oj.uz

Submission #605276

# Submission time Handle Problem Language Result Execution time Memory
605276 2022-07-25T14:58:28 Z czhang2718 Railway (BOI17_railway) C++17
100 / 100
 120 ms 26032 KB 
#include "bits/stdc++.h"
using namespace std;
 
#define rep(i,a,b) for(int i=a; i<=b; i++)
 
const int N=1e5, K=18;
int n, t;
vector<pair<int,int>> adj[N];
int tin[N], tout[N];
int ans[N];
int par[N][K];
int up[N];
 
void dfs(int x){
    tin[x]=++t;
    for(int i=1; i<K; i++) par[x][i]=par[par[x][i-1]][i-1];
    for(auto e:adj[x]){
        int k=e.first;
        if(k==par[x][0]) continue;
        par[k][0]=x;
        up[k]=e.second;
        dfs(k);
    }
    tout[x]=++t;
}
 
bool anc(int u, int v){ return tin[u]<=tin[v] && tout[u]>=tout[v]; }
 
int lca(int u, int v){
    if(anc(u,v)) return u;
    for(int k=K-1; k>=0; k--){
        if(!anc(par[u][k], v)) u=par[u][k];
    }
    return par[u][0];
}
 
void dfs2(int x){
    // cout << "to_add[" << x << "] " << ans[x] << "\n";
    for(auto e:adj[x]){
        int k=e.first;
        if(k==par[x][0]) continue;
        dfs2(k);
        ans[x]+=ans[k];
    }
}
 
int main(){
    cin.tie(0)->sync_with_stdio(0);
    
    int k, m;
    cin >> n >> m >> k;

    vector<vector<int>> nodes(m);
    
    for(int i=1; i<n; i++){
        int u,v; cin >> u >> v;
        u--, v--;
        adj[u].push_back({v, i});
        adj[v].push_back({u, i});
    }

    for(int i=0; i<m; i++){
        int cnt; cin >> cnt;
        while(cnt--){
            int x; cin >> x;
            nodes[i].push_back(x-1);
        }
    }
 
    dfs(0);
 
    for(int c=0; c<m; c++){
        sort(nodes[c].begin(), nodes[c].end(), [&](int i, int j){
            return tin[i]<tin[j]; 
        });
        for(int j=0; j<nodes[c].size(); j++){
            int x=nodes[c][j];
            int prv=nodes[c][(nodes[c].size()+j-1)%(nodes[c].size())];
            ans[x]++;
            ans[lca(prv, x)]--;
        }
    }
 
    dfs2(0);
    vector<int> v;
    for(int i=1; i<n; i++){
        if(ans[i]>=k) v.push_back(up[i]);
    }
    cout << v.size() << "\n";
    sort(v.begin(), v.end());
    for(int x:v) cout << x << " ";
}

Compilation message

railway.cpp: In function 'int main()':
railway.cpp:76:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         for(int j=0; j<nodes[c].size(); j++){
      |                      ~^~~~~~~~~~~~~~~~

