結果

問題 No.898 tri-βutree
ユーザー tentententen
提出日時 2023-01-10 16:58:32
言語 Java21
(openjdk 21)
結果
AC  
実行時間 1,909 ms / 4,000 ms
コード長 3,656 bytes
コンパイル時間 2,650 ms
コンパイル使用メモリ 86,072 KB
実行使用メモリ 131,036 KB
最終ジャッジ日時 2023-08-23 10:15:10
合計ジャッジ時間 33,540 ms
ジャッジサーバーID
(参考情報)
judge11 / judge15
このコードへのチャレンジ
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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 826 ms
127,212 KB
testcase_01 AC 44 ms
49,208 KB
testcase_02 AC 52 ms
49,604 KB
testcase_03 AC 53 ms
50,692 KB
testcase_04 AC 53 ms
49,232 KB
testcase_05 AC 55 ms
50,268 KB
testcase_06 AC 54 ms
49,776 KB
testcase_07 AC 1,455 ms
129,532 KB
testcase_08 AC 1,304 ms
118,964 KB
testcase_09 AC 1,529 ms
119,644 KB
testcase_10 AC 1,909 ms
128,332 KB
testcase_11 AC 1,387 ms
129,556 KB
testcase_12 AC 1,362 ms
119,536 KB
testcase_13 AC 1,353 ms
119,272 KB
testcase_14 AC 1,359 ms
119,252 KB
testcase_15 AC 1,572 ms
131,036 KB
testcase_16 AC 1,300 ms
121,048 KB
testcase_17 AC 1,541 ms
130,716 KB
testcase_18 AC 1,391 ms
119,992 KB
testcase_19 AC 1,286 ms
119,804 KB
testcase_20 AC 1,846 ms
126,020 KB
testcase_21 AC 1,290 ms
119,464 KB
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ソースコード

diff #

import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static ArrayList<HashMap<Integer, Integer>> graph = new ArrayList<>();
    static int[][] parents;
    static int[] depths;
    static long[] weights;
    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();
            int b = sc.nextInt();
            int c = sc.nextInt();
            graph.get(a).put(b, c);
            graph.get(b).put(a, c);
        }
        parents = new int[18][n];
        depths = new int[n];
        weights = new long[n];
        setDepths(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[] points = new int[3];
            for (int i = 0; i < 3; i++) {
                points[i] = sc.nextInt();
            }
            long ans = 0;
            for (int i = 0; i < 3; i++) {
                int lca = getLCA(points[i], points[(i + 1) % 3]);
                ans += weights[points[i]] + weights[points[(i + 1) % 3]] - weights[lca] * 2;
            }
            sb.append(ans / 2).append("\n");
        }
        System.out.print(sb);
    }
    
    static void setDepths(int idx, int p, int d, long value) {
        parents[0][idx] = p;
        depths[idx] = d;
        weights[idx] = value;
        for (int x : graph.get(idx).keySet()) {
            if (x != p) {
                setDepths(x, idx, d + 1, value + 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();
    }
    
}
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