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Submission #987846

# Submission time Handle Problem Language Result Execution time Memory
987846 2024-05-23T16:41:04 Z Acanikolic Railway (BOI17_railway) C++14
100 / 100
 205 ms 35176 KB 
#include <bits/stdc++.h>

#define pb push_back

#define S second

#define F first

const int N = 1e5 + 10;

const int inf = 2e9;

const int lg = 17;

using namespace std;

vector<int>g[N];
int in[N],out[N],timer = 0,up[N][lg],n,f[N];

void dfs(int x,int par) {
    in[x] = ++timer;
    up[x][0] = par;
    for(int j = 1; j < lg; j++) up[x][j] = up[up[x][j - 1]][j - 1];
    for(auto X : g[x]) {
        if(X == par) continue;
        dfs(X,x);
    }
    out[x] = timer;
}

void DFS(int x,int par) {
    for(auto X : g[x]) {
        if(X == par) continue;
        DFS(X,x);
        f[x] += f[X];
    }
}

bool intree(int u,int v) {
    return (in[u] <= in[v] && out[u] >= out[v]);
}

int lca(int u,int v) {
    if(intree(u,v)) return u;
    if(intree(v,u)) return v;
    for(int j = lg - 1; j >= 0; j--) {
        if(up[u][j] > 0 && !intree(up[u][j],v)) u = up[u][j];
    }
    return up[u][0];
}

