oj.uz

Submission #445966

# Submission time Handle Problem Language Result Execution time Memory
445966 2021-07-20T09:41:44 Z prvocislo Railway (BOI17_railway) C++17
100 / 100
 199 ms 23356 KB 
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

const int maxn = 1e5 + 5, logn = 17;
int n, m, k, l[logn][maxn], tin[maxn], d[maxn], sum[maxn], id[maxn], timer = 0;
vector<pair<int, int> > g[maxn];
void dfs1(int u)
{
    tin[u] = timer++;
    for (int i = 1; i < logn; i++) l[i][u] = l[i-1][l[i-1][u]];
    for (pair<int, int> v : g[u])
    {
        if (v.first == l[0][u]) continue;
        l[0][v.first] = u, d[v.first] = d[u] + 1;
        id[v.first] = v.second;
        dfs1(v.first);
    }
}
int lca(int a, int b)
{
    if (d[a] < d[b]) swap(a, b);
    for (int i = logn-1; i >= 0; i--) if (d[l[i][a]] >= d[b]) a = l[i][a];
    if (a==b) return a;
    for (int i = logn-1; i >= 0; i--) if (l[i][a] ^ l[i][b]) a = l[i][a], b = l[i][b];
    return l[0][a];
}
vector<int> ans;
void dfs2(int u)
{
    for (pair<int, int> v : g[u]) if (v.first ^ l[0][u]) 
    {
        dfs2(v.first);
        sum[u] += sum[v.first];
    }
    if (sum[u] >= k) ans.push_back(id[u]);
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m >> k;
    for (int i = 0, a, b; i < n-1; i++)
    {
        cin >> a >> b, a--, b--;
        g[a].push_back({b, i+1}), g[b].push_back({a, i+1});
    }
    dfs1(0);
    for (int i = 0; i < m; i++)
    {
        int s; cin >> s;
        vector<pair<int, int> > v(s);
        for (int j = 0; j < s; j++) cin >> v[j].second, sum[--v[j].second]++, v[j].first = tin[v[j].second];
        sort(v.begin(), v.end());
        int root = v[0].second;
        for (int j = 1; j < s; j++)
        {
            int l = lca(v[j-1].second, v[j].second);
            root = lca(root, v[j].second);
            sum[l]--;
        }
        sum[root]--;
    }
    dfs2(0);
    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 2664 KB Output is correct
2 Correct 7 ms 4044 KB Output is correct
3 Correct 7 ms 4044 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 3 ms 2680 KB Output is correct
6 Correct 8 ms 4428 KB Output is correct
7 Correct 8 ms 4044 KB Output is correct
8 Correct 7 ms 4056 KB Output is correct
9 Correct 7 ms 4092 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 2 ms 2764 KB Output is correct
12 Correct 2 ms 2764 KB Output is correct
13 Correct 2 ms 2696 KB Output is correct
14 Correct 2 ms 2764 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2664 KB Output is correct
2 Correct 7 ms 4044 KB Output is correct
3 Correct 7 ms 4044 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 3 ms 2680 KB Output is correct
6 Correct 8 ms 4428 KB Output is correct
7 Correct 8 ms 4044 KB Output is correct
8 Correct 7 ms 4056 KB Output is correct
9 Correct 7 ms 4092 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 2 ms 2764 KB Output is correct
12 Correct 2 ms 2764 KB Output is correct
13 Correct 2 ms 2696 KB Output is correct
14 Correct 2 ms 2764 KB Output is correct
15 Correct 39 ms 4436 KB Output is correct
16 Correct 40 ms 4468 KB Output is correct
17 Correct 40 ms 4428 KB Output is correct
18 Correct 8 ms 4428 KB Output is correct
19 Correct 7 ms 4044 KB Output is correct
20 Correct 38 ms 4564 KB Output is correct
21 Correct 42 ms 4496 KB Output is correct
22 Correct 2 ms 2764 KB Output is correct
23 Correct 8 ms 3976 KB Output is correct
24 Correct 8 ms 4076 KB Output is correct
25 Correct 2 ms 2764 KB Output is correct
