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답안 #238770

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
238770 2020-06-12T17:41:13 Z Haunted_Cpp 경주 (Race) (IOI11_race) C++17
100 / 100
 772 ms 34016 KB 
#include <bits/stdc++.h>
#include "race.h"

using namespace std;

const int MAX_N = 2e5 + 5;
const int MAX_K = 1e6 + 5;

vector<vector<pair<int,int>>> g (MAX_N);
vector<int> sub(MAX_N), dist(MAX_K, 1e9), del(MAX_N);

int ans = 1e9;

int calc_sub(int node, int p) {
  sub[node] = 1;
  for (auto to : g[node]) {
    if (!del[to.first] && to.first != p) {
      sub[node] += calc_sub(to.first, node);
    }
  }
  return sub[node];
}

int calc_centroid(int node, int p, int tam) {
  for (auto to : g[node]) {
    if (!del[to.first] && to.first != p && sub[to.first] > tam / 2) {
      return calc_centroid(to.first, node, tam);
    }
  }
  return node;
}

int _K;

void change(int node, int p, int w, int t, int type) {
  if (w > _K) return;
  if (type == 0) dist[w] = min (dist[w], t);
  else dist[w] = 1e9;
  for (auto to : g[node]) {
    if (!del[to.first] && to.first != p) {
      change(to.first, node, w + to.second, t + 1, type);
    }
  }
}

void solve(int node, int p, int w, int t) {
  if (w > _K) return;
  ans = min (ans, t + dist[_K - w]);
  for (auto to : g[node]) {
    if (!del[to.first] && to.first != p) {
      solve(to.first, node, w + to.second, t + 1);
    }
  }
}

void decompose(int node = 0) {
  const int centroid = calc_centroid(node, -1, calc_sub(node, -1));
  del[centroid] = true;
  dist[0] = 0;
  for (auto to : g[centroid]) {
    if (del[to.first]) continue;
    solve(to.first, -1, to.second, 1);
    change(to.first, -1, to.second, 1, 0);
  }
  for (auto to : g[centroid]) {
    if (del[to.first]) continue;
    change(to.first, -1, to.second, 1, 1);
  }
  for (auto to : g[centroid]) {
    if (del[to.first]) continue;
    decompose(to.first);
  }
}

