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Submission #684653

# Submission time Handle Problem Language Result Execution time Memory
684653 2023-01-22T09:22:09 Z matu Railway (BOI17_railway) C++14
100 / 100
 197 ms 26032 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 1;
int n, m, k, cnt;
vector<pair<int, int>> g[N];
int up[N][20], tin[N], tout[N], mars[N];
int t[N];
bool cmp(int u, int v){
	return tin[u] < tin[v];
}
void dfs(int nod = 1, int p = 1){
	tin[nod] = ++cnt;
	up[nod][0] = p;

	for(int i = 1; i < 20; i++){
		up[nod][i] = up[up[nod][i - 1]][i - 1];
	}
	for(auto i : g[nod]){
		if(i.first != p){
			dfs(i.first, nod);
			t[i.first] = i.second;
		}
	}
	tout[nod] = ++cnt;
}	
bool is_ancestor(int u, int v){
	return tin[u] <= tin[v] && tout[u] >= tout[v];
}
int lca(int u, int v){
	if(is_ancestor(u, v)) return u;
	if(is_ancestor(v, u)) return v;

	for(int i = 19; i >= 0; i--){
		if(!is_ancestor(up[u][i], v)){
			u = up[u][i];
		}
	}
	return up[u][0];
}

void dfs1(int nod = 1, int p = 1){
	//cout << nod << " " << p << '\n';
	for(auto i : g[nod]){
		if(i.first != p){
			dfs1(i.first, nod);
			mars[nod] += mars[i.first];
			
		}
	}
}
int main(){
	
	cin >> n >> m >> k;
	for(int i = 1; i < n; i++){
		int u, v;
		cin >> u >> v;
		g[u].push_back({v, i});
		g[v].push_back({u, i});
	}
	dfs();
	for(int i = 1; i <= m; i++){
		int t;
		cin >> t;
		vector<int> s(t + 10);
		for(int i = 1; i <= t; i++){
			cin >> s[i];
		}
		sort(s.begin() + 1, s.begin() + 1 + t, cmp);
		s[t + 1] = s[1];

		for(int i = 1; i <= t; i++){
			int lc = lca(s[i], s[i + 1]);
			mars[s[i]]++;
			mars[s[i + 1]]++;
			mars[lc]-=2;	
		}
		
	}
	dfs1();
	vector<int> sol;
	for(int i = 2; i <= n; i++){
		if(mars[i] >= 2 * k){
			sol.push_back(t[i]);
		}
	
