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답안 #1043960

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1043960 2024-08-05T05:17:11 Z GasmaskChan 경주 (Race) (IOI11_race) C++17
100 / 100
 392 ms 49784 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX = 2e5 + 5;
vector<pair<int, int>> g[MAX];

int k, ans = 1e9;
bitset<MAX> deleted;

struct cal {
    unordered_map<int, int> mp;

    void update(int u, int p, int sum, int depth) {
        if (sum > k) return;
        auto &cur = mp[sum];
        if (cur == 0) cur = depth;
        else cur = min(cur, depth);

        for (auto &[v, w] : g[u]) {
            if (v != p && !deleted[v]) {
                update(v, u, sum + w, depth + 1);
            }
        }
    }

    void add(int u, int p, int sum, int depth) {
        if (sum > k) return;
        auto it = mp.find(k - sum);
        if (it != mp.end()) ans = min(ans, it->second + depth);

        for (auto &[v, w] : g[u]) {
            if (v != p && !deleted[v]) {
                add(v, u, sum + w, depth + 1);
            }
        }
    }

    void lamviec(int u) {
        mp[0] = 0;
        for (auto &[v, w] : g[u]) {
            if (!deleted[v]) {
                add(v, u, w, 1);
                update(v, u, w, 1);
            }
        }
    }
};

int sz[MAX];
void dfs(int u, int p) {
    sz[u] = 1;
    for (auto &[v, w] : g[u]) {
        if (v != p && !deleted[v]) {
            dfs(v, u);
            sz[u] += sz[v];
        }
    }
}

int findcentroid(int u, int p, const int &n) {
    for (auto &[v, w] : g[u]) {
        if (v != p && !deleted[v] && sz[v] * 2 > n) return findcentroid(v, u, n);
    }
    return u;
}

void decompose(int u) {
    dfs(u, 0);
    u = findcentroid(u, 0, sz[u]);
    deleted[u] = true;
    cal tmp; tmp.lamviec(u);

    for (auto &[v, w] : g[u]) {
        if (!deleted[v]) {
            decompose(v);
        }
    }
}

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

    decompose(1);