int best_path(int N, int K, int H[][2], int L[]) {
  _K = K;
  for (int i = 0; i < N - 1; i++) {
    int st = H[i][0];
    int et = H[i][1];
    int w = L[i];
    g[st].emplace_back(et, w);
    g[et].emplace_back(st, w);
  }
  decompose();
  return (ans > 1e8 ? -1 : ans);
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 10496 KB Output is correct
2 Correct 10 ms 10496 KB Output is correct
3 Correct 12 ms 10624 KB Output is correct
4 Correct 11 ms 10624 KB Output is correct
5 Correct 10 ms 10496 KB Output is correct
6 Correct 10 ms 10496 KB Output is correct
7 Correct 11 ms 10496 KB Output is correct
8 Correct 12 ms 10496 KB Output is correct
9 Correct 11 ms 10496 KB Output is correct
10 Correct 12 ms 10496 KB Output is correct
11 Correct 12 ms 10496 KB Output is correct
12 Correct 11 ms 10496 KB Output is correct
13 Correct 11 ms 10496 KB Output is correct
14 Correct 10 ms 10496 KB Output is correct
15 Correct 10 ms 10496 KB Output is correct
16 Correct 11 ms 10496 KB Output is correct
17 Correct 11 ms 10496 KB Output is correct
18 Correct 10 ms 10496 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 10496 KB Output is correct
2 Correct 10 ms 10496 KB Output is correct
3 Correct 12 ms 10624 KB Output is correct
4 Correct 11 ms 10624 KB Output is correct
5 Correct 10 ms 10496 KB Output is correct
6 Correct 10 ms 10496 KB Output is correct
7 Correct 11 ms 10496 KB Output is correct
8 Correct 12 ms 10496 KB Output is correct
9 Correct 11 ms 10496 KB Output is correct
10 Correct 12 ms 10496 KB Output is correct
11 Correct 12 ms 10496 KB Output is correct
12 Correct 11 ms 10496 KB Output is correct
13 Correct 11 ms 10496 KB Output is correct
14 Correct 10 ms 10496 KB Output is correct
15 Correct 10 ms 10496 KB Output is correct
16 Correct 11 ms 10496 KB Output is correct
17 Correct 11 ms 10496 KB Output is correct
18 Correct 10 ms 10496 KB Output is correct
19 Correct 12 ms 10496 KB Output is correct
20 Correct 11 ms 10496 KB Output is correct
21 Correct 11 ms 10624 KB Output is correct
22 Correct 11 ms 10624 KB Output is correct
23 Correct 13 ms 10624 KB Output is correct
24 Correct 12 ms 10624 KB Output is correct
25 Correct 12 ms 10624 KB Output is correct
26 Correct 12 ms 10624 KB Output is correct
27 Correct 12 ms 10624 KB Output is correct
28 Correct 13 ms 10624 KB Output is correct
29 Correct 11 ms 10624 KB Output is correct
30 Correct 11 ms 10624 KB Output is correct
31 Correct 11 ms 10624 KB Output is correct
32 Correct 12 ms 10624 KB Output is correct
33 Correct 11 ms 10624 KB Output is correct
34 Correct 11 ms 10624 KB Output is correct
35 Correct 11 ms 10624 KB Output is correct
36 Correct 12 ms 10624 KB Output is correct
37 Correct 13 ms 10624 KB Output is correct
38 Correct 12 ms 10624 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 10496 KB Output is correct
2 Correct 10 ms 10496 KB Output is correct
3 Correct 12 ms 10624 KB Output is correct
4 Correct 11 ms 10624 KB Output is correct
5 Correct 10 ms 10496 KB Output is correct
6 Correct 10 ms 10496 KB Output is correct
7 Correct 11 ms 10496 KB Output is correct
8 Correct 12 ms 10496 KB Output is correct
9 Correct 11 ms 10496 KB Output is correct
10 Correct 12 ms 10496 KB Output is correct
11 Correct 12 ms 10496 KB Output is correct
12 Correct 11 ms 10496 KB Output is correct
13 Correct 11 ms 10496 KB Output is correct
14 Correct 10 ms 10496 KB Output is correct
15 Correct 10 ms 10496 KB Output is correct
16 Correct 11 ms 10496 KB Output is correct
17 Correct 11 ms 10496 KB Output is correct
18 Correct 10 ms 10496 KB Output is correct
19 Correct 182 ms 15608 KB Output is correct
20 Correct 175 ms 15480 KB Output is correct
21 Correct 223 ms 15620 KB Output is correct
22 Correct 203 ms 15736 KB Output is correct
23 Correct 106 ms 15780 KB Output is correct
24 Correct 78 ms 15608 KB Output is correct
25 Correct 166 ms 18424 KB Output is correct
26 Correct 135 ms 21368 KB Output is correct
27 Correct 220 ms 20600 KB Output is correct
28 Correct 330 ms 31736 KB Output is correct
29 Correct 349 ms 30944 KB Output is correct
30 Correct 216 ms 20472 KB Output is correct
31 Correct 226 ms 20600 KB Output is correct
32 Correct 251 ms 20600 KB Output is correct
33 Correct 310 ms 19448 KB Output is correct
34 Correct 259 ms 19576 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 10496 KB Output is correct
2 Correct 10 ms 10496 KB Output is correct
3 Correct 12 ms 10624 KB Output is correct
4 Correct 11 ms 10624 KB Output is correct
5 Correct 10 ms 10496 KB Output is correct
6 Correct 10 ms 10496 KB Output is correct
7 Correct 11 ms 10496 KB Output is correct
8 Correct 12 ms 10496 KB Output is correct
9 Correct 11 ms 10496 KB Output is correct
10 Correct 12 ms 10496 KB Output is correct
11 Correct 12 ms 10496 KB Output is correct
12 Correct 11 ms 10496 KB Output is correct
13 Correct 11 ms 10496 KB Output is correct
14 Correct 10 ms 10496 KB Output is correct
15 Correct 10 ms 10496 KB Output is correct
16 Correct 11 ms 10496 KB Output is correct
17 Correct 11 ms 10496 KB Output is correct
18 Correct 10 ms 10496 KB Output is correct
19 Correct 12 ms 10496 KB Output is correct
20 Correct 11 ms 10496 KB Output is correct
21 Correct 11 ms 10624 KB Output is correct
22 Correct 11 ms 10624 KB Output is correct
23 Correct 13 ms 10624 KB Output is correct
24 Correct 12 ms 10624 KB Output is correct
25 Correct 12 ms 10624 KB Output is correct
26 Correct 12 ms 10624 KB Output is correct
27 Correct 12 ms 10624 KB Output is correct
28 Correct 13 ms 10624 KB Output is correct
29 Correct 11 ms 10624 KB Output is correct
30 Correct 11 ms 10624 KB Output is correct
31 Correct 11 ms 10624 KB Output is correct
32 Correct 12 ms 10624 KB Output is correct
33 Correct 11 ms 10624 KB Output is correct
34 Correct 11 ms 10624 KB Output is correct
35 Correct 11 ms 10624 KB Output is correct
36 Correct 12 ms 10624 KB Output is correct
37 Correct 13 ms 10624 KB Output is correct
38 Correct 12 ms 10624 KB Output is correct
39 Correct 182 ms 15608 KB Output is correct
40 Correct 175 ms 15480 KB Output is correct
41 Correct 223 ms 15620 KB Output is correct
42 Correct 203 ms 15736 KB Output is correct
43 Correct 106 ms 15780 KB Output is correct
44 Correct 78 ms 15608 KB Output is correct
45 Correct 166 ms 18424 KB Output is correct
46 Correct 135 ms 21368 KB Output is correct
47 Correct 220 ms 20600 KB Output is correct
48 Correct 330 ms 31736 KB Output is correct
49 Correct 349 ms 30944 KB Output is correct
50 Correct 216 ms 20472 KB Output is correct
51 Correct 226 ms 20600 KB Output is correct
52 Correct 251 ms 20600 KB Output is correct
53 Correct 310 ms 19448 KB Output is correct
54 Correct 259 ms 19576 KB Output is correct
55 Correct 23 ms 11136 KB Output is correct
56 Correct 24 ms 11136 KB Output is correct
57 Correct 109 ms 16888 KB Output is correct
58 Correct 50 ms 16748 KB Output is correct
59 Correct 126 ms 22392 KB Output is correct
60 Correct 772 ms 34016 KB Output is correct
61 Correct 232 ms 23548 KB Output is correct
62 Correct 266 ms 23544 KB Output is correct
63 Correct 356 ms 23416 KB Output is correct
64 Correct 697 ms 23800 KB Output is correct
65 Correct 310 ms 24312 KB Output is correct
66 Correct 503 ms 31864 KB Output is correct
67 Correct 157 ms 24040 KB Output is correct
68 Correct 386 ms 24228 KB Output is correct
69 Correct 344 ms 24312 KB Output is correct
70 Correct 343 ms 23800 KB Output is correct