結果

問題 No.468 役に立つ競技プログラミング実践編
ユーザー GrenacheGrenache
提出日時 2017-01-16 12:38:50
言語 Java21
(openjdk 21)
結果
AC  
実行時間 888 ms / 2,000 ms
コード長 5,549 bytes
コンパイル時間 4,245 ms
コンパイル使用メモリ 81,624 KB
実行使用メモリ 76,224 KB
最終ジャッジ日時 2024-06-01 09:46:02
合計ジャッジ時間 19,684 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
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 125 ms
41,720 KB
testcase_01 AC 113 ms
40,260 KB
testcase_02 AC 120 ms
41,156 KB
testcase_03 AC 133 ms
41,288 KB
testcase_04 AC 120 ms
40,588 KB
testcase_05 AC 125 ms
40,540 KB
testcase_06 AC 129 ms
40,488 KB
testcase_07 AC 132 ms
41,276 KB
testcase_08 AC 128 ms
40,812 KB
testcase_09 AC 128 ms
40,896 KB
testcase_10 AC 133 ms
41,736 KB
testcase_11 AC 133 ms
41,552 KB
testcase_12 AC 118 ms
40,072 KB
testcase_13 AC 128 ms
40,516 KB
testcase_14 AC 173 ms
42,068 KB
testcase_15 AC 173 ms
41,784 KB
testcase_16 AC 168 ms
41,940 KB
testcase_17 AC 168 ms
41,736 KB
testcase_18 AC 172 ms
42,100 KB
testcase_19 AC 172 ms
42,036 KB
testcase_20 AC 174 ms
41,864 KB
testcase_21 AC 176 ms
42,032 KB
testcase_22 AC 170 ms
42,008 KB
testcase_23 AC 174 ms
42,580 KB
testcase_24 AC 864 ms
73,576 KB
testcase_25 AC 846 ms
72,888 KB
testcase_26 AC 839 ms
72,896 KB
testcase_27 AC 844 ms
75,484 KB
testcase_28 AC 830 ms
75,276 KB
testcase_29 AC 862 ms
75,552 KB
testcase_30 AC 848 ms
75,308 KB
testcase_31 AC 877 ms
75,392 KB
testcase_32 AC 888 ms
76,224 KB
testcase_33 AC 845 ms
72,952 KB
testcase_34 AC 543 ms
69,932 KB
testcase_35 AC 151 ms
41,388 KB
testcase_36 AC 124 ms
40,532 KB
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ソースコード

diff # 

import java.io.*;
import java.util.*;


public class Main_yukicoder468_1 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();
		int m = sc.nextInt();

		List<List<Edge>> edges = new ArrayList<>();
		for (int i = 0; i < n; i++) {
			edges.add(new ArrayList<>());
		}

		for (int i = 0; i < m; i++) {
			int a = sc.nextInt();
			int b = sc.nextInt();
			int c = sc.nextInt();

			edges.get(a).add(new Edge(a, b, c));
		}

		boolean[] used = new boolean[n];
		boolean[] gray = new boolean[n];

		List<Integer> ts = new ArrayList<>();
		for (int i = 0; i < n; i++) {
			Deque<Integer> st = new ArrayDeque<>();
			st.push(i);
			while (!st.isEmpty()) {
				int e = st.peek();

				if (used[e]) {
					st.pop();
					continue;
				}

				if (gray[e]) {
					st.pop();
					used[e] = true;
					ts.add(e);
				} else {
					gray[e] = true;
					for (Edge next : edges.get(e)) {
						if (used[next.v]) {
							continue;
						}
						if (gray[next.v]) {
							// 後退辺
							continue;
						}

						st.push(next.v);
					}
				}
			}
		}

		Collections.reverse(ts);
		int[] d = new int[n];
		for (int e : ts) {
			for (Edge next : edges.get(e)) {
				d[next.v] = Math.max(d[next.v], d[e] + next.w);
			}
		}

		Collections.reverse(ts);
		int[] d2 = new int[n];
		Arrays.fill(d2, Integer.MAX_VALUE);
		d2[ts.get(0)] = d[ts.get(0)];
		for (int e : ts) {
			for (Edge next : edges.get(e)) {
				d2[e] = Math.min(d2[e], d2[next.v] - next.w);
			}
		}

		int diff = 0;
		for (int i = 0; i < n; i++) {
			if (d[i] != d2[i]) {
				diff++;
			}
		}

		pr.printf("%d %d/%d\n", d[ts.get(0)], diff, n);
	}

	private static class Edge {
		@SuppressWarnings("unused")
		int u; // from
		int v; // to
		int w; // cost

		Edge(int u, int v, int w) {
			this.u = u;
			this.v = v;
			this.w = w;
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		private boolean isPrintable(int ch) {
			return ch >= '!' && ch <= '~';
		}

		private boolean isCRLF(int ch) {
			return ch == '\n' || ch == '\r' || ch == -1;
		}

		private int nextPrintable() {
			try {
				int ch;
				while (!isPrintable(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}

				return ch;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		String next() {
			try {
				int ch = nextPrintable();
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (isPrintable(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		int nextInt() {
			try {
				// parseInt from Integer.parseInt()
				boolean negative = false;
				int res = 0;
				int limit = -Integer.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Integer.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				int multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		long nextLong() {
			try {
				// parseLong from Long.parseLong()
				boolean negative = false;
				long res = 0;
				long limit = -Long.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Long.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				long multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		float nextFloat() {
			return Float.parseFloat(next());
		}

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

		String nextLine() {
			try {
				int ch;
				while (isCRLF(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (!isCRLF(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new NoSuchElementException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}
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