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Submission #996595

# Submission time Handle Problem Language Result Execution time Memory
996595 2024-06-10T21:37:11 Z MarwenElarbi Railway (BOI17_railway) C++17
100 / 100
 112 ms 29524 KB 
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define ll long long
#define pb push_back
#define ii pair<int,int>
const int nax=2e5+5;
int n,m,k;
vector<pair<int,int>> adj[nax];
int timer=-1;
pair<int,int> tin[nax];
int tab[nax];
int dp[nax][20];
int depth[nax];
int ans[nax];
int pre[nax];
bool compare(int x,int y){
    return tin[x].fi<tin[y].fi;
}
void euler(int x,int p){
    tin[x].fi=++timer;
    for (int i = 1; i < 20; ++i)
    {
        dp[x][i]=dp[dp[x][i-1]][i-1];
    }
    for(auto u:adj[x]){
        if(u.fi==p) continue;
        dp[u.fi][0]=x;
        depth[u.fi]=depth[x]+1;
        euler(u.fi,x);
    }
    tin[x].se=timer;
}
int jump(int x,int d){
    for (int i = 19; i >= 0; --i)
    {
        if(d&(1<<i)) x=dp[x][i];
    }
    return x;
}
int lca(int x,int y){
    if(depth[x]<depth[y]) swap(x,y);
    x=jump(x,depth[x]-depth[y]);
    if(x==y) return x;
    for (int i = 19; i >= 0; --i)
    {
        if(dp[x][i]!=dp[y][i]){
            x=dp[x][i];
            y=dp[y][i];
        }
    }
    return dp[x][0];
}
int res;
void dfs(int x,int p){
    for(auto u:adj[x]){
        if(u.fi==p) continue;
        dfs(u.fi,x);
        if(pre[u.fi]>=2*k){
            ans[u.se]=1;
            res++;
        }
        pre[x]+=pre[u.fi];
    }
    //cout <<x<<" "<<pre[x]<<endl;
}
int main(){
    cin>>n>>m>>k;
    for (int i = 0; i < n-1; ++i)
    {
        int x,y;
        cin>>x>>y;
        x--;y--;
        adj[x].pb({y,i});
        adj[y].pb({x,i});
    }
    euler(0,-1);
    for (int i = 0; i < m; ++i)
    {
        int s;
        cin>>s;
        vector<int> state(s);
        for (int j = 0; j < s; ++j)
        {
            cin>>state[j];
            state[j]--;
        }
        sort(state.begin(),state.end(),compare);
        for (int j = 0; j < s; ++j)
        {
            int l=lca(state[j],state[(j+1)%s]);
            //cout <<state[j]<<" "<<state[(j+1)%s]<<" "<<l<<endl;
            pre[l]-=2;
            pre[state[j]]++;
            pre[state[(j+1)%s]]++;
        }
    }
    dfs(0,-1);
    cout <<res<<endl;
    for (int i = 0; i < n-1; ++i)
    {
        if(ans[i]) cout <<i+1<<" ";
    }
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 7 ms 8028 KB Output is correct
3 Correct 6 ms 8028 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 6 ms 8540 KB Output is correct
7 Correct 7 ms 8308 KB Output is correct
8 Correct 6 ms 8024 KB Output is correct
9 Correct 7 ms 8024 KB Output is correct
10 Correct 1 ms 6844 KB Output is correct
11 Correct 1 ms 6748 KB Output is correct
12 Correct 1 ms 6744 KB Output is correct
13 Correct 1 ms 6748 KB Output is correct
14 Correct 1 ms 6744 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 7 ms 8028 KB Output is correct
3 Correct 6 ms 8028 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 6 ms 8540 KB Output is correct
7 Correct 7 ms 8308 KB Output is correct
8 Correct 6 ms 8024 KB Output is correct
9 Correct 7 ms 8024 KB Output is correct
10 Correct 1 ms 6844 KB Output is correct
11 Correct 1 ms 6748 KB Output is correct
12 Correct 1 ms 6744 KB Output is correct
13 Correct 1 ms 6748 KB Output is correct
14 Correct 1 ms 6744 KB Output is correct
15 Correct 23 ms 8460 KB Output is correct
16 Correct 24 ms 8540 KB Output is correct
17 Correct 25 ms 8540 KB Output is correct
18 Correct 10 ms 8580 KB Output is correct
