結果

問題 No.947 ABC包囲網
ユーザー hiromi_ayasehiromi_ayase
提出日時 2019-12-12 04:51:40
言語 Java21
(openjdk 21)
結果
AC  
実行時間 541 ms / 2,000 ms
コード長 3,451 bytes
コンパイル時間 3,130 ms
コンパイル使用メモリ 89,588 KB
実行使用メモリ 53,856 KB
最終ジャッジ日時 2024-06-24 08:33:02
合計ジャッジ時間 19,960 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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 80 ms
51,048 KB
testcase_01 AC 78 ms
51,548 KB
testcase_02 AC 79 ms
51,452 KB
testcase_03 AC 79 ms
51,184 KB
testcase_04 AC 79 ms
51,300 KB
testcase_05 AC 79 ms
51,304 KB
testcase_06 AC 79 ms
51,172 KB
testcase_07 AC 79 ms
51,236 KB
testcase_08 AC 80 ms
51,468 KB
testcase_09 AC 79 ms
51,348 KB
testcase_10 AC 78 ms
51,344 KB
testcase_11 AC 79 ms
51,048 KB
testcase_12 AC 81 ms
51,256 KB
testcase_13 AC 77 ms
51,504 KB
testcase_14 AC 81 ms
51,520 KB
testcase_15 AC 97 ms
52,176 KB
testcase_16 AC 98 ms
52,380 KB
testcase_17 AC 98 ms
52,080 KB
testcase_18 AC 101 ms
52,180 KB
testcase_19 AC 99 ms
51,956 KB
testcase_20 AC 101 ms
52,176 KB
testcase_21 AC 101 ms
52,332 KB
testcase_22 AC 100 ms
52,044 KB
testcase_23 AC 100 ms
52,304 KB
testcase_24 AC 100 ms
52,292 KB
testcase_25 AC 104 ms
52,260 KB
testcase_26 AC 105 ms
52,000 KB
testcase_27 AC 101 ms
52,100 KB
testcase_28 AC 492 ms
53,536 KB
testcase_29 AC 526 ms
53,836 KB
testcase_30 AC 539 ms
53,304 KB
testcase_31 AC 530 ms
53,772 KB
testcase_32 AC 532 ms
53,524 KB
testcase_33 AC 533 ms
53,440 KB
testcase_34 AC 523 ms
53,832 KB
testcase_35 AC 513 ms
53,696 KB
testcase_36 AC 531 ms
53,568 KB
testcase_37 AC 527 ms
53,340 KB
testcase_38 AC 536 ms
53,768 KB
testcase_39 AC 527 ms
53,576 KB
testcase_40 AC 515 ms
53,460 KB
testcase_41 AC 512 ms
53,676 KB
testcase_42 AC 521 ms
53,352 KB
testcase_43 AC 528 ms
53,536 KB
testcase_44 AC 523 ms
53,732 KB
testcase_45 AC 521 ms
53,696 KB
testcase_46 AC 510 ms
53,612 KB
testcase_47 AC 541 ms
53,856 KB
testcase_48 AC 536 ms
53,492 KB
testcase_49 AC 528 ms
53,800 KB
testcase_50 AC 508 ms
53,308 KB
testcase_51 AC 89 ms
51,688 KB
testcase_52 AC 88 ms
51,560 KB
testcase_53 AC 88 ms
51,872 KB
testcase_54 AC 79 ms
51,348 KB
testcase_55 AC 79 ms
51,520 KB
testcase_56 AC 78 ms
51,100 KB
testcase_57 AC 99 ms
52,000 KB
testcase_58 AC 96 ms
52,180 KB
testcase_59 AC 99 ms
52,004 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.util.Arrays;

public class Main {

  private static void solve() {
    int n = ni();
    int[][] p = ntable(n, 2);

    double[] theta1 = new double[n];
    double[] theta2 = new double[n];
    for (int i = 0; i < n; i++) {
      theta1[i] = theta2[i] = Math.atan2(p[i][1], p[i][0]) + Math.PI;
      theta2[i] += Math.PI * 2;

    }

    Arrays.sort(theta1);
    Arrays.sort(theta2);
    long ret = 0;

    double eps = 0.000000000001;
    for (int i = 0; i < n; i++) {
      for (int j = i + 1; j < n; j++) {
        double s = theta1[i];
        double t = theta1[j];

        if (t - s + eps >= Math.PI) {
          break;
        }
        int x = lowerBound(theta2, Math.PI + s + eps, i);
        int y = lowerBound(theta2, Math.PI + t - eps, i);
        ret += Math.max(0, y - x);

      }
    }
    System.out.println(ret);
  }

  public static int lowerBound(double[] a, double v, int to) {
    int low = -1, high = to;
    while (high - low > 1) {
      int h = high + low >>> 1;
      if (a[h] >= v) {
        high = h;
      } else {
        low = h;
      }
    }
    return high;
  }

  public static void main(String[] args) {
    new Thread(null, new Runnable() {
      @Override
      public void run() {
        long start = System.currentTimeMillis();
        String debug = args.length > 0 ? args[0] : null;
        if (debug != null) {
          try {
            is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug));
          } catch (Exception e) {
            throw new RuntimeException(e);
          }
        }
        reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);
        solve();
        out.flush();
        tr((System.currentTimeMillis() - start) + "ms");
      }
    }, "", 64000000).start();
  }

  private static java.io.InputStream is = System.in;
  private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);
  private static java.util.StringTokenizer tokenizer = null;
  private static java.io.BufferedReader reader;

  public static String next() {
    while (tokenizer == null || !tokenizer.hasMoreTokens()) {
      try {
        tokenizer = new java.util.StringTokenizer(reader.readLine());
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
    return tokenizer.nextToken();
  }

  private static double nd() {
    return Double.parseDouble(next());
  }

  private static long nl() {
    return Long.parseLong(next());
  }

  private static int[] na(int n) {
    int[] a = new int[n];
    for (int i = 0; i < n; i++)
      a[i] = ni();
    return a;
  }

  private static char[] ns() {
    return next().toCharArray();
  }

  private static long[] nal(int n) {
    long[] a = new long[n];
    for (int i = 0; i < n; i++)
      a[i] = nl();
    return a;
  }

  private static int[][] ntable(int n, int m) {
    int[][] table = new int[n][m];
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        table[i][j] = ni();
      }
    }
    return table;
  }

  private static int[][] nlist(int n, int m) {
    int[][] table = new int[m][n];
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        table[j][i] = ni();
      }
    }
    return table;
  }

  private static int ni() {
    return Integer.parseInt(next());
  }

  private static void tr(Object... o) {
    if (is != System.in)
      System.out.println(java.util.Arrays.deepToString(o));
  }
}
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