oj.uz

답안 #901600

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
901600 2024-01-09T16:27:01 Z aminjonshermatov 경주 (Race) (IOI11_race) C++17
100 / 100
 555 ms 47952 KB 
#include <bits/stdc++.h>

#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...) 42
#include "race.h"
#endif

int best_path(int n, int k, int H[][2], int L[]) {
  std::vector<std::vector<std::pair<int, int>>> g(n);
  for (int i = 0; i + 1 < n; ++i) {
    g[H[i][0]].emplace_back(H[i][1], L[i]);
    g[H[i][1]].emplace_back(H[i][0], L[i]);
  }

  std::vector<int> size(n);
  std::vector<bool> died(n, false);
  auto dfs_sz = [&](auto& f, int v, int p) -> int {
    size[v] = 1;
    for (auto [u, _] : g[v]) {
      if (u != p && !died[u]) {
        size[v] += f(f, u, v);
      }
    }
    return size[v];
  };
  auto centroid = [&](auto& f, int v, int p, int desired) -> int {
    for (auto [u, _] : g[v]) {
      if (u != p && !died[u] && size[u] >= desired) {
        return f(f, u, v, desired);
      }
    }
    return v;
  };
  constexpr auto inf = std::numeric_limits<int>::max() / 2;
  std::vector<int> min_cnt(k + 1, inf);
  auto dfs_calc = [&](auto& f, int v, int p, int tot_w, int cnt, bool do_update, std::set<int>& touched) -> int {
    auto loc = inf;
    if (tot_w > k) {
      return loc;
    }
    if (do_update) {
      min_cnt[tot_w] = std::min(min_cnt[tot_w], cnt);
      touched.emplace(tot_w);
    } else {
      loc = std::min(loc, cnt + min_cnt[k - tot_w]);
    }
    for (auto [u, w] : g[v]) {
      if (u != p && !died[u]) {
        loc = std::min(loc, f(f, u, v, tot_w + w, cnt + 1, do_update, touched));
      }
    }
    return loc;
  };
  auto CD = [&](auto& f, int v, int p) -> int {
    auto c = centroid(centroid, v, p, dfs_sz(dfs_sz, v, p) / 2);
    died[c] = true;
    auto loc = inf;
    std::set<int> touched;
    for (auto [u, w] : g[c]) {
      if (!died[u]) {
        loc = std::min(loc, dfs_calc(dfs_calc, u, c, w, 1, false, touched));
        assert(dfs_calc(dfs_calc, u, c, w, 1, true, touched) == inf);
      }
    }
    for (auto w : touched) {
      min_cnt[w] = inf;
    }
    for (auto [u, _] : g[c]) {
      if (!died[u]) {
        loc = std::min(loc, f(f, u, c));
      }
    }
    return loc;
  };
  min_cnt[0] = 0;
  auto res = CD(CD, 0, -1);
  return res == inf ? -1 : res;
}

#ifdef LOCAL
void solve() {
  int n, k;
  std::cin >> n >> k;
  int H[n][2], L[n];
  for (int i = 0; i + 1 < n; ++i) {
    std::cin >> H[i][0] >> H[i][1] >> L[i];
  }
  std::cout << best_path(n, k, H, L) << '\n';
}

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(nullptr);

