oj.uz

답안 #769325

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
769325 2023-06-29T12:17:24 Z MaGnsi0 경주 (Race) (IOI11_race) C++17
100 / 100
 767 ms 38608 KB 
/**
 *    author:  MaGnsi0
 *    created: 29.06.2023 15:00:05
**/
#include <bits/stdc++.h>

using namespace std;

int K, ans;
map<int, int> cnt;
const int N = 2e5 + 5;
vector<int> length(N), is_centroid(N);
vector<vector<pair<int, int>>> adj(N);

void dfs(int v, int p) {
    length[v] = 1;
    for (auto [u, _] : adj[v]) {
        if (u == p || is_centroid[u]) { continue; }
        dfs(u, v);
        length[v] += length[u];
    }
}

int get_centroid(int v, int p, int m) {
    for (auto [u, _] : adj[v]) {
        if (u == p || is_centroid[u]) { continue; }
        if (2 * length[u] > m) {
            return get_centroid(u, v, m);
        }
    }
    return v;
}

void count(int v, int p, int j, int x) {
    if (x > K) { return; }
    if (cnt.count(K - x)) {
        ans = min(ans, cnt[K - x] + j);
    }
    for (auto [u, w] : adj[v]) {
        if (u == p || is_centroid[u]) { continue; }
        count(u, v, j + 1, x + w);
    }
}

void add(int v, int p, int j, int x) {
    if (x > K) { return; }
    if (cnt.count(x)) {
        cnt[x] = min(cnt[x], j);
    } else {
        cnt[x] = j;
    }
    for (auto [u, w] : adj[v]) {
        if (u == p || is_centroid[u]) { continue; }
        add(u, v, j + 1, x + w);
    }
}

void solve(int v) {
    dfs(v, -1);
    v = get_centroid(v, -1, length[v]);
    is_centroid[v] = 1;
    cnt.clear(); cnt[0] = 0;
    for (auto [u, w] : adj[v]) {
        if (is_centroid[u]) { continue; }
        count(u, v, 1, w); 
        add(u, v, 1, w);
    }
    for (auto [u, w] : adj[v]) {
        if (is_centroid[u]) { continue; }
        solve(u);
    }
}