bool cmp(int A,int B) {
    return (in[A] <= in[B]);
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int m,k;
    cin >> n >> m >> k;
    map<pair<int,int>,int>index;
    for(int i = 1; i < n; i++) {
        int u,v;
        cin >> u >> v;
        index[{u,v}] = i;
        index[{v,u}] = i;
        g[u].pb(v);
        g[v].pb(u);
    }
    dfs(1,0);
    for(int q = 1; q <= m; q++) {
        int s;
        cin >> s;
        vector<int>b;
        for(int i = 0; i < s; i++) {
            int x;
            cin >> x;
            b.pb(x);
        }
        sort(b.begin(),b.end(),cmp);
        b.pb(b[0]);
        for(int i = 0; i < s; i++) {
            f[b[i]] += 1;
            f[lca(b[i],b[i + 1])] -= 1;
        }
    }
    DFS(1,0);
    vector<int>ans;
    for(int i = 1; i <= n; i++) {
        if(f[i] >= k) {
            ans.push_back(index[{i,up[i][0]}]);
        }
    }
    sort(ans.begin(),ans.end());
    cout << ans.size() << "\n";
    for(auto X : ans) cout << X << " ";
    return 0;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6236 KB Output is correct
2 Correct 9 ms 7952 KB Output is correct
3 Correct 9 ms 7768 KB Output is correct
4 Correct 2 ms 6232 KB Output is correct
5 Correct 2 ms 6236 KB Output is correct
6 Correct 9 ms 8284 KB Output is correct
7 Correct 9 ms 7980 KB Output is correct
8 Correct 8 ms 7772 KB Output is correct
9 Correct 9 ms 7980 KB Output is correct
10 Correct 2 ms 6232 KB Output is correct
11 Correct 2 ms 6236 KB Output is correct
12 Correct 2 ms 6236 KB Output is correct
13 Correct 2 ms 6232 KB Output is correct
14 Correct 2 ms 6236 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6236 KB Output is correct
2 Correct 9 ms 7952 KB Output is correct
3 Correct 9 ms 7768 KB Output is correct
4 Correct 2 ms 6232 KB Output is correct
5 Correct 2 ms 6236 KB Output is correct
6 Correct 9 ms 8284 KB Output is correct
7 Correct 9 ms 7980 KB Output is correct
8 Correct 8 ms 7772 KB Output is correct
9 Correct 9 ms 7980 KB Output is correct
10 Correct 2 ms 6232 KB Output is correct
11 Correct 2 ms 6236 KB Output is correct
12 Correct 2 ms 6236 KB Output is correct
13 Correct 2 ms 6232 KB Output is correct
14 Correct 2 ms 6236 KB Output is correct
15 Correct 19 ms 7980 KB Output is correct
16 Correct 19 ms 8028 KB Output is correct
17 Correct 20 ms 8028 KB Output is correct
18 Correct 10 ms 8284 KB Output is correct
19 Correct 9 ms 8040 KB Output is correct
20 Correct 17 ms 8028 KB Output is correct
21 Correct 18 ms 7784 KB Output is correct
22 Correct 2 ms 6232 KB Output is correct
23 Correct 9 ms 7772 KB Output is correct
24 Correct 8 ms 7772 KB Output is correct
25 Correct 3 ms 6324 KB Output is correct
26 Correct 2 ms 6236 KB Output is correct
27 Correct 9 ms 8280 KB Output is correct
28 Correct 10 ms 8184 KB Output is correct
29 Correct 8 ms 8024 KB Output is correct
30 Correct 8 ms 7968 KB Output is correct
31 Correct 2 ms 6236 KB Output is correct
32 Correct 2 ms 6236 KB Output is correct
33 Correct 2 ms 6324 KB Output is correct
34 Correct 2 ms 6236 KB Output is correct
35 Correct 2 ms 6236 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 101 ms 34760 KB Output is correct
2 Correct 2 ms 6232 KB Output is correct
3 Correct 98 ms 34508 KB Output is correct
4 Correct 84 ms 33876 KB Output is correct
5 Correct 106 ms 34864 KB Output is correct
6 Correct 124 ms 35164 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 30036 KB Output is correct
2 Correct 174 ms 26708 KB Output is correct
3 Correct 137 ms 26308 KB Output is correct
4 Correct 166 ms 26340 KB Output is correct
5 Correct 160 ms 26208 KB Output is correct
6 Correct 115 ms 30292 KB Output is correct
7 Correct 129 ms 30288 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 30036 KB Output is correct
2 Correct 174 ms 26708 KB Output is correct
3 Correct 137 ms 26308 KB Output is correct
4 Correct 166 ms 26340 KB Output is correct
5 Correct 160 ms 26208 KB Output is correct
6 Correct 115 ms 30292 KB Output is correct
7 Correct 129 ms 30288 KB Output is correct
8 Correct 139 ms 30364 KB Output is correct
9 Correct 168 ms 30272 KB Output is correct
10 Correct 104 ms 35020 KB Output is correct
11 Correct 100 ms 35020 KB Output is correct
12 Correct 114 ms 26456 KB Output is correct
13 Correct 90 ms 26704 KB Output is correct
14 Correct 140 ms 26140 KB Output is correct
15 Correct 177 ms 26144 KB Output is correct
16 Correct 201 ms 26196 KB Output is correct
17 Correct 174 ms 26204 KB Output is correct
18 Correct 141 ms 26352 KB Output is correct
19 Correct 205 ms 26728 KB Output is correct
20 Correct 149 ms 30496 KB Output is correct
21 Correct 140 ms 30568 KB Output is correct
22 Correct 124 ms 30384 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6236 KB Output is correct
2 Correct 9 ms 7952 KB Output is correct