26 Correct 2 ms 2764 KB Output is correct
27 Correct 8 ms 4388 KB Output is correct
28 Correct 7 ms 4096 KB Output is correct
29 Correct 6 ms 4092 KB Output is correct
30 Correct 7 ms 4044 KB Output is correct
31 Correct 2 ms 2764 KB Output is correct
32 Correct 2 ms 2764 KB Output is correct
33 Correct 2 ms 2764 KB Output is correct
34 Correct 2 ms 2764 KB Output is correct
35 Correct 2 ms 2764 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 131 ms 23020 KB Output is correct
2 Correct 2 ms 2764 KB Output is correct
3 Correct 120 ms 22584 KB Output is correct
4 Correct 118 ms 22084 KB Output is correct
5 Correct 192 ms 22912 KB Output is correct
6 Correct 147 ms 23268 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 19400 KB Output is correct
2 Correct 121 ms 16708 KB Output is correct
3 Correct 137 ms 16396 KB Output is correct
4 Correct 132 ms 16276 KB Output is correct
5 Correct 133 ms 16324 KB Output is correct
6 Correct 93 ms 19520 KB Output is correct
7 Correct 93 ms 19420 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 19400 KB Output is correct
2 Correct 121 ms 16708 KB Output is correct
3 Correct 137 ms 16396 KB Output is correct
4 Correct 132 ms 16276 KB Output is correct
5 Correct 133 ms 16324 KB Output is correct
6 Correct 93 ms 19520 KB Output is correct
7 Correct 93 ms 19420 KB Output is correct
8 Correct 119 ms 19572 KB Output is correct
9 Correct 116 ms 19524 KB Output is correct
10 Correct 147 ms 22972 KB Output is correct
11 Correct 148 ms 23044 KB Output is correct
12 Correct 102 ms 16080 KB Output is correct
13 Correct 98 ms 16088 KB Output is correct
14 Correct 142 ms 16264 KB Output is correct
15 Correct 147 ms 16328 KB Output is correct
16 Correct 135 ms 16324 KB Output is correct
17 Correct 136 ms 16324 KB Output is correct
18 Correct 133 ms 16504 KB Output is correct
19 Correct 120 ms 16776 KB Output is correct
20 Correct 93 ms 19768 KB Output is correct
21 Correct 95 ms 19856 KB Output is correct
22 Correct 100 ms 19848 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2664 KB Output is correct
2 Correct 7 ms 4044 KB Output is correct
3 Correct 7 ms 4044 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 3 ms 2680 KB Output is correct
6 Correct 8 ms 4428 KB Output is correct
7 Correct 8 ms 4044 KB Output is correct
8 Correct 7 ms 4056 KB Output is correct
9 Correct 7 ms 4092 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 2 ms 2764 KB Output is correct
12 Correct 2 ms 2764 KB Output is correct
13 Correct 2 ms 2696 KB Output is correct
14 Correct 2 ms 2764 KB Output is correct
15 Correct 39 ms 4436 KB Output is correct
16 Correct 40 ms 4468 KB Output is correct
17 Correct 40 ms 4428 KB Output is correct
18 Correct 8 ms 4428 KB Output is correct
19 Correct 7 ms 4044 KB Output is correct
20 Correct 38 ms 4564 KB Output is correct
21 Correct 42 ms 4496 KB Output is correct
22 Correct 2 ms 2764 KB Output is correct
23 Correct 8 ms 3976 KB Output is correct
24 Correct 8 ms 4076 KB Output is correct
25 Correct 2 ms 2764 KB Output is correct
26 Correct 2 ms 2764 KB Output is correct
27 Correct 8 ms 4388 KB Output is correct
28 Correct 7 ms 4096 KB Output is correct
29 Correct 6 ms 4092 KB Output is correct
30 Correct 7 ms 4044 KB Output is correct
31 Correct 2 ms 2764 KB Output is correct
32 Correct 2 ms 2764 KB Output is correct
33 Correct 2 ms 2764 KB Output is correct
34 Correct 2 ms 2764 KB Output is correct
35 Correct 2 ms 2764 KB Output is correct
