oj.uz

답안 #629967

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
629967 2022-08-15T12:53:50 Z bebra 경주 (Race) (IOI11_race) C++17
100 / 100
 451 ms 99732 KB 
#include <bits/stdc++.h>
using namespace std;

#define dbg(x) cerr << #x << ": " << x << endl;

const int MAX_N = 200'000;
const int INF = 1e9;
vector<pair<int, int>> g[MAX_N];
unordered_map<long long, int> s[MAX_N];
int depth[MAX_N];
long long len[MAX_N];
int ans = INF;
int k;

template<typename T>
void merge(T& lhs, T& rhs, int v) {
    if (lhs.size() > rhs.size()) {
        swap(lhs, rhs);
    }
    for (const auto& [curr_len, curr_depth] : lhs) {
        long long need_find = k + 2 * len[v] - curr_len;
        if (rhs.find(need_find) != rhs.end()) {
            ans = min(ans, curr_depth + rhs.at(need_find) - 2 * depth[v]);
        }
    }
    for (const auto& [key, value] : lhs) {
        if (rhs.find(key) == rhs.end()) {
            rhs[key] = value;
        } else {
            rhs[key] = min(rhs[key], value);
        }
    }
}

void dfs(int v = 0, int p = -1) {
    s[v][len[v]] = depth[v];
    for (const auto& [u, weight] : g[v]) {
        if (u != p) {
            depth[u] = depth[v] + 1;
            len[u] = len[v] + weight;
            dfs(u, v);
            merge(s[u], s[v], v);
        }
    }
}

int best_path(int n, int curr_k, int highways[][2], int length[]) {
    for (int i = 0; i < n - 1; ++i) {
        auto [u, v] = highways[i];
        g[u].emplace_back(v, length[i]);
        g[v].emplace_back(u, length[i]);
    }
    k = curr_k;
    dfs();
    if (ans == INF) ans = -1;
    return ans;
}


// int main() {
//     int n;
//     cin >> n;
//     cin >> k;
//     for (int i = 0; i < n - 1; ++i) {
//         int u, v, w;
//         cin >> u >> v >> w;
//         g[u].emplace_back(v, w);
//         g[v].emplace_back(u, w);
//     }
//     dfs();
//     cout << ans << '\n';
// }