3 Correct 9 ms 7768 KB Output is correct
4 Correct 2 ms 6232 KB Output is correct
5 Correct 2 ms 6236 KB Output is correct
6 Correct 9 ms 8284 KB Output is correct
7 Correct 9 ms 7980 KB Output is correct
8 Correct 8 ms 7772 KB Output is correct
9 Correct 9 ms 7980 KB Output is correct
10 Correct 2 ms 6232 KB Output is correct
11 Correct 2 ms 6236 KB Output is correct
12 Correct 2 ms 6236 KB Output is correct
13 Correct 2 ms 6232 KB Output is correct
14 Correct 2 ms 6236 KB Output is correct
15 Correct 19 ms 7980 KB Output is correct
16 Correct 19 ms 8028 KB Output is correct
17 Correct 20 ms 8028 KB Output is correct
18 Correct 10 ms 8284 KB Output is correct
19 Correct 9 ms 8040 KB Output is correct
20 Correct 17 ms 8028 KB Output is correct
21 Correct 18 ms 7784 KB Output is correct
22 Correct 2 ms 6232 KB Output is correct
23 Correct 9 ms 7772 KB Output is correct
24 Correct 8 ms 7772 KB Output is correct
25 Correct 3 ms 6324 KB Output is correct
26 Correct 2 ms 6236 KB Output is correct
27 Correct 9 ms 8280 KB Output is correct
28 Correct 10 ms 8184 KB Output is correct
29 Correct 8 ms 8024 KB Output is correct
30 Correct 8 ms 7968 KB Output is correct
31 Correct 2 ms 6236 KB Output is correct
32 Correct 2 ms 6236 KB Output is correct
33 Correct 2 ms 6324 KB Output is correct
34 Correct 2 ms 6236 KB Output is correct
35 Correct 2 ms 6236 KB Output is correct
36 Correct 101 ms 34760 KB Output is correct
37 Correct 2 ms 6232 KB Output is correct
38 Correct 98 ms 34508 KB Output is correct
39 Correct 84 ms 33876 KB Output is correct
40 Correct 106 ms 34864 KB Output is correct
41 Correct 124 ms 35164 KB Output is correct
42 Correct 128 ms 30036 KB Output is correct
43 Correct 174 ms 26708 KB Output is correct
44 Correct 137 ms 26308 KB Output is correct
45 Correct 166 ms 26340 KB Output is correct
46 Correct 160 ms 26208 KB Output is correct
47 Correct 115 ms 30292 KB Output is correct
48 Correct 129 ms 30288 KB Output is correct
49 Correct 139 ms 30364 KB Output is correct
50 Correct 168 ms 30272 KB Output is correct
51 Correct 104 ms 35020 KB Output is correct
52 Correct 100 ms 35020 KB Output is correct
53 Correct 114 ms 26456 KB Output is correct
54 Correct 90 ms 26704 KB Output is correct
55 Correct 140 ms 26140 KB Output is correct
56 Correct 177 ms 26144 KB Output is correct
57 Correct 201 ms 26196 KB Output is correct
58 Correct 174 ms 26204 KB Output is correct
59 Correct 141 ms 26352 KB Output is correct
60 Correct 205 ms 26728 KB Output is correct
61 Correct 149 ms 30496 KB Output is correct
62 Correct 140 ms 30568 KB Output is correct
63 Correct 124 ms 30384 KB Output is correct
64 Correct 185 ms 30272 KB Output is correct
65 Correct 149 ms 26260 KB Output is correct
66 Correct 165 ms 26260 KB Output is correct
67 Correct 151 ms 26200 KB Output is correct
68 Correct 113 ms 26708 KB Output is correct
69 Correct 150 ms 26752 KB Output is correct
70 Correct 122 ms 30812 KB Output is correct
71 Correct 146 ms 30184 KB Output is correct
72 Correct 2 ms 6236 KB Output is correct
73 Correct 9 ms 7772 KB Output is correct
74 Correct 11 ms 7772 KB Output is correct
75 Correct 2 ms 6236 KB Output is correct
76 Correct 2 ms 6236 KB Output is correct
77 Correct 9 ms 8280 KB Output is correct
78 Correct 9 ms 8028 KB Output is correct
79 Correct 7 ms 7772 KB Output is correct
80 Correct 17 ms 8136 KB Output is correct
81 Correct 2 ms 6236 KB Output is correct
82 Correct 2 ms 6236 KB Output is correct
83 Correct 2 ms 6236 KB Output is correct
84 Correct 3 ms 6236 KB Output is correct
85 Correct 2 ms 6236 KB Output is correct
86 Correct 19 ms 7984 KB Output is correct
87 Correct 19 ms 8028 KB Output is correct
88 Correct 19 ms 8028 KB Output is correct
89 Correct 10 ms 8280 KB Output is correct
90 Correct 9 ms 7860 KB Output is correct
91 Correct 17 ms 8028 KB Output is correct
92 Correct 18 ms 7824 KB Output is correct
93 Correct 3 ms 6432 KB Output is correct
94 Correct 104 ms 34808 KB Output is correct
95 Correct 95 ms 34512 KB Output is correct
96 Correct 86 ms 34028 KB Output is correct
97 Correct 93 ms 34924 KB Output is correct
98 Correct 104 ms 35020 KB Output is correct
99 Correct 170 ms 26168 KB Output is correct
100 Correct 153 ms 26380 KB Output is correct
101 Correct 193 ms 26220 KB Output is correct
102 Correct 188 ms 26684 KB Output is correct
103 Correct 117 ms 30076 KB Output is correct
104 Correct 123 ms 30668 KB Output is correct
105 Correct 151 ms 30116 KB Output is correct
106 Correct 126 ms 30404 KB Output is correct
107 Correct 158 ms 30288 KB Output is correct
108 Correct 116 ms 35176 KB Output is correct
109 Correct 105 ms 35020 KB Output is correct
110 Correct 111 ms 26704 KB Output is correct
111 Correct 98 ms 26448 KB Output is correct
112 Correct 149 ms 26132 KB Output is correct
113 Correct 146 ms 26168 KB Output is correct