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

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 3 ms 6484 KB Output is correct
3 Correct 3 ms 6484 KB Output is correct
4 Correct 4 ms 6484 KB Output is correct
5 Correct 3 ms 6484 KB Output is correct
6 Correct 3 ms 6484 KB Output is correct
7 Correct 3 ms 6484 KB Output is correct
8 Correct 3 ms 6484 KB Output is correct
9 Correct 3 ms 6484 KB Output is correct
10 Correct 3 ms 6484 KB Output is correct
11 Correct 3 ms 6484 KB Output is correct
12 Correct 3 ms 6484 KB Output is correct
13 Correct 3 ms 6484 KB Output is correct
14 Correct 3 ms 6484 KB Output is correct
15 Correct 3 ms 6484 KB Output is correct
16 Correct 3 ms 6484 KB Output is correct
17 Correct 3 ms 6484 KB Output is correct
18 Correct 3 ms 6484 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 3 ms 6484 KB Output is correct
3 Correct 3 ms 6484 KB Output is correct
4 Correct 4 ms 6484 KB Output is correct
5 Correct 3 ms 6484 KB Output is correct
6 Correct 3 ms 6484 KB Output is correct
7 Correct 3 ms 6484 KB Output is correct
8 Correct 3 ms 6484 KB Output is correct
9 Correct 3 ms 6484 KB Output is correct
10 Correct 3 ms 6484 KB Output is correct
11 Correct 3 ms 6484 KB Output is correct
12 Correct 3 ms 6484 KB Output is correct
13 Correct 3 ms 6484 KB Output is correct
14 Correct 3 ms 6484 KB Output is correct
15 Correct 3 ms 6484 KB Output is correct
16 Correct 3 ms 6484 KB Output is correct
17 Correct 3 ms 6484 KB Output is correct
18 Correct 3 ms 6484 KB Output is correct
19 Correct 3 ms 6484 KB Output is correct
20 Correct 3 ms 6484 KB Output is correct
21 Correct 4 ms 6612 KB Output is correct
22 Correct 3 ms 6520 KB Output is correct
23 Correct 3 ms 6612 KB Output is correct
24 Correct 3 ms 6612 KB Output is correct
25 Correct 4 ms 6688 KB Output is correct
26 Correct 3 ms 6612 KB Output is correct
27 Correct 3 ms 6612 KB Output is correct
28 Correct 4 ms 6612 KB Output is correct
29 Correct 4 ms 6592 KB Output is correct
30 Correct 4 ms 6612 KB Output is correct
31 Correct 4 ms 6612 KB Output is correct
32 Correct 4 ms 6612 KB Output is correct
33 Correct 4 ms 6612 KB Output is correct
34 Correct 4 ms 6612 KB Output is correct
35 Correct 3 ms 6612 KB Output is correct
36 Correct 4 ms 6612 KB Output is correct
37 Correct 4 ms 6612 KB Output is correct
38 Correct 4 ms 6612 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 3 ms 6484 KB Output is correct
3 Correct 3 ms 6484 KB Output is correct
4 Correct 4 ms 6484 KB Output is correct
5 Correct 3 ms 6484 KB Output is correct
6 Correct 3 ms 6484 KB Output is correct
7 Correct 3 ms 6484 KB Output is correct
8 Correct 3 ms 6484 KB Output is correct
9 Correct 3 ms 6484 KB Output is correct
10 Correct 3 ms 6484 KB Output is correct
11 Correct 3 ms 6484 KB Output is correct
12 Correct 3 ms 6484 KB Output is correct
13 Correct 3 ms 6484 KB Output is correct
14 Correct 3 ms 6484 KB Output is correct
15 Correct 3 ms 6484 KB Output is correct
16 Correct 3 ms 6484 KB Output is correct
17 Correct 3 ms 6484 KB Output is correct
18 Correct 3 ms 6484 KB Output is correct
19 Correct 140 ms 11388 KB Output is correct
20 Correct 141 ms 11320 KB Output is correct
21 Correct 160 ms 11312 KB Output is correct
22 Correct 149 ms 11532 KB Output is correct
23 Correct 63 ms 11592 KB Output is correct
24 Correct 57 ms 11560 KB Output is correct
25 Correct 112 ms 14176 KB Output is correct
26 Correct 80 ms 18472 KB Output is correct
27 Correct 139 ms 19292 KB Output is correct
28 Correct 182 ms 30684 KB Output is correct
29 Correct 195 ms 29844 KB Output is correct
30 Correct 140 ms 19388 KB Output is correct
31 Correct 160 ms 19516 KB Output is correct
32 Correct 156 ms 19492 KB Output is correct
33 Correct 187 ms 18124 KB Output is correct
34 Correct 120 ms 19024 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6484 KB Output is correct
2 Correct 3 ms 6484 KB Output is correct
3 Correct 3 ms 6484 KB Output is correct
4 Correct 4 ms 6484 KB Output is correct
5 Correct 3 ms 6484 KB Output is correct
6 Correct 3 ms 6484 KB Output is correct
7 Correct 3 ms 6484 KB Output is correct
8 Correct 3 ms 6484 KB Output is correct
9 Correct 3 ms 6484 KB Output is correct
10 Correct 3 ms 6484 KB Output is correct
11 Correct 3 ms 6484 KB Output is correct
12 Correct 3 ms 6484 KB Output is correct
13 Correct 3 ms 6484 KB Output is correct
14 Correct 3 ms 6484 KB Output is correct
15 Correct 3 ms 6484 KB Output is correct
16 Correct 3 ms 6484 KB Output is correct
17 Correct 3 ms 6484 KB Output is correct
18 Correct 3 ms 6484 KB Output is correct
19 Correct 3 ms 6484 KB Output is correct
20 Correct 3 ms 6484 KB Output is correct
21 Correct 4 ms 6612 KB Output is correct
22 Correct 3 ms 6520 KB Output is correct
23 Correct 3 ms 6612 KB Output is correct
24 Correct 3 ms 6612 KB Output is correct
25 Correct 4 ms 6688 KB Output is correct
26 Correct 3 ms 6612 KB Output is correct
27 Correct 3 ms 6612 KB Output is correct
28 Correct 4 ms 6612 KB Output is correct
29 Correct 4 ms 6592 KB Output is correct
30 Correct 4 ms 6612 KB Output is correct
31 Correct 4 ms 6612 KB Output is correct
32 Correct 4 ms 6612 KB Output is correct
33 Correct 4 ms 6612 KB Output is correct
34 Correct 4 ms 6612 KB Output is correct
35 Correct 3 ms 6612 KB Output is correct
36 Correct 4 ms 6612 KB Output is correct
37 Correct 4 ms 6612 KB Output is correct
38 Correct 4 ms 6612 KB Output is correct
39 Correct 140 ms 11388 KB Output is correct
40 Correct 141 ms 11320 KB Output is correct
41 Correct 160 ms 11312 KB Output is correct
42 Correct 149 ms 11532 KB Output is correct
43 Correct 63 ms 11592 KB Output is correct
44 Correct 57 ms 11560 KB Output is correct
45 Correct 112 ms 14176 KB Output is correct
46 Correct 80 ms 18472 KB Output is correct
47 Correct 139 ms 19292 KB Output is correct
48 Correct 182 ms 30684 KB Output is correct
49 Correct 195 ms 29844 KB Output is correct
50 Correct 140 ms 19388 KB Output is correct
51 Correct 160 ms 19516 KB Output is correct
52 Correct 156 ms 19492 KB Output is correct
53 Correct 187 ms 18124 KB Output is correct
54 Correct 120 ms 19024 KB Output is correct
55 Correct 16 ms 7252 KB Output is correct
56 Correct 13 ms 7196 KB Output is correct
57 Correct 118 ms 13004 KB Output is correct
58 Correct 48 ms 12712 KB Output is correct
59 Correct 233 ms 22004 KB Output is correct
60 Correct 687 ms 38608 KB Output is correct
61 Correct 199 ms 19712 KB Output is correct
62 Correct 268 ms 19624 KB Output is correct
63 Correct 258 ms 19648 KB Output is correct
64 Correct 767 ms 24284 KB Output is correct
65 Correct 137 ms 20284 KB Output is correct
66 Correct 415 ms 28056 KB Output is correct
67 Correct 95 ms 20084 KB Output is correct
68 Correct 301 ms 23832 KB Output is correct
69 Correct 317 ms 23856 KB Output is correct
70 Correct 274 ms 23152 KB Output is correct