結果
問題 | No.2530 Yellow Cards |
ユーザー | tenten |
提出日時 | 2023-11-07 15:05:46 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 598 ms / 2,000 ms |
コード長 | 2,438 bytes |
コンパイル時間 | 3,635 ms |
コンパイル使用メモリ | 91,280 KB |
実行使用メモリ | 239,184 KB |
最終ジャッジ日時 | 2024-09-25 23:21:58 |
合計ジャッジ時間 | 9,795 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
(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 | 52 ms
36,924 KB |
testcase_01 | AC | 52 ms
37,032 KB |
testcase_02 | AC | 56 ms
37,292 KB |
testcase_03 | AC | 58 ms
37,244 KB |
testcase_04 | AC | 53 ms
36,672 KB |
testcase_05 | AC | 54 ms
37,412 KB |
testcase_06 | AC | 54 ms
37,156 KB |
testcase_07 | AC | 590 ms
235,928 KB |
testcase_08 | AC | 598 ms
238,896 KB |
testcase_09 | AC | 538 ms
239,004 KB |
testcase_10 | AC | 551 ms
239,184 KB |
testcase_11 | AC | 589 ms
236,920 KB |
testcase_12 | AC | 586 ms
236,936 KB |
testcase_13 | AC | 581 ms
238,412 KB |
testcase_14 | AC | 422 ms
183,680 KB |
testcase_15 | AC | 302 ms
126,428 KB |
testcase_16 | AC | 306 ms
128,608 KB |
testcase_17 | AC | 497 ms
224,772 KB |
testcase_18 | AC | 230 ms
105,344 KB |
testcase_19 | AC | 119 ms
54,340 KB |
testcase_20 | AC | 130 ms
65,476 KB |
ソースコード
import java.io.*;import java.util.*;import java.util.stream.*;public class Main {static final int MOD = 998244353;public static void main(String[] args) throws Exception {Scanner sc = new Scanner();int n = sc.nextInt();int k = sc.nextInt();long div = pow(n, MOD - 2);long[][] dp = new long[k + 1][n + 1];dp[0][0] = 1;for (int i = 1; i <= k; i++) {for (int j = 0; j <= n; j++) {if (j > 0) {dp[i][j - 1] += dp[i - 1][j] * j % MOD * div % MOD;dp[i][j - 1] %= MOD;}if (j < n) {dp[i][j + 1] += dp[i - 1][j] * (n - j) % MOD * div % MOD;}}}long ans = 0;for (int i = 0; i <= n && i <= k; i++) {ans += (n + (k - i) / 2) * dp[k][i] % MOD;ans %= MOD;}System.out.println(ans);}static long pow(long x, long p) {if (p == 0) {return 1;} else if (p % 2 == 0) {return pow(x * x % MOD, p / 2);} else {return pow(x, p - 1) * x % MOD;}}}class Utilities {static String arrayToLineString(Object[] arr) {return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));}static String arrayToLineString(int[] arr) {return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));}}class Scanner {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));StringTokenizer st = new StringTokenizer("");StringBuilder sb = new StringBuilder();public Scanner() throws Exception {}public int nextInt() throws Exception {return Integer.parseInt(next());}public long nextLong() throws Exception {return Long.parseLong(next());}public double nextDouble() throws Exception {return Double.parseDouble(next());}public int[] nextIntArray() throws Exception {return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();}public String next() throws Exception {while (!st.hasMoreTokens()) {st = new StringTokenizer(br.readLine());}return st.nextToken();}}