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Submission #502514

# Submission time Handle Problem Language Result Execution time Memory
502514 2022-01-06T07:46:08 Z n00bie_1004 Railway (BOI17_railway) C++17
100 / 100
 122 ms 35896 KB 
#include <bits/stdc++.h>
typedef long long int ll; 

using namespace std;

vector<ll> adj[100005];
ll l = 20; 
ll dp[100005][20]; 
vector<ll> dep(100005); 
ll timer = 0;
vector<ll> tin(100005), tout(100005);
bool comp(ll u, ll v){
    return tin[u] < tin[v]; 
}
void precomp(ll v, ll par){
    dep[v] = dep[par] + 1; 
    dp[v][0] = par;
    for(ll i=1;i<l;i++)
        dp[v][i] = dp[dp[v][i - 1]][i - 1]; 
    tin[v] = ++timer; 
    for(auto u : adj[v])
        if(u != par)
            precomp(u, v); 
    tout[v] = ++timer; 
} 
ll is_ancs(ll u, ll v){
    return tin[u] <= tin[v] && tout[u] >= tout[v];  
}
ll find_LCA(ll u, ll v){
    if(is_ancs(u, v))
        return u;
    if(is_ancs(v, u))
        return v; 
    for(ll i=l-1;i>=0;i--)
        if(dp[u][i] && !is_ancs(dp[u][i], v))
            u = dp[u][i]; 
    return dp[u][0]; 
}
vector<ll> ans(100005); 
void sum(ll v, ll par){
    for(auto u : adj[v]){
        if(u != par){
            sum(u, v); 
            ans[v] += ans[u]; 
        }
    }
}
int main(){ 
    ios_base::sync_with_stdio(false); cin.tie(NULL); 
    ll n, m, k;
    cin >> n >> m >> k;
    vector<ll> u_(n - 1), v_(n - 1); 
    for(ll i=0;i<n-1;i++){
        cin >> u_[i] >> v_[i]; 
        --u_[i]; --v_[i]; 
        adj[u_[i]].push_back(v_[i]); 
        adj[v_[i]].push_back(u_[i]); 
    }
    precomp(0, 0); 
    for(ll i=0;i<m;i++){
        ll s;
        cin >> s;
        vector<ll> vec(s); 
        for(auto &u : vec)
            cin >> u, --u;
        sort(vec.begin(), vec.end(), comp);
        for(ll i=0;i<s;i++){
            ll u = vec[i], v = vec[(i + 1) % s]; 
            ll lca = find_LCA(u, v); 
            ans[u]++; 
            ans[v]++; 
            ans[lca]-=2; 
        }
    }
    sum(0, 0); 
    vector<ll> fin; 
    for(ll i=0;i<n-1;i++){
        ll v = v_[i];  
        if(dep[v_[i]] < dep[u_[i]])
            v = u_[i]; 
        if(ans[v] / 2 >= k){
            fin.push_back(i); 
        }
    }
    cout << fin.size() << "\n"; 
    for(auto &u : fin)
        cout << ++u << " ";
    cout << "\n"; 
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n"; 
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5828 KB Output is correct
2 Correct 8 ms 8004 KB Output is correct
3 Correct 7 ms 8012 KB Output is correct
4 Correct 3 ms 5824 KB Output is correct
5 Correct 2 ms 5836 KB Output is correct
6 Correct 8 ms 8400 KB Output is correct
7 Correct 8 ms 8012 KB Output is correct
8 Correct 9 ms 8012 KB Output is correct
9 Correct 7 ms 8036 KB Output is correct
10 Correct 4 ms 5836 KB Output is correct
11 Correct 3 ms 5820 KB Output is correct
12 Correct 3 ms 5828 KB Output is correct
13 Correct 3 ms 5804 KB Output is correct
14 Correct 3 ms 5816 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5828 KB Output is correct
2 Correct 8 ms 8004 KB Output is correct
3 Correct 7 ms 8012 KB Output is correct
4 Correct 3 ms 5824 KB Output is correct
5 Correct 2 ms 5836 KB Output is correct
6 Correct 8 ms 8400 KB Output is correct
7 Correct 8 ms 8012 KB Output is correct
8 Correct 9 ms 8012 KB Output is correct
9 Correct 7 ms 8036 KB Output is correct
10 Correct 4 ms 5836 KB Output is correct
11 Correct 3 ms 5820 KB Output is correct
12 Correct 3 ms 5828 KB Output is correct
13 Correct 3 ms 5804 KB Output is correct
14 Correct 3 ms 5816 KB Output is correct
15 Correct 24 ms 8368 KB Output is correct
16 Correct 21 ms 8380 KB Output is correct
