結果
| 問題 |
No.1442 I-wate Shortest Path Problem
|
| コンテスト | |
| ユーザー |
tenten
|
| 提出日時 | 2021-03-31 10:57:05 |
| 言語 | Java (openjdk 23) |
| 結果 |
TLE
(最新)
AC
(最初)
|
| 実行時間 | - |
| コード長 | 3,915 bytes |
| コンパイル時間 | 2,726 ms |
| コンパイル使用メモリ | 80,788 KB |
| 実行使用メモリ | 146,148 KB |
| 最終ジャッジ日時 | 2024-12-14 13:49:35 |
| 合計ジャッジ時間 | 44,368 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 21 TLE * 4 |
ソースコード
import java.util.*;
import java.io.*;
public class Main {
static ArrayList<HashMap<Integer, Integer>> graph = new ArrayList<>();
static int[] depths;
static int[][] parents;
static long[] totals;
public static void main (String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String[] first = br.readLine().split(" ", 2);
int n = Integer.parseInt(first[0]);
int k = Integer.parseInt(first[1]);
for (int i = 0; i < n + k; i++) {
graph.add(new HashMap<>());
}
for (int i = 0; i < n - 1; i++) {
String[] line = br.readLine().split(" ", 3);
int a = Integer.parseInt(line[0]) - 1;
int b = Integer.parseInt(line[1]) - 1;
int c = Integer.parseInt(line[2]);
graph.get(a).put(b, c);
graph.get(b).put(a, c);
}
depths = new int[n];
parents = new int[18][n];
totals = new long[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[] prices = new int[k];
for (int i = 0; i < k; i++) {
String[] line = br.readLine().split(" ", 2);
int m = Integer.parseInt(line[0]);
int p = Integer.parseInt(line[1]);
prices[i] = p;
String[] ports = br.readLine().split(" ", m);
for (int j = 0; j < m; j++) {
int x = Integer.parseInt(ports[j]) - 1;
graph.get(x).put(n + i, p);
graph.get(n + i).put(x, 0);
}
}
PriorityQueue<Path> queue = new PriorityQueue<>();
long[][] costs = new long[k][n + k];
for (int i = 0; i < k; i++) {
Arrays.fill(costs[i], Long.MAX_VALUE);
queue.add(new Path(n + i, 0));
while (queue.size() > 0) {
Path p = queue.poll();
if (costs[i][p.idx] <= p.value) {
continue;
}
costs[i][p.idx] = p.value;
for (int x : graph.get(p.idx).keySet()) {
queue.add(new Path(x, p.value + graph.get(p.idx).get(x)));
}
}
}
int q = Integer.parseInt(br.readLine());
StringBuilder sb = new StringBuilder();
for (int i = 0; i < q; i++) {
String[] line = br.readLine().split(" ", 2);
int left = Integer.parseInt(line[0]) - 1;
int right = Integer.parseInt(line[1]) - 1;
int lca = getLCA(left, right);
long ans = totals[left] + totals[right] - totals[lca] * 2;
for (int j = 0; j < k; j++) {
long tmp = costs[j][left] + costs[j][right] + prices[j];
ans = Math.min(ans, tmp);
}
sb.append(ans).append("\n");
}
System.out.print(sb);
}
static int getLCA(int left, int right) {
if (depths[left] < depths[right]) {
return getLCA(right, left);
}
for (int i = 17; i >= 0; i--) {
if (depths[left] - depths[right] >= (1 << i)) {
left = parents[i][left];
}
}
if (left == right) {
return left;
}
for (int i = 17; i >= 0; i--) {
if (parents[i][left] != parents[i][right]) {
left = parents[i][left];
right = parents[i][right];
}
}
return parents[0][left];
}
static void setDepth(int idx, int p, int d, long c) {
depths[idx] = d;
parents[0][idx] = p;
totals[idx] = c;
for (int x : graph.get(idx).keySet()) {
if (x == p) {
continue;
}
setDepth(x, idx, d + 1, c + graph.get(idx).get(x));
}
}
static class Path implements Comparable<Path> {
int idx;
long value;
public Path(int idx, long value) {
this.idx = idx;
this.value = value;
}
public int compareTo(Path another) {
if (value == another.value) {
return 0;
} else if (value < another.value) {
return -1;
} else {
return 1;
}
}
}
}
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