    if (ans == (int)1e9) ans = -1;
    return ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 9576 KB Output is correct
2 Correct 1 ms 9564 KB Output is correct
3 Correct 1 ms 9564 KB Output is correct
4 Correct 1 ms 9564 KB Output is correct
5 Correct 1 ms 9564 KB Output is correct
6 Correct 2 ms 9564 KB Output is correct
7 Correct 1 ms 9564 KB Output is correct
8 Correct 1 ms 9564 KB Output is correct
9 Correct 1 ms 9564 KB Output is correct
10 Correct 1 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 1 ms 9564 KB Output is correct
13 Correct 1 ms 9564 KB Output is correct
14 Correct 1 ms 9564 KB Output is correct
15 Correct 1 ms 9564 KB Output is correct
16 Correct 1 ms 9564 KB Output is correct
17 Correct 1 ms 9564 KB Output is correct
18 Correct 1 ms 9560 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 9576 KB Output is correct
2 Correct 1 ms 9564 KB Output is correct
3 Correct 1 ms 9564 KB Output is correct
4 Correct 1 ms 9564 KB Output is correct
5 Correct 1 ms 9564 KB Output is correct
6 Correct 2 ms 9564 KB Output is correct
7 Correct 1 ms 9564 KB Output is correct
8 Correct 1 ms 9564 KB Output is correct
9 Correct 1 ms 9564 KB Output is correct
10 Correct 1 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 1 ms 9564 KB Output is correct
13 Correct 1 ms 9564 KB Output is correct
14 Correct 1 ms 9564 KB Output is correct
15 Correct 1 ms 9564 KB Output is correct
16 Correct 1 ms 9564 KB Output is correct
17 Correct 1 ms 9564 KB Output is correct
18 Correct 1 ms 9560 KB Output is correct
19 Correct 1 ms 9564 KB Output is correct
20 Correct 2 ms 9564 KB Output is correct
21 Correct 2 ms 9564 KB Output is correct
22 Correct 2 ms 9564 KB Output is correct
23 Correct 2 ms 9560 KB Output is correct
24 Correct 2 ms 9564 KB Output is correct
25 Correct 2 ms 9564 KB Output is correct
26 Correct 2 ms 9564 KB Output is correct
27 Correct 1 ms 9564 KB Output is correct
28 Correct 2 ms 9564 KB Output is correct
29 Correct 2 ms 9564 KB Output is correct
30 Correct 2 ms 9564 KB Output is correct
31 Correct 2 ms 9648 KB Output is correct
32 Correct 2 ms 9564 KB Output is correct
33 Correct 2 ms 9564 KB Output is correct
34 Correct 2 ms 9564 KB Output is correct
35 Correct 2 ms 9564 KB Output is correct
36 Correct 2 ms 9576 KB Output is correct
37 Correct 2 ms 9564 KB Output is correct
38 Correct 2 ms 9564 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 9576 KB Output is correct
2 Correct 1 ms 9564 KB Output is correct
3 Correct 1 ms 9564 KB Output is correct
4 Correct 1 ms 9564 KB Output is correct
5 Correct 1 ms 9564 KB Output is correct
6 Correct 2 ms 9564 KB Output is correct
7 Correct 1 ms 9564 KB Output is correct
8 Correct 1 ms 9564 KB Output is correct
9 Correct 1 ms 9564 KB Output is correct
10 Correct 1 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 1 ms 9564 KB Output is correct
13 Correct 1 ms 9564 KB Output is correct
14 Correct 1 ms 9564 KB Output is correct
15 Correct 1 ms 9564 KB Output is correct
16 Correct 1 ms 9564 KB Output is correct
17 Correct 1 ms 9564 KB Output is correct
18 Correct 1 ms 9560 KB Output is correct
19 Correct 77 ms 15452 KB Output is correct
20 Correct 76 ms 15452 KB Output is correct
21 Correct 91 ms 15392 KB Output is correct
22 Correct 84 ms 15448 KB Output is correct
23 Correct 43 ms 15704 KB Output is correct
24 Correct 36 ms 15452 KB Output is correct
25 Correct 82 ms 18248 KB Output is correct
26 Correct 83 ms 21204 KB Output is correct
27 Correct 123 ms 19280 KB Output is correct
28 Correct 142 ms 30288 KB Output is correct
29 Correct 147 ms 29528 KB Output is correct
30 Correct 128 ms 19284 KB Output is correct
31 Correct 119 ms 19292 KB Output is correct
32 Correct 121 ms 19228 KB Output is correct
33 Correct 118 ms 18256 KB Output is correct
34 Correct 96 ms 18260 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 9576 KB Output is correct
2 Correct 1 ms 9564 KB Output is correct
3 Correct 1 ms 9564 KB Output is correct
4 Correct 1 ms 9564 KB Output is correct
5 Correct 1 ms 9564 KB Output is correct
6 Correct 2 ms 9564 KB Output is correct
7 Correct 1 ms 9564 KB Output is correct
8 Correct 1 ms 9564 KB Output is correct
9 Correct 1 ms 9564 KB Output is correct
10 Correct 1 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 1 ms 9564 KB Output is correct
13 Correct 1 ms 9564 KB Output is correct
14 Correct 1 ms 9564 KB Output is correct
15 Correct 1 ms 9564 KB Output is correct
16 Correct 1 ms 9564 KB Output is correct
17 Correct 1 ms 9564 KB Output is correct
18 Correct 1 ms 9560 KB Output is correct
19 Correct 1 ms 9564 KB Output is correct
20 Correct 2 ms 9564 KB Output is correct
21 Correct 2 ms 9564 KB Output is correct
22 Correct 2 ms 9564 KB Output is correct
23 Correct 2 ms 9560 KB Output is correct
24 Correct 2 ms 9564 KB Output is correct
25 Correct 2 ms 9564 KB Output is correct
26 Correct 2 ms 9564 KB Output is correct
27 Correct 1 ms 9564 KB Output is correct
28 Correct 2 ms 9564 KB Output is correct
29 Correct 2 ms 9564 KB Output is correct
30 Correct 2 ms 9564 KB Output is correct
31 Correct 2 ms 9648 KB Output is correct
32 Correct 2 ms 9564 KB Output is correct
33 Correct 2 ms 9564 KB Output is correct
34 Correct 2 ms 9564 KB Output is correct
35 Correct 2 ms 9564 KB Output is correct
36 Correct 2 ms 9576 KB Output is correct
37 Correct 2 ms 9564 KB Output is correct
38 Correct 2 ms 9564 KB Output is correct
39 Correct 77 ms 15452 KB Output is correct
40 Correct 76 ms 15452 KB Output is correct
41 Correct 91 ms 15392 KB Output is correct
42 Correct 84 ms 15448 KB Output is correct
43 Correct 43 ms 15704 KB Output is correct
44 Correct 36 ms 15452 KB Output is correct
45 Correct 82 ms 18248 KB Output is correct
46 Correct 83 ms 21204 KB Output is correct
47 Correct 123 ms 19280 KB Output is correct
48 Correct 142 ms 30288 KB Output is correct
49 Correct 147 ms 29528 KB Output is correct
50 Correct 128 ms 19284 KB Output is correct
51 Correct 119 ms 19292 KB Output is correct
52 Correct 121 ms 19228 KB Output is correct
53 Correct 118 ms 18256 KB Output is correct
54 Correct 96 ms 18260 KB Output is correct
55 Correct 9 ms 10076 KB Output is correct
56 Correct 8 ms 9820 KB Output is correct
57 Correct 68 ms 15716 KB Output is correct
58 Correct 36 ms 16592 KB Output is correct
59 Correct 132 ms 28388 KB Output is correct
60 Correct 392 ms 49784 KB Output is correct
61 Correct 157 ms 22612 KB Output is correct
62 Correct 155 ms 22544 KB Output is correct
63 Correct 153 ms 22356 KB Output is correct
64 Correct 309 ms 32456 KB Output is correct
65 Correct 90 ms 23120 KB Output is correct
66 Correct 277 ms 32084 KB Output is correct
67 Correct 94 ms 23040 KB Output is correct
68 Correct 156 ms 29028 KB Output is correct
69 Correct 163 ms 29028 KB Output is correct
70 Correct 174 ms 28656 KB Output is correct