結果

問題 No.2130 分配方法の数え上げ mod 998244353
ユーザー hiromi_ayasehiromi_ayase
提出日時 2022-11-25 21:48:30
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 3,409 bytes
コンパイル時間 2,538 ms
コンパイル使用メモリ 83,224 KB
実行使用メモリ 38,560 KB
最終ジャッジ日時 2024-10-02 04:24:06
合計ジャッジ時間 6,237 ms
ジャッジサーバーID
(参考情報)
judge3 / 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 73 ms
38,052 KB
testcase_01 AC 73 ms
38,432 KB
testcase_02 AC 75 ms
38,344 KB
testcase_03 AC 73 ms
38,016 KB
testcase_04 AC 73 ms
38,112 KB
testcase_05 AC 72 ms
38,364 KB
testcase_06 AC 72 ms
38,256 KB
testcase_07 AC 71 ms
38,104 KB
testcase_08 AC 73 ms
37,944 KB
testcase_09 AC 74 ms
38,140 KB
testcase_10 AC 74 ms
38,140 KB
testcase_11 AC 77 ms
38,364 KB
testcase_12 AC 77 ms
38,380 KB
testcase_13 AC 78 ms
38,176 KB
testcase_14 AC 78 ms
37,944 KB
testcase_15 AC 77 ms
38,172 KB
testcase_16 AC 79 ms
38,052 KB
testcase_17 AC 78 ms
38,560 KB
testcase_18 AC 79 ms
38,384 KB
testcase_19 AC 82 ms
38,320 KB
testcase_20 AC 72 ms
38,212 KB
testcase_21 WA -
testcase_22 WA -
testcase_23 WA -
testcase_24 WA -
testcase_25 WA -
testcase_26 WA -
testcase_27 WA -
testcase_28 WA -
testcase_29 WA -
testcase_30 AC 69 ms
38,432 KB
testcase_31 AC 69 ms
38,104 KB
testcase_32 AC 71 ms
38,188 KB
testcase_33 AC 73 ms
37,992 KB
testcase_34 WA -
testcase_35 WA -
testcase_36 WA -
testcase_37 WA -
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ソースコード

diff #

import java.util.*;

@SuppressWarnings("unused")
public class Main {

  private static void solve() {
    long n = ni();
    int m = ni();
    int mod = 998244353;

    if (n < m) {
      System.out.println(0);
      return;
    }

    long ret = pow(2, n, mod);;
    // nCm + nCm+1 + nCm+2 ...
    // = 2^n - nC0 - nC1 - .. - nCm-1

    long x = 1;
    for (int i = 0; i < m; i ++) {
      ret = (ret + mod - x) % mod;

      x *= (n + mod - i) % mod;
      x %= mod;
      x *= inv(i + 1, mod);
      x %= mod;
    }

    System.out.println(ret);
  }

  public static long inv(long a, int p) {
      long ret = 1;
      long mul = a;
      for (long n = p - 2; n > 0; n >>>= 1) {
          if ((n & 1) == 1)
              ret = ret * mul % p;
          mul = mul * mul % p;
      }
      return ret;
  }

  public static long pow(long x, long n, long m) {
      assert (n >= 0 && m >= 1);
      long ans = 1;
      while (n > 0) {
          if (n % 2 == 1)
              ans = (ans * x) % m;
          x = (x * x) % m;
          n /= 2;
      }
      return ans;
  }

  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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