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 | 310 ms / 2,000 ms |
コード長 | 2,608 bytes |
コンパイル時間 | 3,441 ms |
コンパイル使用メモリ | 92,296 KB |
実行使用メモリ | 76,424 KB |
最終ジャッジ日時 | 2024-11-16 21:48:23 |
合計ジャッジ時間 | 11,205 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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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 | 50 ms
37,092 KB |
testcase_01 | AC | 47 ms
37,248 KB |
testcase_02 | AC | 47 ms
37,236 KB |
testcase_03 | AC | 48 ms
36,968 KB |
testcase_04 | AC | 48 ms
37,096 KB |
testcase_05 | AC | 46 ms
36,620 KB |
testcase_06 | AC | 47 ms
36,892 KB |
testcase_07 | AC | 46 ms
36,896 KB |
testcase_08 | AC | 46 ms
36,904 KB |
testcase_09 | AC | 50 ms
36,956 KB |
testcase_10 | AC | 50 ms
36,512 KB |
testcase_11 | AC | 49 ms
36,968 KB |
testcase_12 | AC | 51 ms
37,036 KB |
testcase_13 | AC | 53 ms
37,052 KB |
testcase_14 | AC | 53 ms
37,152 KB |
testcase_15 | AC | 87 ms
39,880 KB |
testcase_16 | AC | 144 ms
47,844 KB |
testcase_17 | AC | 200 ms
52,440 KB |
testcase_18 | AC | 212 ms
58,416 KB |
testcase_19 | AC | 227 ms
67,416 KB |
testcase_20 | AC | 275 ms
76,076 KB |
testcase_21 | AC | 271 ms
76,076 KB |
testcase_22 | AC | 271 ms
76,152 KB |
testcase_23 | AC | 281 ms
76,244 KB |
testcase_24 | AC | 288 ms
76,156 KB |
testcase_25 | AC | 268 ms
75,960 KB |
testcase_26 | AC | 264 ms
76,352 KB |
testcase_27 | AC | 267 ms
76,116 KB |
testcase_28 | AC | 266 ms
76,192 KB |
testcase_29 | AC | 263 ms
76,372 KB |
testcase_30 | AC | 269 ms
76,424 KB |
testcase_31 | AC | 188 ms
74,400 KB |
testcase_32 | AC | 198 ms
74,360 KB |
testcase_33 | AC | 186 ms
74,252 KB |
testcase_34 | AC | 185 ms
74,260 KB |
testcase_35 | AC | 186 ms
74,264 KB |
testcase_36 | AC | 291 ms
76,012 KB |
testcase_37 | AC | 278 ms
75,948 KB |
testcase_38 | AC | 305 ms
76,072 KB |
testcase_39 | AC | 310 ms
76,076 KB |
testcase_40 | AC | 257 ms
75,384 KB |
testcase_41 | AC | 52 ms
36,972 KB |
testcase_42 | AC | 53 ms
36,892 KB |
testcase_43 | AC | 51 ms
36,484 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(); } }