19 Correct 10 ms 8196 KB Output is correct
20 Correct 35 ms 8788 KB Output is correct
21 Correct 26 ms 8540 KB Output is correct
22 Correct 1 ms 6748 KB Output is correct
23 Correct 7 ms 8280 KB Output is correct
24 Correct 9 ms 8188 KB Output is correct
25 Correct 1 ms 6748 KB Output is correct
26 Correct 1 ms 6748 KB Output is correct
27 Correct 6 ms 8540 KB Output is correct
28 Correct 6 ms 8300 KB Output is correct
29 Correct 5 ms 8080 KB Output is correct
30 Correct 8 ms 8132 KB Output is correct
31 Correct 1 ms 6748 KB Output is correct
32 Correct 1 ms 6744 KB Output is correct
33 Correct 1 ms 6748 KB Output is correct
34 Correct 1 ms 6748 KB Output is correct
35 Correct 1 ms 6748 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 29012 KB Output is correct
2 Correct 1 ms 6744 KB Output is correct
3 Correct 87 ms 28792 KB Output is correct
4 Correct 80 ms 28296 KB Output is correct
5 Correct 94 ms 29008 KB Output is correct
6 Correct 92 ms 29520 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 24952 KB Output is correct
2 Correct 79 ms 21588 KB Output is correct
3 Correct 78 ms 21072 KB Output is correct
4 Correct 81 ms 21072 KB Output is correct
5 Correct 78 ms 21072 KB Output is correct
6 Correct 84 ms 25168 KB Output is correct
7 Correct 84 ms 24916 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 24952 KB Output is correct
2 Correct 79 ms 21588 KB Output is correct
3 Correct 78 ms 21072 KB Output is correct
4 Correct 81 ms 21072 KB Output is correct
5 Correct 78 ms 21072 KB Output is correct
6 Correct 84 ms 25168 KB Output is correct
7 Correct 84 ms 24916 KB Output is correct
8 Correct 87 ms 24996 KB Output is correct
9 Correct 82 ms 25128 KB Output is correct
10 Correct 82 ms 29220 KB Output is correct
11 Correct 81 ms 29268 KB Output is correct
12 Correct 61 ms 20816 KB Output is correct
13 Correct 64 ms 20812 KB Output is correct
14 Correct 77 ms 21076 KB Output is correct
15 Correct 79 ms 21072 KB Output is correct
16 Correct 79 ms 21072 KB Output is correct
17 Correct 85 ms 21080 KB Output is correct
18 Correct 82 ms 21068 KB Output is correct
19 Correct 81 ms 21588 KB Output is correct
20 Correct 79 ms 25156 KB Output is correct
21 Correct 86 ms 25424 KB Output is correct
22 Correct 94 ms 25292 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6744 KB Output is correct
2 Correct 7 ms 8028 KB Output is correct
3 Correct 6 ms 8028 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 6 ms 8540 KB Output is correct
7 Correct 7 ms 8308 KB Output is correct
8 Correct 6 ms 8024 KB Output is correct
9 Correct 7 ms 8024 KB Output is correct
10 Correct 1 ms 6844 KB Output is correct
11 Correct 1 ms 6748 KB Output is correct
12 Correct 1 ms 6744 KB Output is correct
13 Correct 1 ms 6748 KB Output is correct
14 Correct 1 ms 6744 KB Output is correct
15 Correct 23 ms 8460 KB Output is correct
16 Correct 24 ms 8540 KB Output is correct
17 Correct 25 ms 8540 KB Output is correct
18 Correct 10 ms 8580 KB Output is correct
19 Correct 10 ms 8196 KB Output is correct
20 Correct 35 ms 8788 KB Output is correct
21 Correct 26 ms 8540 KB Output is correct
22 Correct 1 ms 6748 KB Output is correct
23 Correct 7 ms 8280 KB Output is correct
24 Correct 9 ms 8188 KB Output is correct
25 Correct 1 ms 6748 KB Output is correct
26 Correct 1 ms 6748 KB Output is correct
27 Correct 6 ms 8540 KB Output is correct
28 Correct 6 ms 8300 KB Output is correct
29 Correct 5 ms 8080 KB Output is correct
30 Correct 8 ms 8132 KB Output is correct
31 Correct 1 ms 6748 KB Output is correct
