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Submission #629968

# Submission time Handle Problem Language Result Execution time Memory
629968 2022-08-15T12:54:48 Z bebra Race (IOI11_race) C++17
100 / 100
 463 ms 96328 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;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 16072 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 9 ms 15984 KB Output is correct
5 Correct 10 ms 16000 KB Output is correct
6 Correct 9 ms 15960 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 9 ms 15940 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 9 ms 16008 KB Output is correct
11 Correct 9 ms 15956 KB Output is correct
12 Correct 8 ms 16008 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 9 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 9 ms 15956 KB Output is correct
17 Correct 11 ms 16004 KB Output is correct
18 Correct 9 ms 15896 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 16072 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 9 ms 15984 KB Output is correct
5 Correct 10 ms 16000 KB Output is correct
6 Correct 9 ms 15960 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 9 ms 15940 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 9 ms 16008 KB Output is correct
11 Correct 9 ms 15956 KB Output is correct
12 Correct 8 ms 16008 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 9 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 9 ms 15956 KB Output is correct
17 Correct 11 ms 16004 KB Output is correct
18 Correct 9 ms 15896 KB Output is correct
19 Correct 9 ms 16084 KB Output is correct
20 Correct 9 ms 15956 KB Output is correct
21 Correct 9 ms 16268 KB Output is correct
22 Correct 11 ms 16276 KB Output is correct
23 Correct 11 ms 16280 KB Output is correct
24 Correct 10 ms 16220 KB Output is correct
25 Correct 11 ms 16296 KB Output is correct
26 Correct 9 ms 16296 KB Output is correct
27 Correct 10 ms 16084 KB Output is correct
28 Correct 9 ms 16212 KB Output is correct
29 Correct 9 ms 16292 KB Output is correct
30 Correct 9 ms 16212 KB Output is correct
31 Correct 11 ms 16212 KB Output is correct
32 Correct 10 ms 16212 KB Output is correct
33 Correct 11 ms 16340 KB Output is correct
34 Correct 10 ms 16212 KB Output is correct
35 Correct 10 ms 16212 KB Output is correct
36 Correct 9 ms 16212 KB Output is correct
37 Correct 10 ms 16192 KB Output is correct
38 Correct 9 ms 16212 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 16072 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 9 ms 15984 KB Output is correct
5 Correct 10 ms 16000 KB Output is correct
6 Correct 9 ms 15960 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 9 ms 15940 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 9 ms 16008 KB Output is correct
11 Correct 9 ms 15956 KB Output is correct
12 Correct 8 ms 16008 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 9 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 9 ms 15956 KB Output is correct
17 Correct 11 ms 16004 KB Output is correct
18 Correct 9 ms 15896 KB Output is correct
19 Correct 114 ms 41584 KB Output is correct
20 Correct 111 ms 41472 KB Output is correct
21 Correct 113 ms 41296 KB Output is correct
22 Correct 118 ms 40960 KB Output is correct
23 Correct 132 ms 49452 KB Output is correct
24 Correct 115 ms 43260 KB Output is correct
25 Correct 116 ms 40124 KB Output is correct
26 Correct 65 ms 43464 KB Output is correct
27 Correct 198 ms 60616 KB Output is correct
28 Correct 262 ms 79940 KB Output is correct
29 Correct 261 ms 79608 KB Output is correct
30 Correct 199 ms 60720 KB Output is correct
31 Correct 223 ms 60724 KB Output is correct
32 Correct 314 ms 60624 KB Output is correct
33 Correct 200 ms 63820 KB Output is correct
34 Correct 374 ms 85764 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 16072 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 9 ms 15984 KB Output is correct
5 Correct 10 ms 16000 KB Output is correct
6 Correct 9 ms 15960 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 9 ms 15940 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 9 ms 16008 KB Output is correct
11 Correct 9 ms 15956 KB Output is correct
12 Correct 8 ms 16008 KB Output is correct
13 Correct 8 ms 15956 KB Output is correct
14 Correct 9 ms 15956 KB Output is correct
15 Correct 8 ms 15956 KB Output is correct
16 Correct 9 ms 15956 KB Output is correct
17 Correct 11 ms 16004 KB Output is correct
18 Correct 9 ms 15896 KB Output is correct
19 Correct 9 ms 16084 KB Output is correct
20 Correct 9 ms 15956 KB Output is correct
21 Correct 9 ms 16268 KB Output is correct
22 Correct 11 ms 16276 KB Output is correct
23 Correct 11 ms 16280 KB Output is correct
24 Correct 10 ms 16220 KB Output is correct
25 Correct 11 ms 16296 KB Output is correct
26 Correct 9 ms 16296 KB Output is correct
27 Correct 10 ms 16084 KB Output is correct
28 Correct 9 ms 16212 KB Output is correct
29 Correct 9 ms 16292 KB Output is correct
30 Correct 9 ms 16212 KB Output is correct
31 Correct 11 ms 16212 KB Output is correct
32 Correct 10 ms 16212 KB Output is correct
33 Correct 11 ms 16340 KB Output is correct
34 Correct 10 ms 16212 KB Output is correct
35 Correct 10 ms 16212 KB Output is correct
36 Correct 9 ms 16212 KB Output is correct
37 Correct 10 ms 16192 KB Output is correct
38 Correct 9 ms 16212 KB Output is correct
39 Correct 114 ms 41584 KB Output is correct
40 Correct 111 ms 41472 KB Output is correct
41 Correct 113 ms 41296 KB Output is correct
42 Correct 118 ms 40960 KB Output is correct
43 Correct 132 ms 49452 KB Output is correct
44 Correct 115 ms 43260 KB Output is correct
45 Correct 116 ms 40124 KB Output is correct
46 Correct 65 ms 43464 KB Output is correct
47 Correct 198 ms 60616 KB Output is correct
48 Correct 262 ms 79940 KB Output is correct
49 Correct 261 ms 79608 KB Output is correct
50 Correct 199 ms 60720 KB Output is correct
51 Correct 223 ms 60724 KB Output is correct
52 Correct 314 ms 60624 KB Output is correct
53 Correct 200 ms 63820 KB Output is correct
54 Correct 374 ms 85764 KB Output is correct
55 Correct 20 ms 19124 KB Output is correct
56 Correct 15 ms 18260 KB Output is correct
57 Correct 78 ms 39636 KB Output is correct
58 Correct 51 ms 36276 KB Output is correct
59 Correct 71 ms 47964 KB Output is correct
60 Correct 264 ms 79788 KB Output is correct
61 Correct 233 ms 63052 KB Output is correct
62 Correct 205 ms 60644 KB Output is correct
63 Correct 311 ms 60684 KB Output is correct
64 Correct 448 ms 96328 KB Output is correct
65 Correct 463 ms 95204 KB Output is correct
66 Correct 325 ms 78548 KB Output is correct
67 Correct 185 ms 56728 KB Output is correct
68 Correct 384 ms 71156 KB Output is correct
69 Correct 375 ms 74476 KB Output is correct
70 Correct 354 ms 68732 KB Output is correct