36 Correct 131 ms 23020 KB Output is correct
37 Correct 2 ms 2764 KB Output is correct
38 Correct 120 ms 22584 KB Output is correct
39 Correct 118 ms 22084 KB Output is correct
40 Correct 192 ms 22912 KB Output is correct
41 Correct 147 ms 23268 KB Output is correct
42 Correct 97 ms 19400 KB Output is correct
43 Correct 121 ms 16708 KB Output is correct
44 Correct 137 ms 16396 KB Output is correct
45 Correct 132 ms 16276 KB Output is correct
46 Correct 133 ms 16324 KB Output is correct
47 Correct 93 ms 19520 KB Output is correct
48 Correct 93 ms 19420 KB Output is correct
49 Correct 119 ms 19572 KB Output is correct
50 Correct 116 ms 19524 KB Output is correct
51 Correct 147 ms 22972 KB Output is correct
52 Correct 148 ms 23044 KB Output is correct
53 Correct 102 ms 16080 KB Output is correct
54 Correct 98 ms 16088 KB Output is correct
55 Correct 142 ms 16264 KB Output is correct
56 Correct 147 ms 16328 KB Output is correct
57 Correct 135 ms 16324 KB Output is correct
58 Correct 136 ms 16324 KB Output is correct
59 Correct 133 ms 16504 KB Output is correct
60 Correct 120 ms 16776 KB Output is correct
61 Correct 93 ms 19768 KB Output is correct
62 Correct 95 ms 19856 KB Output is correct
63 Correct 100 ms 19848 KB Output is correct
64 Correct 104 ms 19704 KB Output is correct
65 Correct 183 ms 16324 KB Output is correct
66 Correct 172 ms 16324 KB Output is correct
67 Correct 154 ms 16300 KB Output is correct
68 Correct 93 ms 16068 KB Output is correct
69 Correct 92 ms 16036 KB Output is correct
70 Correct 123 ms 20024 KB Output is correct
71 Correct 132 ms 19268 KB Output is correct
72 Correct 2 ms 2764 KB Output is correct
73 Correct 8 ms 4044 KB Output is correct
74 Correct 8 ms 4044 KB Output is correct
75 Correct 2 ms 2672 KB Output is correct
76 Correct 2 ms 2764 KB Output is correct
77 Correct 8 ms 4428 KB Output is correct
78 Correct 8 ms 4044 KB Output is correct
79 Correct 6 ms 4088 KB Output is correct
80 Correct 8 ms 4044 KB Output is correct
81 Correct 2 ms 2764 KB Output is correct
82 Correct 2 ms 2764 KB Output is correct
83 Correct 2 ms 2764 KB Output is correct
84 Correct 2 ms 2764 KB Output is correct
85 Correct 2 ms 2764 KB Output is correct
86 Correct 40 ms 4428 KB Output is correct
87 Correct 41 ms 4420 KB Output is correct
88 Correct 41 ms 4472 KB Output is correct
89 Correct 8 ms 4348 KB Output is correct
90 Correct 8 ms 4044 KB Output is correct
91 Correct 38 ms 4564 KB Output is correct
92 Correct 41 ms 4548 KB Output is correct
93 Correct 2 ms 2888 KB Output is correct
94 Correct 126 ms 22964 KB Output is correct
95 Correct 145 ms 22544 KB Output is correct
96 Correct 136 ms 22128 KB Output is correct
97 Correct 199 ms 22960 KB Output is correct
98 Correct 149 ms 23356 KB Output is correct
99 Correct 158 ms 16400 KB Output is correct
100 Correct 147 ms 16324 KB Output is correct
101 Correct 145 ms 16388 KB Output is correct
102 Correct 135 ms 16708 KB Output is correct
103 Correct 93 ms 19536 KB Output is correct
104 Correct 99 ms 19760 KB Output is correct
105 Correct 100 ms 19480 KB Output is correct
106 Correct 114 ms 19624 KB Output is correct
107 Correct 154 ms 19504 KB Output is correct
108 Correct 142 ms 23044 KB Output is correct
109 Correct 144 ms 22972 KB Output is correct
110 Correct 100 ms 16108 KB Output is correct
111 Correct 125 ms 16172 KB Output is correct
112 Correct 159 ms 16256 KB Output is correct
113 Correct 154 ms 16380 KB Output is correct