32 Correct 1 ms 6744 KB Output is correct
33 Correct 1 ms 6748 KB Output is correct
34 Correct 1 ms 6748 KB Output is correct
35 Correct 1 ms 6748 KB Output is correct
36 Correct 84 ms 29012 KB Output is correct
37 Correct 1 ms 6744 KB Output is correct
38 Correct 87 ms 28792 KB Output is correct
39 Correct 80 ms 28296 KB Output is correct
40 Correct 94 ms 29008 KB Output is correct
41 Correct 92 ms 29520 KB Output is correct
42 Correct 75 ms 24952 KB Output is correct
43 Correct 79 ms 21588 KB Output is correct
44 Correct 78 ms 21072 KB Output is correct
45 Correct 81 ms 21072 KB Output is correct
46 Correct 78 ms 21072 KB Output is correct
47 Correct 84 ms 25168 KB Output is correct
48 Correct 84 ms 24916 KB Output is correct
49 Correct 87 ms 24996 KB Output is correct
50 Correct 82 ms 25128 KB Output is correct
51 Correct 82 ms 29220 KB Output is correct
52 Correct 81 ms 29268 KB Output is correct
53 Correct 61 ms 20816 KB Output is correct
54 Correct 64 ms 20812 KB Output is correct
55 Correct 77 ms 21076 KB Output is correct
56 Correct 79 ms 21072 KB Output is correct
57 Correct 79 ms 21072 KB Output is correct
58 Correct 85 ms 21080 KB Output is correct
59 Correct 82 ms 21068 KB Output is correct
60 Correct 81 ms 21588 KB Output is correct
61 Correct 79 ms 25156 KB Output is correct
62 Correct 86 ms 25424 KB Output is correct
63 Correct 94 ms 25292 KB Output is correct
64 Correct 79 ms 25168 KB Output is correct
65 Correct 78 ms 21072 KB Output is correct
66 Correct 83 ms 21076 KB Output is correct
67 Correct 109 ms 21072 KB Output is correct
68 Correct 59 ms 20816 KB Output is correct
69 Correct 56 ms 20820 KB Output is correct
70 Correct 85 ms 25432 KB Output is correct
71 Correct 79 ms 24916 KB Output is correct
72 Correct 1 ms 6748 KB Output is correct
73 Correct 6 ms 8028 KB Output is correct
74 Correct 8 ms 8028 KB Output is correct
75 Correct 1 ms 6748 KB Output is correct
76 Correct 1 ms 6748 KB Output is correct
77 Correct 7 ms 8536 KB Output is correct
78 Correct 7 ms 8284 KB Output is correct
79 Correct 5 ms 8028 KB Output is correct
80 Correct 8 ms 8124 KB Output is correct
81 Correct 1 ms 6840 KB Output is correct
82 Correct 1 ms 6748 KB Output is correct
83 Correct 2 ms 6744 KB Output is correct
84 Correct 1 ms 6748 KB Output is correct
85 Correct 2 ms 6748 KB Output is correct
86 Correct 24 ms 8544 KB Output is correct
87 Correct 24 ms 8528 KB Output is correct
88 Correct 26 ms 8796 KB Output is correct
89 Correct 7 ms 8536 KB Output is correct
90 Correct 7 ms 8284 KB Output is correct
91 Correct 24 ms 8656 KB Output is correct
92 Correct 30 ms 8540 KB Output is correct
93 Correct 1 ms 6748 KB Output is correct
94 Correct 111 ms 29076 KB Output is correct
95 Correct 88 ms 28696 KB Output is correct
96 Correct 85 ms 28248 KB Output is correct
97 Correct 81 ms 29012 KB Output is correct
98 Correct 89 ms 29524 KB Output is correct
99 Correct 79 ms 21052 KB Output is correct
100 Correct 80 ms 21080 KB Output is correct
101 Correct 82 ms 21072 KB Output is correct
102 Correct 112 ms 21584 KB Output is correct
103 Correct 88 ms 24944 KB Output is correct
104 Correct 79 ms 25268 KB Output is correct
105 Correct 80 ms 24916 KB Output is correct
106 Correct 98 ms 25256 KB Output is correct
107 Correct 80 ms 24912 KB Output is correct
108 Correct 83 ms 29268 KB Output is correct
109 Correct 79 ms 29068 KB Output is correct
110 Correct 62 ms 20820 KB Output is correct
111 Correct 65 ms 20820 KB Output is correct
112 Correct 75 ms 21052 KB Output is correct
113 Correct 82 ms 21072 KB Output is correct