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답안 #452024

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
452024 2021-08-03T16:18:00 Z palilo 경주 (Race) (IOI11_race) C++17
100 / 100
 526 ms 30136 KB 
#include "race.h"
#include <bits/stdc++.h>
using namespace std;

namespace std {
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0200r0.html
template <class Fun>
class y_combinator_result {
    Fun fun_;

public:
    template <class T>
    explicit y_combinator_result(T&& fun) : fun_(std::forward<T>(fun)) {}

    template <class... Args>
    decltype(auto) operator()(Args&&... args) {
        return fun_(std::ref(*this), std::forward<Args>(args)...);
    }
};

template <class Fun>
decltype(auto) y_combinator(Fun&& fun) {
    return y_combinator_result<std::decay_t<Fun>>(std::forward<Fun>(fun));
}
}; // namespace std

template <class T>
bool chmin(T& _old, T _new) { return _old > _new && (_old = _new, true); }
template <class T>
bool chmax(T& _old, T _new) { return _old < _new && (_old = _new, true); }

int best_path(int n, int k, int e[][2], int w[]) {
    constexpr int INF = 0x3f3f3f3f;
    vector<vector<pair<int, int>>> adj(n);
    for (int i = 0; i < n - 1; ++i) {
        adj[e[i][0]].emplace_back(w[i], e[i][1]);
        adj[e[i][1]].emplace_back(w[i], e[i][0]);
    }
    vector<int> sz(n), dist(n), best(k + 1, INF), checked;
    vector<bool> erased(n);
    vector<pair<int, int>> dists;
    int ans = INF, s;
    auto dfs_sz = y_combinator([&](auto self, int u, int p) -> int {
        sz[u] = 1;
        for (const auto& [w, v] : adj[u]) {
            if (v != p && !erased[v]) {
                sz[u] += self(v, u);
            }
        }
        return sz[u];
    });
    auto dfs_ct = y_combinator([&](auto self, int u, int p) -> int {
        for (const auto& [w, v] : adj[u]) {
            if (v != p && !erased[v] && sz[v] > s / 2) {
                return self(v, u);
            }
        }
        return u;
    });
    auto dfs = y_combinator([&](auto self, int u, int p, int edges) -> void {
        dists.emplace_back(dist[u], edges);
        checked.emplace_back(dist[u]);
        chmin(ans, edges + best[k - dist[u]]);
        for (const auto& [w, v] : adj[u]) {
            if (v != p && !erased[v] && dist[u] + w <= k) {
                dist[v] = dist[u] + w;
                self(v, u, edges + 1);
            }
        }
    });
    y_combinator([&](auto self, int u) -> void {
        s = dfs_sz(u, -1);
        u = dfs_ct(u, -1);
        erased[u] = true;
        for (const auto [w, v] : adj[u]) {
            if (erased[v] || w > k) continue;
            dist[v] = w;
            dfs(v, u, 1);
            for (const auto& [d, e] : dists) {
                chmin(best[d], e);
            }
            dists.clear();
        }
        chmin(ans, best[k]);
        for (const auto& x : checked) {
            best[x] = INF;
        }
        checked.clear();
        for (const auto& [w, v] : adj[u]) {
            if (!erased[v]) {
                self(v);
            }
        }
    })(0);
    return ans == INF ? -1 : ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 304 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 304 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 304 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 304 KB Output is correct
19 Correct 1 ms 296 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 3 ms 3916 KB Output is correct
23 Correct 3 ms 3276 KB Output is correct
24 Correct 3 ms 3788 KB Output is correct
25 Correct 3 ms 3636 KB Output is correct
26 Correct 2 ms 1612 KB Output is correct
27 Correct 3 ms 3532 KB Output is correct
