結果

問題 No.1488 Max Score of the Tree
ユーザー tenten
提出日時 2023-03-24 09:18:29
言語 Java
(openjdk 23)
結果
TLE  
実行時間 -
コード長 2,972 bytes
コンパイル時間 2,815 ms
コンパイル使用メモリ 85,432 KB
実行使用メモリ 377,140 KB
最終ジャッジ日時 2024-09-18 15:55:50
合計ジャッジ時間 11,632 ms
ジャッジサーバーID
(参考情報)
judge2 / judge4
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample -- * 3
other AC * 1 TLE * 2 -- * 26
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

import java.io.*;
import java.util.*;
import java.util.stream.*;
public class Main {
static int[] values;
static long[] counts;
static ArrayList<HashMap<Integer, Integer>> graph = new ArrayList<>();
static ArrayList<HashMap<Integer, Long>> dp = new ArrayList<>();
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 HashMap<>());
dp.add(new HashMap<>());
}
values = new int[n - 1];
for (int i = 0; i < n - 1; i ++) {
int a = sc.nextInt() - 1;
int b = sc.nextInt() - 1;
values[i] = sc.nextInt();
graph.get(a).put(b, i);
graph.get(b).put(a, i);
}
counts = new long[n - 1];
getCount(0, 0);
System.out.println(dfw(n - 2, k));
}
static long getCount(int idx, int p) {
long count = 0;
for (int x : graph.get(idx).keySet()) {
if (x == p) {
continue;
}
long tmp = getCount(x, idx);
counts[graph.get(idx).get(x)] = tmp;
count += tmp;
}
if (count == 0) {
count++;
}
return count;
}
static long dfw(int idx, int v) {
if (v < 0) {
return Long.MIN_VALUE;
}
if (idx < 0) {
return 0;
}
if (!dp.get(idx).containsKey(v)) {
dp.get(idx).put(v, Math.max(dfw(idx - 1, v) + values[idx] * counts[idx], dfw(idx - 1, v - values[idx]) + values[idx] * counts[idx] * 2));
}
return dp.get(idx).get(v);
}
}
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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