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답안 #491430

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
491430 2021-12-02T04:08:16 Z FireGhost1301 경주 (Race) (IOI11_race) C++17
100 / 100
 449 ms 31320 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 2e5 + 3;
int n, k;
vector<pair<int, int>> g[N];
bool vst[N];
int sz[N], min_edge[5 * N], ans = N;
vector<int> tmp;

int get_sz(int u, int p) {
    sz[u] = 1;
    for (auto [v, w]: g[u]) if (v != p && !vst[v])
        sz[u] += get_sz(v, u);
    return sz[u];
}

int centroid(int u, int p, int csz) {
    for (auto [v, w]: g[u]) if (v != p && !vst[v]) {
        if (sz[v] > csz / 2) return centroid(v, u, csz);
    }
    return u;
}

void dfs(int u, int p, int cur_len, int cnt, bool get_ans) {
    if (cur_len > k) return;
    if (get_ans) ans = min(ans, cnt + min_edge[k - cur_len]);
    else {
        tmp.push_back(cur_len);
        min_edge[cur_len] = min(min_edge[cur_len], cnt);
    }
    for (auto [v, w]: g[u]) if (v != p && !vst[v])
        dfs(v, u, cur_len + w, cnt + 1, get_ans);
}

void build_cd(int u) {
    u = centroid(u, 0, get_sz(u, 0));
    vst[u] = true;
    for (auto [v, w]: g[u]) if (!vst[v]) {
        dfs(v, u, w, 1, 1);
        dfs(v, u, w, 1, 0);
    }
    ans = min(ans, min_edge[k]);
    while (!tmp.empty()) {
        min_edge[tmp.back()] = N;
        tmp.pop_back();
    }
    for (auto [v, w]: g[u]) if (!vst[v])
        build_cd(v);
}

int solve() {
    for (int i = 0; i < 5 * N; ++i)
        min_edge[i] = N;
    build_cd(1);
    return (ans != N ? ans : -1);
}