28 Correct 2 ms 1100 KB Output is correct
29 Correct 2 ms 1612 KB Output is correct
30 Correct 2 ms 1740 KB Output is correct
31 Correct 3 ms 2892 KB Output is correct
32 Correct 3 ms 3148 KB Output is correct
33 Correct 3 ms 3404 KB Output is correct
34 Correct 3 ms 2636 KB Output is correct
35 Correct 3 ms 3532 KB Output is correct
36 Correct 3 ms 4044 KB Output is correct
37 Correct 3 ms 3404 KB Output is correct
38 Correct 2 ms 2356 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 304 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 304 KB Output is correct
19 Correct 134 ms 8572 KB Output is correct
20 Correct 138 ms 8516 KB Output is correct
21 Correct 161 ms 8920 KB Output is correct
22 Correct 170 ms 9488 KB Output is correct
23 Correct 87 ms 8696 KB Output is correct
24 Correct 70 ms 8496 KB Output is correct
25 Correct 150 ms 10244 KB Output is correct
26 Correct 133 ms 13376 KB Output is correct
27 Correct 203 ms 16576 KB Output is correct
28 Correct 324 ms 24084 KB Output is correct
29 Correct 316 ms 23456 KB Output is correct
30 Correct 197 ms 16580 KB Output is correct
31 Correct 191 ms 16676 KB Output is correct
32 Correct 246 ms 16692 KB Output is correct
33 Correct 274 ms 15516 KB Output is correct
34 Correct 230 ms 15440 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 304 KB Output is correct
12 Correct 1 ms 304 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 304 KB Output is correct
19 Correct 1 ms 296 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 3 ms 3916 KB Output is correct
23 Correct 3 ms 3276 KB Output is correct
24 Correct 3 ms 3788 KB Output is correct
25 Correct 3 ms 3636 KB Output is correct
26 Correct 2 ms 1612 KB Output is correct
27 Correct 3 ms 3532 KB Output is correct
28 Correct 2 ms 1100 KB Output is correct
29 Correct 2 ms 1612 KB Output is correct
30 Correct 2 ms 1740 KB Output is correct
31 Correct 3 ms 2892 KB Output is correct
32 Correct 3 ms 3148 KB Output is correct
33 Correct 3 ms 3404 KB Output is correct
34 Correct 3 ms 2636 KB Output is correct
35 Correct 3 ms 3532 KB Output is correct
36 Correct 3 ms 4044 KB Output is correct
37 Correct 3 ms 3404 KB Output is correct
38 Correct 2 ms 2356 KB Output is correct
39 Correct 134 ms 8572 KB Output is correct
40 Correct 138 ms 8516 KB Output is correct
41 Correct 161 ms 8920 KB Output is correct
42 Correct 170 ms 9488 KB Output is correct
43 Correct 87 ms 8696 KB Output is correct
44 Correct 70 ms 8496 KB Output is correct
45 Correct 150 ms 10244 KB Output is correct
46 Correct 133 ms 13376 KB Output is correct
47 Correct 203 ms 16576 KB Output is correct
48 Correct 324 ms 24084 KB Output is correct
49 Correct 316 ms 23456 KB Output is correct
50 Correct 197 ms 16580 KB Output is correct
51 Correct 191 ms 16676 KB Output is correct
52 Correct 246 ms 16692 KB Output is correct
53 Correct 274 ms 15516 KB Output is correct
54 Correct 230 ms 15440 KB Output is correct
55 Correct 14 ms 1356 KB Output is correct
56 Correct 11 ms 1356 KB Output is correct
57 Correct 106 ms 9900 KB Output is correct
58 Correct 43 ms 9780 KB Output is correct
59 Correct 126 ms 14320 KB Output is correct
60 Correct 515 ms 30136 KB Output is correct
61 Correct 237 ms 17220 KB Output is correct
62 Correct 235 ms 21872 KB Output is correct
63 Correct 311 ms 21820 KB Output is correct
64 Correct 526 ms 20800 KB Output is correct
65 Correct 260 ms 16708 KB Output is correct
66 Correct 444 ms 26160 KB Output is correct
67 Correct 151 ms 22832 KB Output is correct
68 Correct 294 ms 21344 KB Output is correct
69 Correct 298 ms 21512 KB Output is correct
70 Correct 288 ms 20680 KB Output is correct