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 3976 KB Output is correct
3 Correct 6 ms 4008 KB Output is correct
4 Correct 2 ms 2680 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 6 ms 4356 KB Output is correct
7 Correct 6 ms 4096 KB Output is correct
8 Correct 5 ms 4052 KB Output is correct
9 Correct 6 ms 4120 KB Output is correct
10 Correct 2 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 2680 KB Output is correct
14 Correct 2 ms 2644 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 3976 KB Output is correct
3 Correct 6 ms 4008 KB Output is correct
4 Correct 2 ms 2680 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 6 ms 4356 KB Output is correct
7 Correct 6 ms 4096 KB Output is correct
8 Correct 5 ms 4052 KB Output is correct
9 Correct 6 ms 4120 KB Output is correct
10 Correct 2 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 2680 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 20 ms 4948 KB Output is correct
16 Correct 21 ms 4948 KB Output is correct
17 Correct 23 ms 4968 KB Output is correct
18 Correct 6 ms 4484 KB Output is correct
19 Correct 6 ms 4096 KB Output is correct
20 Correct 28 ms 5040 KB Output is correct
21 Correct 30 ms 4948 KB Output is correct
22 Correct 2 ms 2644 KB Output is correct
23 Correct 6 ms 3992 KB Output is correct
24 Correct 5 ms 4016 KB Output is correct
25 Correct 2 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 6 ms 4436 KB Output is correct
28 Correct 6 ms 4052 KB Output is correct
29 Correct 5 ms 4052 KB Output is correct
30 Correct 5 ms 4040 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 2 ms 2592 KB Output is correct
33 Correct 2 ms 2728 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 100 ms 24260 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 89 ms 23964 KB Output is correct
4 Correct 95 ms 23300 KB Output is correct
5 Correct 69 ms 22384 KB Output is correct
6 Correct 76 ms 22432 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 20684 KB Output is correct
2 Correct 86 ms 17968 KB Output is correct
3 Correct 100 ms 17716 KB Output is correct
4 Correct 105 ms 17740 KB Output is correct
5 Correct 107 ms 17660 KB Output is correct
6 Correct 78 ms 20820 KB Output is correct
7 Correct 72 ms 20824 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 20684 KB Output is correct
2 Correct 86 ms 17968 KB Output is correct
3 Correct 100 ms 17716 KB Output is correct
4 Correct 105 ms 17740 KB Output is correct
5 Correct 107 ms 17660 KB Output is correct
6 Correct 78 ms 20820 KB Output is correct
7 Correct 72 ms 20824 KB Output is correct
8 Correct 78 ms 19732 KB Output is correct
9 Correct 87 ms 19784 KB Output is correct
10 Correct 63 ms 22212 KB Output is correct
11 Correct 63 ms 22068 KB Output is correct
12 Correct 64 ms 15572 KB Output is correct
13 Correct 63 ms 16972 KB Output is correct
14 Correct 88 ms 17532 KB Output is correct
15 Correct 94 ms 17528 KB Output is correct
16 Correct 120 ms 19532 KB Output is correct
17 Correct 97 ms 19452 KB Output is correct
18 Correct 99 ms 19540 KB Output is correct
19 Correct 102 ms 19760 KB Output is correct
20 Correct 80 ms 23088 KB Output is correct
21 Correct 89 ms 23040 KB Output is correct
22 Correct 80 ms 22860 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 3976 KB Output is correct
3 Correct 6 ms 4008 KB Output is correct
4 Correct 2 ms 2680 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 6 ms 4356 KB Output is correct
7 Correct 6 ms 4096 KB Output is correct
8 Correct 5 ms 4052 KB Output is correct
9 Correct 6 ms 4120 KB Output is correct
10 Correct 2 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 2680 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 20 ms 4948 KB Output is correct
16 Correct 21 ms 4948 KB Output is correct
17 Correct 23 ms 4968 KB Output is correct
18 Correct 6 ms 4484 KB Output is correct
19 Correct 6 ms 4096 KB Output is correct
20 Correct 28 ms 5040 KB Output is correct