/*
4 3
0 1 1
1 2 2
1 3 4

2
*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 15956 KB Output is correct
2 Correct 9 ms 15896 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 8 ms 15960 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 9 ms 15956 KB Output is correct
9 Correct 8 ms 15956 KB Output is correct
10 Correct 8 ms 16004 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 8 ms 15940 KB Output is correct
13 Correct 9 ms 15972 KB Output is correct
14 Correct 9 ms 15980 KB Output is correct
15 Correct 9 ms 15968 KB Output is correct
16 Correct 9 ms 15964 KB Output is correct
17 Correct 9 ms 15956 KB Output is correct
18 Correct 9 ms 16008 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 15956 KB Output is correct
2 Correct 9 ms 15896 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 8 ms 15960 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 9 ms 15956 KB Output is correct
9 Correct 8 ms 15956 KB Output is correct
10 Correct 8 ms 16004 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 8 ms 15940 KB Output is correct
13 Correct 9 ms 15972 KB Output is correct
14 Correct 9 ms 15980 KB Output is correct
15 Correct 9 ms 15968 KB Output is correct
16 Correct 9 ms 15964 KB Output is correct
17 Correct 9 ms 15956 KB Output is correct
18 Correct 9 ms 16008 KB Output is correct
19 Correct 11 ms 15876 KB Output is correct
20 Correct 10 ms 15968 KB Output is correct
21 Correct 9 ms 16212 KB Output is correct
22 Correct 10 ms 16288 KB Output is correct
23 Correct 9 ms 16268 KB Output is correct
24 Correct 9 ms 16308 KB Output is correct
25 Correct 10 ms 16228 KB Output is correct
26 Correct 10 ms 16260 KB Output is correct
27 Correct 10 ms 16216 KB Output is correct
28 Correct 10 ms 16232 KB Output is correct
29 Correct 10 ms 16260 KB Output is correct
30 Correct 11 ms 16212 KB Output is correct
31 Correct 12 ms 16236 KB Output is correct
32 Correct 10 ms 16212 KB Output is correct
33 Correct 11 ms 16232 KB Output is correct
34 Correct 10 ms 16232 KB Output is correct
35 Correct 10 ms 16212 KB Output is correct
36 Correct 9 ms 16224 KB Output is correct
37 Correct 11 ms 16212 KB Output is correct
38 Correct 12 ms 16228 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 15956 KB Output is correct
2 Correct 9 ms 15896 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 8 ms 15960 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 9 ms 15956 KB Output is correct
9 Correct 8 ms 15956 KB Output is correct
10 Correct 8 ms 16004 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 8 ms 15940 KB Output is correct
13 Correct 9 ms 15972 KB Output is correct
14 Correct 9 ms 15980 KB Output is correct
15 Correct 9 ms 15968 KB Output is correct
16 Correct 9 ms 15964 KB Output is correct
17 Correct 9 ms 15956 KB Output is correct
18 Correct 9 ms 16008 KB Output is correct
19 Correct 129 ms 42948 KB Output is correct
20 Correct 117 ms 42884 KB Output is correct
21 Correct 128 ms 42676 KB Output is correct
22 Correct 112 ms 42444 KB Output is correct
23 Correct 133 ms 50968 KB Output is correct
24 Correct 112 ms 44740 KB Output is correct
25 Correct 113 ms 41484 KB Output is correct
26 Correct 82 ms 44712 KB Output is correct
27 Correct 211 ms 63592 KB Output is correct
28 Correct 260 ms 83112 KB Output is correct
29 Correct 288 ms 82800 KB Output is correct
30 Correct 193 ms 63636 KB Output is correct
31 Correct 204 ms 63600 KB Output is correct
32 Correct 283 ms 63612 KB Output is correct
33 Correct 202 ms 66564 KB Output is correct
34 Correct 371 ms 89600 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 15956 KB Output is correct
2 Correct 9 ms 15896 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 8 ms 15960 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 9 ms 15956 KB Output is correct
8 Correct 9 ms 15956 KB Output is correct
9 Correct 8 ms 15956 KB Output is correct
10 Correct 8 ms 16004 KB Output is correct
11 Correct 8 ms 15956 KB Output is correct
12 Correct 8 ms 15940 KB Output is correct
13 Correct 9 ms 15972 KB Output is correct
14 Correct 9 ms 15980 KB Output is correct
15 Correct 9 ms 15968 KB Output is correct
16 Correct 9 ms 15964 KB Output is correct
17 Correct 9 ms 15956 KB Output is correct
18 Correct 9 ms 16008 KB Output is correct
19 Correct 11 ms 15876 KB Output is correct
20 Correct 10 ms 15968 KB Output is correct
21 Correct 9 ms 16212 KB Output is correct
22 Correct 10 ms 16288 KB Output is correct
23 Correct 9 ms 16268 KB Output is correct
24 Correct 9 ms 16308 KB Output is correct
25 Correct 10 ms 16228 KB Output is correct
26 Correct 10 ms 16260 KB Output is correct
27 Correct 10 ms 16216 KB Output is correct
28 Correct 10 ms 16232 KB Output is correct
29 Correct 10 ms 16260 KB Output is correct
30 Correct 11 ms 16212 KB Output is correct
31 Correct 12 ms 16236 KB Output is correct
32 Correct 10 ms 16212 KB Output is correct
33 Correct 11 ms 16232 KB Output is correct
34 Correct 10 ms 16232 KB Output is correct
35 Correct 10 ms 16212 KB Output is correct
36 Correct 9 ms 16224 KB Output is correct
37 Correct 11 ms 16212 KB Output is correct
38 Correct 12 ms 16228 KB Output is correct
39 Correct 129 ms 42948 KB Output is correct
40 Correct 117 ms 42884 KB Output is correct
41 Correct 128 ms 42676 KB Output is correct
42 Correct 112 ms 42444 KB Output is correct
43 Correct 133 ms 50968 KB Output is correct
44 Correct 112 ms 44740 KB Output is correct
45 Correct 113 ms 41484 KB Output is correct
46 Correct 82 ms 44712 KB Output is correct
47 Correct 211 ms 63592 KB Output is correct
48 Correct 260 ms 83112 KB Output is correct
49 Correct 288 ms 82800 KB Output is correct
50 Correct 193 ms 63636 KB Output is correct
51 Correct 204 ms 63600 KB Output is correct
52 Correct 283 ms 63612 KB Output is correct
53 Correct 202 ms 66564 KB Output is correct
54 Correct 371 ms 89600 KB Output is correct
55 Correct 19 ms 19272 KB Output is correct
56 Correct 16 ms 18388 KB Output is correct
57 Correct 79 ms 40920 KB Output is correct
58 Correct 52 ms 37312 KB Output is correct
59 Correct 71 ms 49372 KB Output is correct
60 Correct 282 ms 82704 KB Output is correct
61 Correct 268 ms 66088 KB Output is correct
62 Correct 190 ms 63648 KB Output is correct
63 Correct 289 ms 63620 KB Output is correct
64 Correct 447 ms 99732 KB Output is correct
65 Correct 451 ms 99064 KB Output is correct
66 Correct 270 ms 81808 KB Output is correct
67 Correct 182 ms 60112 KB Output is correct
68 Correct 390 ms 74780 KB Output is correct
69 Correct 399 ms 78140 KB Output is correct
70 Correct 327 ms 72148 KB Output is correct