結果
問題 | No.1094 木登り / Climbing tree |
ユーザー | tenten |
提出日時 | 2023-03-17 12:49:03 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 1,893 ms / 2,000 ms |
コード長 | 3,408 bytes |
コンパイル時間 | 3,677 ms |
コンパイル使用メモリ | 85,120 KB |
実行使用メモリ | 189,148 KB |
最終ジャッジ日時 | 2024-09-18 09:55:47 |
合計ジャッジ時間 | 45,832 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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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 | 47 ms
37,304 KB |
testcase_01 | AC | 1,751 ms
151,616 KB |
testcase_02 | AC | 1,056 ms
189,148 KB |
testcase_03 | AC | 355 ms
63,024 KB |
testcase_04 | AC | 769 ms
99,492 KB |
testcase_05 | AC | 1,266 ms
130,192 KB |
testcase_06 | AC | 826 ms
95,360 KB |
testcase_07 | AC | 1,665 ms
171,076 KB |
testcase_08 | AC | 1,725 ms
171,864 KB |
testcase_09 | AC | 1,802 ms
172,292 KB |
testcase_10 | AC | 1,680 ms
168,344 KB |
testcase_11 | AC | 1,739 ms
170,068 KB |
testcase_12 | AC | 1,792 ms
169,828 KB |
testcase_13 | AC | 1,893 ms
169,340 KB |
testcase_14 | AC | 1,830 ms
169,908 KB |
testcase_15 | AC | 643 ms
98,680 KB |
testcase_16 | AC | 1,360 ms
172,136 KB |
testcase_17 | AC | 976 ms
133,832 KB |
testcase_18 | AC | 814 ms
115,296 KB |
testcase_19 | AC | 1,028 ms
154,112 KB |
testcase_20 | AC | 1,737 ms
170,052 KB |
testcase_21 | AC | 1,007 ms
135,684 KB |
testcase_22 | AC | 1,675 ms
172,168 KB |
testcase_23 | AC | 1,671 ms
161,900 KB |
testcase_24 | AC | 1,617 ms
161,456 KB |
testcase_25 | AC | 1,705 ms
161,064 KB |
testcase_26 | AC | 1,630 ms
163,304 KB |
ソースコード
import java.io.*; import java.util.*; import java.util.stream.*; public class Main { static int[] values; static int[] depths; static int[][] parents; static ArrayList<HashMap<Integer, Integer>> graph = new ArrayList<>(); public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); for (int i = 0; i < n; i++) { graph.add(new HashMap<>()); } for (int i = 0; i < n - 1; i++) { int a = sc.nextInt() - 1; int b = sc.nextInt() - 1; int c = sc.nextInt(); graph.get(a).put(b, c); graph.get(b).put(a, c); } values = new int[n]; depths = new int[n]; parents = new int[18][n]; setDepth(0, 0, 0, 0); for (int i = 1; i < 18; i++) { for (int j = 0; j < n; j++) { parents[i][j] = parents[i - 1][parents[i - 1][j]]; } } int q = sc.nextInt(); StringBuilder sb = new StringBuilder(); while (q-- > 0) { int a = sc.nextInt() - 1; int b = sc.nextInt() - 1; int lca = getLCA(a, b); sb.append(values[a] + values[b] - values[lca] * 2).append("\n"); } System.out.print(sb); } static void setDepth(int idx, int p, int d, int v) { parents[0][idx] = p; depths[idx] = d; values[idx] = v; for (int x : graph.get(idx).keySet()) { if (p != x) { setDepth(x, idx, d + 1, v + graph.get(idx).get(x)); } } } static int getLCA(int a, int b) { if (depths[a] < depths[b]) { return getLCA(b, a); } for (int i = 17; i >= 0; i--) { if (depths[a] - depths[b] >= (1 << i)) { a = parents[i][a]; } } if (a == b) { return a; } for (int i = 17; i >= 0; i--) { if (parents[i][a] != parents[i][b]) { a = parents[i][a]; b = parents[i][b]; } } return parents[0][a]; } } 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(); } }