17 Correct 24 ms 8440 KB Output is correct
18 Correct 11 ms 8396 KB Output is correct
19 Correct 11 ms 8140 KB Output is correct
20 Correct 22 ms 8560 KB Output is correct
21 Correct 19 ms 8400 KB Output is correct
22 Correct 3 ms 5836 KB Output is correct
23 Correct 7 ms 7924 KB Output is correct
24 Correct 8 ms 7920 KB Output is correct
25 Correct 3 ms 5708 KB Output is correct
26 Correct 3 ms 5820 KB Output is correct
27 Correct 12 ms 8344 KB Output is correct
28 Correct 8 ms 8036 KB Output is correct
29 Correct 7 ms 8012 KB Output is correct
30 Correct 7 ms 7960 KB Output is correct
31 Correct 3 ms 5824 KB Output is correct
32 Correct 3 ms 5832 KB Output is correct
33 Correct 3 ms 5836 KB Output is correct
34 Correct 3 ms 5836 KB Output is correct
35 Correct 3 ms 5824 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 35348 KB Output is correct
2 Correct 3 ms 5708 KB Output is correct
3 Correct 70 ms 34960 KB Output is correct
4 Correct 68 ms 34116 KB Output is correct
5 Correct 62 ms 35512 KB Output is correct
6 Correct 67 ms 35896 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 85 ms 31592 KB Output is correct
2 Correct 99 ms 28860 KB Output is correct
3 Correct 95 ms 28508 KB Output is correct
4 Correct 98 ms 28456 KB Output is correct
5 Correct 101 ms 28620 KB Output is correct
6 Correct 81 ms 31836 KB Output is correct
7 Correct 78 ms 31696 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 85 ms 31592 KB Output is correct
2 Correct 99 ms 28860 KB Output is correct
3 Correct 95 ms 28508 KB Output is correct
4 Correct 98 ms 28456 KB Output is correct
5 Correct 101 ms 28620 KB Output is correct
6 Correct 81 ms 31836 KB Output is correct
7 Correct 78 ms 31696 KB Output is correct
8 Correct 107 ms 31788 KB Output is correct
9 Correct 114 ms 31788 KB Output is correct
10 Correct 83 ms 35540 KB Output is correct
11 Correct 64 ms 35548 KB Output is correct
12 Correct 79 ms 28304 KB Output is correct
13 Correct 77 ms 28320 KB Output is correct
14 Correct 96 ms 28348 KB Output is correct
15 Correct 102 ms 28412 KB Output is correct
16 Correct 122 ms 28472 KB Output is correct
17 Correct 112 ms 28476 KB Output is correct
18 Correct 88 ms 28552 KB Output is correct
19 Correct 92 ms 28772 KB Output is correct
20 Correct 81 ms 31968 KB Output is correct
21 Correct 84 ms 32136 KB Output is correct
22 Correct 85 ms 32052 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5828 KB Output is correct
2 Correct 8 ms 8004 KB Output is correct
3 Correct 7 ms 8012 KB Output is correct
4 Correct 3 ms 5824 KB Output is correct
5 Correct 2 ms 5836 KB Output is correct
6 Correct 8 ms 8400 KB Output is correct
7 Correct 8 ms 8012 KB Output is correct
8 Correct 9 ms 8012 KB Output is correct
9 Correct 7 ms 8036 KB Output is correct
10 Correct 4 ms 5836 KB Output is correct
11 Correct 3 ms 5820 KB Output is correct
12 Correct 3 ms 5828 KB Output is correct
13 Correct 3 ms 5804 KB Output is correct
14 Correct 3 ms 5816 KB Output is correct
15 Correct 24 ms 8368 KB Output is correct
16 Correct 21 ms 8380 KB Output is correct
17 Correct 24 ms 8440 KB Output is correct
18 Correct 11 ms 8396 KB Output is correct
19 Correct 11 ms 8140 KB Output is correct
20 Correct 22 ms 8560 KB Output is correct
21 Correct 19 ms 8400 KB Output is correct
22 Correct 3 ms 5836 KB Output is correct
23 Correct 7 ms 7924 KB Output is correct
24 Correct 8 ms 7920 KB Output is correct
25 Correct 3 ms 5708 KB Output is correct
26 Correct 3 ms 5820 KB Output is correct
27 Correct 12 ms 8344 KB Output is correct
28 Correct 8 ms 8036 KB Output is correct
29 Correct 7 ms 8012 KB Output is correct
