結果
問題 | No.196 典型DP (1) |
ユーザー | tenten |
提出日時 | 2023-08-10 15:08:53 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 325 ms / 2,000 ms |
コード長 | 2,608 bytes |
コンパイル時間 | 3,048 ms |
コンパイル使用メモリ | 91,636 KB |
実行使用メモリ | 76,436 KB |
最終ジャッジ日時 | 2024-04-28 08:08:09 |
合計ジャッジ時間 | 11,694 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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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 | 54 ms
36,940 KB |
testcase_01 | AC | 53 ms
37,140 KB |
testcase_02 | AC | 52 ms
36,964 KB |
testcase_03 | AC | 52 ms
37,188 KB |
testcase_04 | AC | 52 ms
36,784 KB |
testcase_05 | AC | 52 ms
36,644 KB |
testcase_06 | AC | 52 ms
36,688 KB |
testcase_07 | AC | 51 ms
36,592 KB |
testcase_08 | AC | 52 ms
36,792 KB |
testcase_09 | AC | 54 ms
36,544 KB |
testcase_10 | AC | 54 ms
36,396 KB |
testcase_11 | AC | 53 ms
36,940 KB |
testcase_12 | AC | 53 ms
37,148 KB |
testcase_13 | AC | 55 ms
36,672 KB |
testcase_14 | AC | 54 ms
36,912 KB |
testcase_15 | AC | 74 ms
38,448 KB |
testcase_16 | AC | 145 ms
47,056 KB |
testcase_17 | AC | 212 ms
52,336 KB |
testcase_18 | AC | 246 ms
57,980 KB |
testcase_19 | AC | 239 ms
67,344 KB |
testcase_20 | AC | 272 ms
76,140 KB |
testcase_21 | AC | 271 ms
75,852 KB |
testcase_22 | AC | 271 ms
75,864 KB |
testcase_23 | AC | 281 ms
75,836 KB |
testcase_24 | AC | 295 ms
75,972 KB |
testcase_25 | AC | 275 ms
75,816 KB |
testcase_26 | AC | 273 ms
76,024 KB |
testcase_27 | AC | 281 ms
76,292 KB |
testcase_28 | AC | 271 ms
76,436 KB |
testcase_29 | AC | 270 ms
76,180 KB |
testcase_30 | AC | 271 ms
76,024 KB |
testcase_31 | AC | 186 ms
74,072 KB |
testcase_32 | AC | 187 ms
74,408 KB |
testcase_33 | AC | 188 ms
73,984 KB |
testcase_34 | AC | 186 ms
73,888 KB |
testcase_35 | AC | 189 ms
74,028 KB |
testcase_36 | AC | 325 ms
76,056 KB |
testcase_37 | AC | 303 ms
75,740 KB |
testcase_38 | AC | 272 ms
75,860 KB |
testcase_39 | AC | 287 ms
75,760 KB |
testcase_40 | AC | 265 ms
75,096 KB |
testcase_41 | AC | 50 ms
37,144 KB |
testcase_42 | AC | 52 ms
36,964 KB |
testcase_43 | AC | 52 ms
36,712 KB |
ソースコード
import java.io.*; import java.util.*; import java.util.stream.*; public class Main { static ArrayList<ArrayList<Integer>> graph = new ArrayList<>(); static long[][] ans; static int[] counts; static final int MOD = 1000000007; public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); int k = sc.nextInt(); for (int i = 0; i < n; i++) { graph.add(new ArrayList<>()); } for (int i = 0; i < n - 1; i++) { int a = sc.nextInt(); int b = sc.nextInt(); graph.get(a).add(b); graph.get(b).add(a); } counts = new int[n]; ans = new long[n][n + 1]; getCount(0, 0); System.out.println(ans[0][k]); } static void getCount(int idx, int p) { ans[idx][0] = 1; for (int x : graph.get(idx)) { if (x == p) { continue; } getCount(x, idx); for (int i = counts[idx]; i >= 0; i--) { for (int j = counts[x]; j >= 1; j--) { ans[idx][i + j] += ans[idx][i] * ans[x][j] % MOD; ans[idx][i + j] %= MOD; } } counts[idx] += counts[x]; } counts[idx]++; ans[idx][counts[idx]] = 1; } } 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(); } }