n_) {
			n = 1;
			while (n < n_) {
				n *= 2;
			}
			Vs = new long[2 * n - 1];
			for (int i = 0; i < n; ++i) {
				Vs[i + n - 1] = -1;
			}
			for (int i = n - 2; i >= 0; --i) {
				Vs[i] = merge(Vs[2 * i + 1], Vs[2 * i + 2]);
			}
		}

		void setVal(int k, long val) {
			k += n - 1;
			if (val != -1)
				Vs[k] = val << 32 | (k - (n - 1));
			else
				Vs[k] = -1;
			while (k > 0) {
				k = (k - 1) / 2;
				Vs[k] = merge(Vs[2 * k + 1], Vs[2 * k + 2]);
			}
		}

		// [a,b),[l,r)
		long query(int a, int b) {
			return query(a, b, 0, n, 0);
		}

		long query(int a, int b, int l, int r, int k) {
			if (b <= l || r <= a) {
				return -1L;
			}
			if (a <= l && r <= b) {
				return Vs[k];
			} else {
				long vl = query(a, b, l, (l + r) / 2, 2 * k + 1);
				long vr = query(a, b, (l + r) / 2, r, 2 * k + 2);
				return merge(vl, vr);
			}
		}
	}

	class HLDecomposition {
		int n;
		int[] depth;
		int[] head;
		int[] heavy;
		int[] parent;
		int[] sz;
		ArrayList<Integer>[] g;
		int[] id;

		@SuppressWarnings("unchecked")
		public HLDecomposition(int n) {
			this.n = n;
			depth = new int[n];
			head = new int[n];
			heavy = new int[n];
			parent = new int[n];
			id = new int[n];
			sz = new int[n];
			g = new ArrayList[n];
			for (int i = 0; i < n; ++i) {
				g[i] = new ArrayList<>();
			}
			Arrays.fill(head, -1);
			Arrays.fill(id, -1);
			Arrays.fill(parent, -1);
		}

		void ae(int a, int b) {
			g[a].add(b);
			g[b].add(a);
		}

		void pre() {
			dfs(0, -1);
			bfs();
		}

		void bfs() {
			ArrayDeque<Integer> pend = new ArrayDeque<>();
			int gen = 0;
			pend.add(0);
			while (!pend.isEmpty()) {
				int v = pend.pollFirst();
				int top = v;
				for (; v != -1; v = heavy[v]) {
					id[v] = gen++;
					head[v] = top;
					for (int d : g[v]) {
						if (d == parent[v] || d == heavy[v]) {
							continue;
						}
						pend.add(d);
					}
				}
			}
		}

		int lca(int u, int v) {
			if (head[u] != head[v]) {
				if (depth[head[u]] < depth[head[v]]) {
					int tmp = u;
					u = v;
					v = tmp;
				}
				return lca(parent[head[u]], v);
			} else {
				if (depth[u] > depth[v]) {
					int tmp = u;
					u = v;
					v = tmp;
				}
				return u;
			}
		}

		int dfs(int c, int p) {
			parent[c] = p;
			int s = 1;
			int to = -1;
			for (int d : g[c]) {
				if (d == p)
					continue;
				depth[d] = depth[c] + 1;
				s += dfs(d, c);
				if (to == -1 || sz[d] > sz[to]) {
					to = d;
				}
			}
			sz[c] = s;
			heavy[c] = to;
			return s;
		}

	}

	class Scanner {
		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;
		}

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

		private int readByte() {
			if (hasNextByte())
				return buffer[ptr++];
			else
				return -1;
		}

		private 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();
			}
		}
	}

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

yukicoder

結果

テストケース

ソースコード