30 Correct 7 ms 7960 KB Output is correct
31 Correct 3 ms 5824 KB Output is correct
32 Correct 3 ms 5832 KB Output is correct
33 Correct 3 ms 5836 KB Output is correct
34 Correct 3 ms 5836 KB Output is correct
35 Correct 3 ms 5824 KB Output is correct
36 Correct 70 ms 35348 KB Output is correct
37 Correct 3 ms 5708 KB Output is correct
38 Correct 70 ms 34960 KB Output is correct
39 Correct 68 ms 34116 KB Output is correct
40 Correct 62 ms 35512 KB Output is correct
41 Correct 67 ms 35896 KB Output is correct
42 Correct 85 ms 31592 KB Output is correct
43 Correct 99 ms 28860 KB Output is correct
44 Correct 95 ms 28508 KB Output is correct
45 Correct 98 ms 28456 KB Output is correct
46 Correct 101 ms 28620 KB Output is correct
47 Correct 81 ms 31836 KB Output is correct
48 Correct 78 ms 31696 KB Output is correct
49 Correct 107 ms 31788 KB Output is correct
50 Correct 114 ms 31788 KB Output is correct
51 Correct 83 ms 35540 KB Output is correct
52 Correct 64 ms 35548 KB Output is correct
53 Correct 79 ms 28304 KB Output is correct
54 Correct 77 ms 28320 KB Output is correct
55 Correct 96 ms 28348 KB Output is correct
56 Correct 102 ms 28412 KB Output is correct
57 Correct 122 ms 28472 KB Output is correct
58 Correct 112 ms 28476 KB Output is correct
59 Correct 88 ms 28552 KB Output is correct
60 Correct 92 ms 28772 KB Output is correct
61 Correct 81 ms 31968 KB Output is correct
62 Correct 84 ms 32136 KB Output is correct
63 Correct 85 ms 32052 KB Output is correct
64 Correct 94 ms 31944 KB Output is correct
65 Correct 110 ms 28492 KB Output is correct
66 Correct 100 ms 28360 KB Output is correct
67 Correct 96 ms 28508 KB Output is correct
68 Correct 81 ms 28212 KB Output is correct
69 Correct 68 ms 28232 KB Output is correct
70 Correct 95 ms 32316 KB Output is correct
71 Correct 98 ms 31464 KB Output is correct
72 Correct 3 ms 5816 KB Output is correct
73 Correct 7 ms 8012 KB Output is correct
74 Correct 7 ms 8004 KB Output is correct
75 Correct 3 ms 5828 KB Output is correct
76 Correct 3 ms 5824 KB Output is correct
77 Correct 8 ms 8396 KB Output is correct
78 Correct 7 ms 8008 KB Output is correct
79 Correct 7 ms 8012 KB Output is correct
80 Correct 7 ms 8008 KB Output is correct
81 Correct 2 ms 5836 KB Output is correct
82 Correct 3 ms 5828 KB Output is correct
83 Correct 3 ms 5708 KB Output is correct
84 Correct 3 ms 5832 KB Output is correct
85 Correct 3 ms 5836 KB Output is correct
86 Correct 22 ms 8388 KB Output is correct
87 Correct 20 ms 8388 KB Output is correct
88 Correct 20 ms 8524 KB Output is correct
89 Correct 10 ms 8404 KB Output is correct
90 Correct 8 ms 8052 KB Output is correct
91 Correct 17 ms 8516 KB Output is correct
92 Correct 19 ms 8484 KB Output is correct
93 Correct 3 ms 5836 KB Output is correct
94 Correct 64 ms 35388 KB Output is correct
95 Correct 64 ms 34892 KB Output is correct
96 Correct 59 ms 34228 KB Output is correct
97 Correct 63 ms 35372 KB Output is correct
98 Correct 74 ms 35824 KB Output is correct
99 Correct 92 ms 28472 KB Output is correct
100 Correct 90 ms 28460 KB Output is correct
101 Correct 89 ms 28536 KB Output is correct
102 Correct 99 ms 28772 KB Output is correct
103 Correct 79 ms 31708 KB Output is correct
104 Correct 84 ms 32192 KB Output is correct
105 Correct 81 ms 31576 KB Output is correct
106 Correct 96 ms 31872 KB Output is correct
107 Correct 121 ms 31680 KB Output is correct
108 Correct 64 ms 35600 KB Output is correct
109 Correct 65 ms 35500 KB Output is correct
110 Correct 72 ms 28236 KB Output is correct
111 Correct 69 ms 28272 KB Output is correct
112 Correct 103 ms 28356 KB Output is correct
113 Correct 92 ms 28376 KB Output is correct