int best_path(int N, int K, int H[][2], int L[]) {
    n = N, k = K;
    for (int i = 0; i < N - 1; ++i) {
        g[H[i][0] + 1].emplace_back(H[i][1] + 1, L[i]);
        g[H[i][1] + 1].emplace_back(H[i][0] + 1, L[i]);
    }
    return solve();
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8908 KB Output is correct
2 Correct 4 ms 8908 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 4 ms 8868 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 4 ms 8908 KB Output is correct
7 Correct 4 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 4 ms 8908 KB Output is correct
10 Correct 5 ms 8940 KB Output is correct
11 Correct 4 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 4 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 4 ms 8908 KB Output is correct
16 Correct 4 ms 8840 KB Output is correct
17 Correct 4 ms 8908 KB Output is correct
18 Correct 4 ms 8908 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8908 KB Output is correct
2 Correct 4 ms 8908 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 4 ms 8868 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 4 ms 8908 KB Output is correct
7 Correct 4 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 4 ms 8908 KB Output is correct
10 Correct 5 ms 8940 KB Output is correct
11 Correct 4 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 4 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 4 ms 8908 KB Output is correct
16 Correct 4 ms 8840 KB Output is correct
17 Correct 4 ms 8908 KB Output is correct
18 Correct 4 ms 8908 KB Output is correct
19 Correct 6 ms 8908 KB Output is correct
20 Correct 5 ms 8908 KB Output is correct
21 Correct 5 ms 8908 KB Output is correct
22 Correct 5 ms 8908 KB Output is correct
23 Correct 5 ms 8908 KB Output is correct
24 Correct 5 ms 8908 KB Output is correct
25 Correct 5 ms 8908 KB Output is correct
26 Correct 6 ms 8908 KB Output is correct
27 Correct 5 ms 8908 KB Output is correct
28 Correct 5 ms 8908 KB Output is correct
29 Correct 6 ms 8908 KB Output is correct
30 Correct 5 ms 8908 KB Output is correct
31 Correct 5 ms 8952 KB Output is correct
32 Correct 5 ms 8908 KB Output is correct
33 Correct 5 ms 8908 KB Output is correct
34 Correct 5 ms 8908 KB Output is correct
35 Correct 6 ms 9036 KB Output is correct
36 Correct 5 ms 8992 KB Output is correct
37 Correct 5 ms 8908 KB Output is correct
38 Correct 5 ms 8908 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8908 KB Output is correct
2 Correct 4 ms 8908 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 4 ms 8868 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 4 ms 8908 KB Output is correct
7 Correct 4 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 4 ms 8908 KB Output is correct
10 Correct 5 ms 8940 KB Output is correct
11 Correct 4 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 4 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 4 ms 8908 KB Output is correct
16 Correct 4 ms 8840 KB Output is correct
17 Correct 4 ms 8908 KB Output is correct
18 Correct 4 ms 8908 KB Output is correct
19 Correct 136 ms 14260 KB Output is correct
20 Correct 126 ms 14276 KB Output is correct
21 Correct 117 ms 14532 KB Output is correct
22 Correct 108 ms 14848 KB Output is correct
23 Correct 77 ms 14400 KB Output is correct
24 Correct 55 ms 14364 KB Output is correct
25 Correct 108 ms 17028 KB Output is correct
26 Correct 97 ms 20520 KB Output is correct
27 Correct 155 ms 19780 KB Output is correct
28 Correct 234 ms 30892 KB Output is correct
29 Correct 241 ms 30048 KB Output is correct
30 Correct 146 ms 19832 KB Output is correct
31 Correct 155 ms 19752 KB Output is correct
32 Correct 192 ms 19764 KB Output is correct
33 Correct 192 ms 18712 KB Output is correct
34 Correct 172 ms 18556 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8908 KB Output is correct
2 Correct 4 ms 8908 KB Output is correct
3 Correct 5 ms 8908 KB Output is correct
4 Correct 4 ms 8868 KB Output is correct
5 Correct 5 ms 8908 KB Output is correct
6 Correct 4 ms 8908 KB Output is correct
7 Correct 4 ms 8908 KB Output is correct
8 Correct 5 ms 8908 KB Output is correct
9 Correct 4 ms 8908 KB Output is correct
10 Correct 5 ms 8940 KB Output is correct
11 Correct 4 ms 8908 KB Output is correct
12 Correct 5 ms 8908 KB Output is correct
13 Correct 4 ms 8908 KB Output is correct
14 Correct 5 ms 8908 KB Output is correct
15 Correct 4 ms 8908 KB Output is correct
16 Correct 4 ms 8840 KB Output is correct
17 Correct 4 ms 8908 KB Output is correct
18 Correct 4 ms 8908 KB Output is correct
19 Correct 6 ms 8908 KB Output is correct
20 Correct 5 ms 8908 KB Output is correct
21 Correct 5 ms 8908 KB Output is correct
22 Correct 5 ms 8908 KB Output is correct
23 Correct 5 ms 8908 KB Output is correct
24 Correct 5 ms 8908 KB Output is correct
25 Correct 5 ms 8908 KB Output is correct
26 Correct 6 ms 8908 KB Output is correct
27 Correct 5 ms 8908 KB Output is correct
28 Correct 5 ms 8908 KB Output is correct
29 Correct 6 ms 8908 KB Output is correct
30 Correct 5 ms 8908 KB Output is correct
31 Correct 5 ms 8952 KB Output is correct
32 Correct 5 ms 8908 KB Output is correct
33 Correct 5 ms 8908 KB Output is correct
34 Correct 5 ms 8908 KB Output is correct
35 Correct 6 ms 9036 KB Output is correct
36 Correct 5 ms 8992 KB Output is correct
37 Correct 5 ms 8908 KB Output is correct
38 Correct 5 ms 8908 KB Output is correct
39 Correct 136 ms 14260 KB Output is correct
40 Correct 126 ms 14276 KB Output is correct
41 Correct 117 ms 14532 KB Output is correct
42 Correct 108 ms 14848 KB Output is correct
43 Correct 77 ms 14400 KB Output is correct
44 Correct 55 ms 14364 KB Output is correct
45 Correct 108 ms 17028 KB Output is correct
46 Correct 97 ms 20520 KB Output is correct
47 Correct 155 ms 19780 KB Output is correct
48 Correct 234 ms 30892 KB Output is correct
49 Correct 241 ms 30048 KB Output is correct
50 Correct 146 ms 19832 KB Output is correct
51 Correct 155 ms 19752 KB Output is correct
52 Correct 192 ms 19764 KB Output is correct
53 Correct 192 ms 18712 KB Output is correct
54 Correct 172 ms 18556 KB Output is correct
55 Correct 11 ms 9420 KB Output is correct
56 Correct 13 ms 9548 KB Output is correct
57 Correct 82 ms 15044 KB Output is correct
58 Correct 34 ms 15288 KB Output is correct
59 Correct 92 ms 20484 KB Output is correct
60 Correct 449 ms 31320 KB Output is correct
61 Correct 164 ms 20040 KB Output is correct
62 Correct 175 ms 20680 KB Output is correct
63 Correct 244 ms 20680 KB Output is correct
64 Correct 427 ms 20456 KB Output is correct
65 Correct 199 ms 19780 KB Output is correct
66 Correct 323 ms 27976 KB Output is correct
67 Correct 119 ms 21808 KB Output is correct
68 Correct 238 ms 20412 KB Output is correct
69 Correct 225 ms 20420 KB Output is correct
70 Correct 207 ms 19904 KB Output is correct