結果

問題 No.243 出席番号(2)
ユーザー hiromi_ayasehiromi_ayase
提出日時 2019-03-10 10:51:35
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 3,018 bytes
コンパイル時間 2,436 ms
コンパイル使用メモリ 82,576 KB
実行使用メモリ 54,520 KB
最終ジャッジ日時 2024-06-23 15:16:47
合計ジャッジ時間 9,660 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
このコードへのチャレンジ
(要ログイン)

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 77 ms
51,040 KB
testcase_01 AC 78 ms
51,384 KB
testcase_02 AC 77 ms
51,052 KB
testcase_03 AC 119 ms
52,216 KB
testcase_04 AC 117 ms
52,368 KB
testcase_05 AC 121 ms
52,192 KB
testcase_06 AC 115 ms
52,164 KB
testcase_07 WA -
testcase_08 AC 156 ms
52,096 KB
testcase_09 AC 156 ms
52,448 KB
testcase_10 AC 158 ms
52,312 KB
testcase_11 AC 156 ms
52,216 KB
testcase_12 WA -
testcase_13 AC 221 ms
52,308 KB
testcase_14 AC 220 ms
52,236 KB
testcase_15 AC 219 ms
52,348 KB
testcase_16 AC 223 ms
52,396 KB
testcase_17 WA -
testcase_18 AC 308 ms
52,408 KB
testcase_19 AC 310 ms
52,424 KB
testcase_20 AC 308 ms
52,640 KB
testcase_21 AC 306 ms
54,520 KB
testcase_22 WA -
testcase_23 AC 433 ms
52,936 KB
testcase_24 AC 430 ms
52,552 KB
testcase_25 AC 431 ms
52,908 KB
testcase_26 AC 425 ms
52,644 KB
testcase_27 AC 429 ms
52,616 KB
testcase_28 AC 77 ms
51,176 KB
testcase_29 AC 76 ms
51,268 KB
testcase_30 AC 77 ms
50,964 KB
testcase_31 AC 75 ms
51,392 KB
testcase_32 AC 78 ms
51,364 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 #

public class Main {


  private static void solve() {
    int n = ni();
    int[] x = new int[n];
    for (int i = 0; i < n; i++) {
      x[ni()]++;
    }
    int mod = (int) (1e9 + 7);

    long[] f = new long[n + 1];
    f[0] = 1;
    for (int i = 1; i <= n; i++) {
      f[i] = f[i - 1] * i % mod;
    }

    long[] dp = new long[n + 1];
    dp[0] = 1;
    for (int i = 0; i < n; i++) {
      for (int j = n - 1; j >= 0; j--) {
        dp[j+1] += dp[j] * x[i];
        dp[j] %= mod;
      }
    }

    long ret = 0;
    for (int i = 0; i <= n; i++) {
      ret += f[n - i] * dp[i] % mod * (i % 2 == 0 ? 1 : (mod-1));
      ret %= mod;
    }
    System.out.println(ret);
  }

  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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