oj.uz

Submission #747635

# Submission time Handle Problem Language Result Execution time Memory
747635 2023-05-24T12:14:34 Z Szil Railway (BOI17_railway) C++14
100 / 100
 133 ms 25820 KB 
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

const int MAXN = 100001;
const int K = 20;

int n, m, k, x;
vector<pair<int, int>> g[MAXN];
int cnt[MAXN], up[MAXN][K], d[MAXN], tin[MAXN], timer = 1;

void dfs(int u, int p = 0) {
    d[u] = d[p] + 1;
    tin[u] = timer++;
    up[u][0] = p;
    for (int i = 1; i < K; i++) {
        up[u][i] = up[up[u][i - 1]][i - 1];
    }
    for (auto v : g[u]) {
        if (v.first != p) {
            dfs(v.first, u);
        }
    }
    
}

int lca(int a, int b) {
    int i = 19;
    if (d[a] < d[b]) swap(a, b);
    while (i >= 0 && d[a] > d[b]) {
        if (d[up[a][i]] >= d[b])a = up[a][i];
        i--;
    }
    if (a == b) return a;
    for (i = 19; i >= 0; i--) {
        if (up[a][i] != up[b][i]) {
            a = up[a][i];
            b = up[b][i];
        }
    }
    return up[a][0];
}

vector<int> ans;
int dfs2(int x, int p = 0, int id = 0) {
    for (auto u : g[x]) {
        if (u.first != p) cnt[x] += dfs2(u.first, x, u.second);
    }
    if (cnt[x] >= 2*k && id)ans.push_back(id);
    return cnt[x];
}

int main()
{
    ios::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m >> k;
    
    for (int i = 1; i <= n - 1; i++) {
        int a, b; cin >> a >> b;
        g[a].push_back({ b,i });
        g[b].push_back({ a,i });
    }

    dfs(1);