  solve();
}
#endif

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2496 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2444 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2496 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2648 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2496 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2444 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2496 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2648 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 0 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2396 KB Output is correct
22 Correct 2 ms 5980 KB Output is correct
23 Correct 3 ms 5320 KB Output is correct
24 Correct 3 ms 5980 KB Output is correct
25 Correct 3 ms 5832 KB Output is correct
26 Correct 2 ms 3676 KB Output is correct
27 Correct 2 ms 5720 KB Output is correct
28 Correct 2 ms 3420 KB Output is correct
29 Correct 2 ms 3676 KB Output is correct
30 Correct 3 ms 4040 KB Output is correct
31 Correct 4 ms 5212 KB Output is correct
32 Correct 3 ms 5212 KB Output is correct
33 Correct 3 ms 5724 KB Output is correct
34 Correct 2 ms 4700 KB Output is correct
35 Correct 3 ms 5724 KB Output is correct
36 Correct 2 ms 6232 KB Output is correct
37 Correct 2 ms 5724 KB Output is correct
38 Correct 2 ms 4444 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2496 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2444 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2496 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2648 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 123 ms 12500 KB Output is correct
20 Correct 140 ms 12496 KB Output is correct
21 Correct 131 ms 12524 KB Output is correct
22 Correct 121 ms 12624 KB Output is correct
23 Correct 55 ms 12636 KB Output is correct
24 Correct 55 ms 12636 KB Output is correct
25 Correct 106 ms 13904 KB Output is correct
26 Correct 91 ms 15700 KB Output is correct
27 Correct 141 ms 20640 KB Output is correct
28 Correct 159 ms 27380 KB Output is correct
29 Correct 161 ms 26944 KB Output is correct
30 Correct 133 ms 20564 KB Output is correct
31 Correct 164 ms 20536 KB Output is correct
32 Correct 132 ms 20712 KB Output is correct
33 Correct 184 ms 19540 KB Output is correct
34 Correct 142 ms 20300 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2496 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2444 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2496 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2648 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 0 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2396 KB Output is correct
22 Correct 2 ms 5980 KB Output is correct
23 Correct 3 ms 5320 KB Output is correct
24 Correct 3 ms 5980 KB Output is correct
25 Correct 3 ms 5832 KB Output is correct
26 Correct 2 ms 3676 KB Output is correct
27 Correct 2 ms 5720 KB Output is correct
28 Correct 2 ms 3420 KB Output is correct
29 Correct 2 ms 3676 KB Output is correct
30 Correct 3 ms 4040 KB Output is correct
31 Correct 4 ms 5212 KB Output is correct
32 Correct 3 ms 5212 KB Output is correct
33 Correct 3 ms 5724 KB Output is correct
34 Correct 2 ms 4700 KB Output is correct
35 Correct 3 ms 5724 KB Output is correct
36 Correct 2 ms 6232 KB Output is correct
37 Correct 2 ms 5724 KB Output is correct
38 Correct 2 ms 4444 KB Output is correct
39 Correct 123 ms 12500 KB Output is correct
40 Correct 140 ms 12496 KB Output is correct
41 Correct 131 ms 12524 KB Output is correct
42 Correct 121 ms 12624 KB Output is correct
43 Correct 55 ms 12636 KB Output is correct
44 Correct 55 ms 12636 KB Output is correct
45 Correct 106 ms 13904 KB Output is correct
46 Correct 91 ms 15700 KB Output is correct
47 Correct 141 ms 20640 KB Output is correct
48 Correct 159 ms 27380 KB Output is correct
49 Correct 161 ms 26944 KB Output is correct
50 Correct 133 ms 20564 KB Output is correct
51 Correct 164 ms 20536 KB Output is correct
52 Correct 132 ms 20712 KB Output is correct
53 Correct 184 ms 19540 KB Output is correct
54 Correct 142 ms 20300 KB Output is correct
55 Correct 11 ms 3676 KB Output is correct
56 Correct 11 ms 3164 KB Output is correct
57 Correct 88 ms 12712 KB Output is correct
58 Correct 33 ms 12232 KB Output is correct
59 Correct 196 ms 23880 KB Output is correct
60 Correct 501 ms 47952 KB Output is correct
61 Correct 200 ms 20920 KB Output is correct
62 Correct 181 ms 24804 KB Output is correct
63 Correct 219 ms 24656 KB Output is correct
64 Correct 555 ms 34216 KB Output is correct
65 Correct 151 ms 21328 KB Output is correct
66 Correct 381 ms 31356 KB Output is correct
67 Correct 81 ms 25536 KB Output is correct
68 Correct 270 ms 31992 KB Output is correct
69 Correct 270 ms 32340 KB Output is correct
70 Correct 235 ms 31316 KB Output is correct