21 Correct 30 ms 4948 KB Output is correct
22 Correct 2 ms 2644 KB Output is correct
23 Correct 6 ms 3992 KB Output is correct
24 Correct 5 ms 4016 KB Output is correct
25 Correct 2 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 6 ms 4436 KB Output is correct
28 Correct 6 ms 4052 KB Output is correct
29 Correct 5 ms 4052 KB Output is correct
30 Correct 5 ms 4040 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 2 ms 2592 KB Output is correct
33 Correct 2 ms 2728 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct
36 Correct 100 ms 24260 KB Output is correct
37 Correct 1 ms 2644 KB Output is correct
38 Correct 89 ms 23964 KB Output is correct
39 Correct 95 ms 23300 KB Output is correct
40 Correct 69 ms 22384 KB Output is correct
41 Correct 76 ms 22432 KB Output is correct
42 Correct 77 ms 20684 KB Output is correct
43 Correct 86 ms 17968 KB Output is correct
44 Correct 100 ms 17716 KB Output is correct
45 Correct 105 ms 17740 KB Output is correct
46 Correct 107 ms 17660 KB Output is correct
47 Correct 78 ms 20820 KB Output is correct
48 Correct 72 ms 20824 KB Output is correct
49 Correct 78 ms 19732 KB Output is correct
50 Correct 87 ms 19784 KB Output is correct
51 Correct 63 ms 22212 KB Output is correct
52 Correct 63 ms 22068 KB Output is correct
53 Correct 64 ms 15572 KB Output is correct
54 Correct 63 ms 16972 KB Output is correct
55 Correct 88 ms 17532 KB Output is correct
56 Correct 94 ms 17528 KB Output is correct
57 Correct 120 ms 19532 KB Output is correct
58 Correct 97 ms 19452 KB Output is correct
59 Correct 99 ms 19540 KB Output is correct
60 Correct 102 ms 19760 KB Output is correct
61 Correct 80 ms 23088 KB Output is correct
62 Correct 89 ms 23040 KB Output is correct
63 Correct 80 ms 22860 KB Output is correct
64 Correct 88 ms 22808 KB Output is correct
65 Correct 99 ms 19436 KB Output is correct
66 Correct 102 ms 17596 KB Output is correct
67 Correct 92 ms 17568 KB Output is correct
68 Correct 64 ms 16800 KB Output is correct
69 Correct 64 ms 16804 KB Output is correct
70 Correct 89 ms 23120 KB Output is correct
71 Correct 91 ms 21456 KB Output is correct
72 Correct 2 ms 2644 KB Output is correct
73 Correct 6 ms 4052 KB Output is correct
74 Correct 6 ms 3972 KB Output is correct
75 Correct 2 ms 2644 KB Output is correct
76 Correct 1 ms 2680 KB Output is correct
77 Correct 6 ms 4352 KB Output is correct
78 Correct 6 ms 4052 KB Output is correct
79 Correct 5 ms 3976 KB Output is correct
80 Correct 5 ms 4052 KB Output is correct
81 Correct 2 ms 2644 KB Output is correct
82 Correct 1 ms 2644 KB Output is correct
83 Correct 1 ms 2644 KB Output is correct
84 Correct 2 ms 2644 KB Output is correct
85 Correct 2 ms 2648 KB Output is correct
86 Correct 21 ms 4896 KB Output is correct
87 Correct 23 ms 4980 KB Output is correct
88 Correct 23 ms 4996 KB Output is correct
89 Correct 7 ms 4460 KB Output is correct
90 Correct 6 ms 4052 KB Output is correct
91 Correct 27 ms 5040 KB Output is correct
92 Correct 28 ms 4948 KB Output is correct
93 Correct 1 ms 2644 KB Output is correct
94 Correct 91 ms 26032 KB Output is correct
95 Correct 107 ms 25748 KB Output is correct
96 Correct 111 ms 25236 KB Output is correct
97 Correct 61 ms 24132 KB Output is correct
98 Correct 63 ms 24540 KB Output is correct
99 Correct 99 ms 19464 KB Output is correct
100 Correct 118 ms 19452 KB Output is correct
101 Correct 92 ms 19548 KB Output is correct
102 Correct 91 ms 19788 KB Output is correct
103 Correct 74 ms 22672 KB Output is correct
104 Correct 82 ms 22996 KB Output is correct
105 Correct 99 ms 22708 KB Output is correct
106 Correct 88 ms 21708 KB Output is correct
107 Correct 78 ms 21480 KB Output is correct
108 Correct 57 ms 23868 KB Output is correct
109 Correct 56 ms 23876 KB Output is correct
110 Correct 78 ms 16988 KB Output is correct
111 Correct 90 ms 16948 KB Output is correct
112 Correct 96 ms 17460 KB Output is correct
113 Correct 84 ms 17548 KB Output is correct