    for (int i = 1; i <= m; i++) {
        cin >> x;
        vector<int> v(x);
        for (int& i : v) cin >> i;
        sort(v.begin(), v.end(), [](int a, int b) {return tin[a] < tin[b]; });
        v.push_back(v[0]);
        for (int i = 0; i < x; i++) {
            int a = v[i], b = v[i+1];
            int u = lca(a, b);
            cnt[u] -= 2;
            cnt[a]++;
            cnt[b]++;
        }
    }
    dfs2(1);
    cout << ans.size() << '\n';
    sort(ans.begin(), ans.end());
    for (int i : ans)cout << i << ' ';
    cout << "\n";
    return 0;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 6 ms 4064 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 6 ms 4436 KB Output is correct
7 Correct 7 ms 4220 KB Output is correct
8 Correct 6 ms 4052 KB Output is correct
9 Correct 5 ms 4052 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 6 ms 4064 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 6 ms 4436 KB Output is correct
7 Correct 7 ms 4220 KB Output is correct
8 Correct 6 ms 4052 KB Output is correct
9 Correct 5 ms 4052 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct
15 Correct 32 ms 4344 KB Output is correct
16 Correct 25 ms 4424 KB Output is correct
17 Correct 25 ms 4424 KB Output is correct
18 Correct 7 ms 4436 KB Output is correct
19 Correct 6 ms 4052 KB Output is correct
20 Correct 20 ms 4632 KB Output is correct
21 Correct 21 ms 4668 KB Output is correct
22 Correct 1 ms 2672 KB Output is correct
23 Correct 6 ms 3976 KB Output is correct
24 Correct 6 ms 3964 KB Output is correct
25 Correct 2 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 7 ms 4436 KB Output is correct
28 Correct 6 ms 4092 KB Output is correct
29 Correct 6 ms 4052 KB Output is correct
30 Correct 6 ms 4052 KB Output is correct
31 Correct 2 ms 2672 KB Output is correct
32 Correct 2 ms 2668 KB Output is correct
33 Correct 2 ms 2676 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 25336 KB Output is correct
2 Correct 3 ms 2644 KB Output is correct
3 Correct 96 ms 24960 KB Output is correct
4 Correct 92 ms 24376 KB Output is correct
5 Correct 133 ms 25288 KB Output is correct
6 Correct 100 ms 25724 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 20892 KB Output is correct
2 Correct 91 ms 17572 KB Output is correct
3 Correct 98 ms 17180 KB Output is correct
4 Correct 103 ms 17140 KB Output is correct
5 Correct 102 ms 17176 KB Output is correct
6 Correct 78 ms 21068 KB Output is correct
7 Correct 77 ms 21040 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 20892 KB Output is correct
2 Correct 91 ms 17572 KB Output is correct
3 Correct 98 ms 17180 KB Output is correct
4 Correct 103 ms 17140 KB Output is correct
5 Correct 102 ms 17176 KB Output is correct
6 Correct 78 ms 21068 KB Output is correct
7 Correct 77 ms 21040 KB Output is correct
8 Correct 94 ms 21156 KB Output is correct
9 Correct 95 ms 21160 KB Output is correct
10 Correct 107 ms 25484 KB Output is correct
11 Correct 108 ms 25344 KB Output is correct
12 Correct 61 ms 16948 KB Output is correct
13 Correct 58 ms 16916 KB Output is correct
14 Correct 93 ms 17100 KB Output is correct
15 Correct 97 ms 17104 KB Output is correct
16 Correct 105 ms 17192 KB Output is correct
17 Correct 95 ms 17188 KB Output is correct
18 Correct 91 ms 17100 KB Output is correct
19 Correct 96 ms 17672 KB Output is correct
20 Correct 82 ms 21284 KB Output is correct
21 Correct 84 ms 21448 KB Output is correct
22 Correct 81 ms 21324 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 6 ms 4064 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 6 ms 4436 KB Output is correct
7 Correct 7 ms 4220 KB Output is correct
8 Correct 6 ms 4052 KB Output is correct
9 Correct 5 ms 4052 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct
15 Correct 32 ms 4344 KB Output is correct
16 Correct 25 ms 4424 KB Output is correct
17 Correct 25 ms 4424 KB Output is correct
18 Correct 7 ms 4436 KB Output is correct
19 Correct 6 ms 4052 KB Output is correct
20 Correct 20 ms 4632 KB Output is correct
21 Correct 21 ms 4668 KB Output is correct
22 Correct 1 ms 2672 KB Output is correct
23 Correct 6 ms 3976 KB Output is correct
24 Correct 6 ms 3964 KB Output is correct
25 Correct 2 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 7 ms 4436 KB Output is correct
28 Correct 6 ms 4092 KB Output is correct
29 Correct 6 ms 4052 KB Output is correct
30 Correct 6 ms 4052 KB Output is correct
31 Correct 2 ms 2672 KB Output is correct
32 Correct 2 ms 2668 KB Output is correct
33 Correct 2 ms 2676 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct
36 Correct 112 ms 25336 KB Output is correct
37 Correct 3 ms 2644 KB Output is correct
38 Correct 96 ms 24960 KB Output is correct
39 Correct 92 ms 24376 KB Output is correct
40 Correct 133 ms 25288 KB Output is correct
41 Correct 100 ms 25724 KB Output is correct
42 Correct 76 ms 20892 KB Output is correct
43 Correct 91 ms 17572 KB Output is correct
44 Correct 98 ms 17180 KB Output is correct
45 Correct 103 ms 17140 KB Output is correct
46 Correct 102 ms 17176 KB Output is correct
47 Correct 78 ms 21068 KB Output is correct
48 Correct 77 ms 21040 KB Output is correct
49 Correct 94 ms 21156 KB Output is correct
50 Correct 95 ms 21160 KB Output is correct
51 Correct 107 ms 25484 KB Output is correct
52 Correct 108 ms 25344 KB Output is correct
53 Correct 61 ms 16948 KB Output is correct
54 Correct 58 ms 16916 KB Output is correct
55 Correct 93 ms 17100 KB Output is correct
56 Correct 97 ms 17104 KB Output is correct
57 Correct 105 ms 17192 KB Output is correct
58 Correct 95 ms 17188 KB Output is correct
59 Correct 91 ms 17100 KB Output is correct
60 Correct 96 ms 17672 KB Output is correct
61 Correct 82 ms 21284 KB Output is correct
62 Correct 84 ms 21448 KB Output is correct
63 Correct 81 ms 21324 KB Output is correct
64 Correct 90 ms 21268 KB Output is correct
65 Correct 113 ms 17176 KB Output is correct
66 Correct 119 ms 17044 KB Output is correct
67 Correct 100 ms 17024 KB Output is correct
68 Correct 58 ms 16848 KB Output is correct
69 Correct 62 ms 16880 KB Output is correct
70 Correct 95 ms 21544 KB Output is correct
71 Correct 114 ms 20932 KB Output is correct
72 Correct 2 ms 2676 KB Output is correct
73 Correct 6 ms 4052 KB Output is correct
74 Correct 6 ms 4052 KB Output is correct
75 Correct 2 ms 2680 KB Output is correct
76 Correct 2 ms 2676 KB Output is correct
77 Correct 7 ms 4480 KB Output is correct
78 Correct 6 ms 4052 KB Output is correct
79 Correct 5 ms 3972 KB Output is correct
80 Correct 6 ms 4100 KB Output is correct
81 Correct 2 ms 2644 KB Output is correct
82 Correct 2 ms 2644 KB Output is correct
83 Correct 2 ms 2676 KB Output is correct
84 Correct 2 ms 2644 KB Output is correct
85 Correct 2 ms 2644 KB Output is correct
86 Correct 26 ms 4336 KB Output is correct
87 Correct 27 ms 4464 KB Output is correct
88 Correct 30 ms 4424 KB Output is correct
89 Correct 7 ms 4436 KB Output is correct
90 Correct 9 ms 4100 KB Output is correct
91 Correct 18 ms 4636 KB Output is correct
92 Correct 20 ms 4436 KB Output is correct
93 Correct 2 ms 2644 KB Output is correct
94 Correct 127 ms 25260 KB Output is correct
95 Correct 122 ms 24988 KB Output is correct
96 Correct 103 ms 24412 KB Output is correct
97 Correct 114 ms 25328 KB Output is correct
98 Correct 103 ms 25820 KB Output is correct
99 Correct 100 ms 17172 KB Output is correct
100 Correct 106 ms 17204 KB Output is correct
101 Correct 98 ms 17188 KB Output is correct
102 Correct 94 ms 17516 KB Output is correct
103 Correct 79 ms 21016 KB Output is correct
104 Correct 85 ms 21360 KB Output is correct
105 Correct 91 ms 20992 KB Output is correct
106 Correct 90 ms 21244 KB Output is correct
107 Correct 89 ms 21068 KB Output is correct
108 Correct 98 ms 25372 KB Output is correct
109 Correct 95 ms 25348 KB Output is correct
110 Correct 58 ms 17016 KB Output is correct
111 Correct 58 ms 16872 KB Output is correct
112 Correct 89 ms 17100 KB Output is correct
113 Correct 88 ms 17044 KB Output is correct