	}
	cout << sol.size() << '\n';
	sort(sol.begin(), sol.end());
	for(auto i : sol) cout << i << " ";
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2580 KB Output is correct
2 Correct 12 ms 4096 KB Output is correct
3 Correct 10 ms 4044 KB Output is correct
4 Correct 2 ms 2652 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 9 ms 4436 KB Output is correct
7 Correct 9 ms 4072 KB Output is correct
8 Correct 8 ms 4072 KB Output is correct
9 Correct 8 ms 4080 KB Output is correct
10 Correct 2 ms 2648 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 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 2580 KB Output is correct
2 Correct 12 ms 4096 KB Output is correct
3 Correct 10 ms 4044 KB Output is correct
4 Correct 2 ms 2652 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 9 ms 4436 KB Output is correct
7 Correct 9 ms 4072 KB Output is correct
8 Correct 8 ms 4072 KB Output is correct
9 Correct 8 ms 4080 KB Output is correct
10 Correct 2 ms 2648 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 44 ms 4340 KB Output is correct
16 Correct 37 ms 4468 KB Output is correct
17 Correct 37 ms 4444 KB Output is correct
18 Correct 10 ms 4436 KB Output is correct
19 Correct 9 ms 4104 KB Output is correct
20 Correct 44 ms 4572 KB Output is correct
21 Correct 46 ms 4492 KB Output is correct
22 Correct 2 ms 2656 KB Output is correct
23 Correct 9 ms 4052 KB Output is correct
24 Correct 9 ms 4052 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 1 ms 2644 KB Output is correct
27 Correct 10 ms 4436 KB Output is correct
28 Correct 9 ms 4096 KB Output is correct
29 Correct 8 ms 4080 KB Output is correct
30 Correct 19 ms 4052 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 2 ms 2656 KB Output is correct
33 Correct 2 ms 2660 KB Output is correct
34 Correct 1 ms 2644 KB Output is correct
35 Correct 2 ms 2656 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 118 ms 25672 KB Output is correct
2 Correct 2 ms 2772 KB Output is correct
3 Correct 146 ms 25340 KB Output is correct
4 Correct 110 ms 24676 KB Output is correct
5 Correct 117 ms 25672 KB Output is correct
6 Correct 130 ms 26000 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 126 ms 21264 KB Output is correct
2 Correct 141 ms 17944 KB Output is correct
3 Correct 150 ms 17552 KB Output is correct
4 Correct 149 ms 17540 KB Output is correct
5 Correct 151 ms 17536 KB Output is correct
6 Correct 131 ms 21488 KB Output is correct
7 Correct 128 ms 21368 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 126 ms 21264 KB Output is correct
2 Correct 141 ms 17944 KB Output is correct
3 Correct 150 ms 17552 KB Output is correct
4 Correct 149 ms 17540 KB Output is correct
5 Correct 151 ms 17536 KB Output is correct
6 Correct 131 ms 21488 KB Output is correct
7 Correct 128 ms 21368 KB Output is correct
8 Correct 141 ms 21444 KB Output is correct
9 Correct 148 ms 21452 KB Output is correct
10 Correct 111 ms 25784 KB Output is correct
11 Correct 112 ms 25736 KB Output is correct
12 Correct 118 ms 17228 KB Output is correct
13 Correct 118 ms 17240 KB Output is correct
14 Correct 133 ms 17440 KB Output is correct
15 Correct 171 ms 17356 KB Output is correct
16 Correct 149 ms 17556 KB Output is correct
17 Correct 157 ms 17432 KB Output is correct
18 Correct 146 ms 17540 KB Output is correct
19 Correct 157 ms 17836 KB Output is correct
20 Correct 129 ms 21712 KB Output is correct
21 Correct 129 ms 21780 KB Output is correct
22 Correct 124 ms 21728 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2580 KB Output is correct
2 Correct 12 ms 4096 KB Output is correct
3 Correct 10 ms 4044 KB Output is correct
4 Correct 2 ms 2652 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 9 ms 4436 KB Output is correct
7 Correct 9 ms 4072 KB Output is correct
8 Correct 8 ms 4072 KB Output is correct
9 Correct 8 ms 4080 KB Output is correct
10 Correct 2 ms 2648 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 44 ms 4340 KB Output is correct
16 Correct 37 ms 4468 KB Output is correct
17 Correct 37 ms 4444 KB Output is correct
18 Correct 10 ms 4436 KB Output is correct
19 Correct 9 ms 4104 KB Output is correct
20 Correct 44 ms 4572 KB Output is correct
21 Correct 46 ms 4492 KB Output is correct
22 Correct 2 ms 2656 KB Output is correct
23 Correct 9 ms 4052 KB Output is correct
24 Correct 9 ms 4052 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 1 ms 2644 KB Output is correct
27 Correct 10 ms 4436 KB Output is correct
28 Correct 9 ms 4096 KB Output is correct
29 Correct 8 ms 4080 KB Output is correct
30 Correct 19 ms 4052 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 2 ms 2656 KB Output is correct
33 Correct 2 ms 2660 KB Output is correct
34 Correct 1 ms 2644 KB Output is correct
35 Correct 2 ms 2656 KB Output is correct
36 Correct 118 ms 25672 KB Output is correct
37 Correct 2 ms 2772 KB Output is correct
38 Correct 146 ms 25340 KB Output is correct
39 Correct 110 ms 24676 KB Output is correct
40 Correct 117 ms 25672 KB Output is correct
41 Correct 130 ms 26000 KB Output is correct
42 Correct 126 ms 21264 KB Output is correct
43 Correct 141 ms 17944 KB Output is correct
44 Correct 150 ms 17552 KB Output is correct
45 Correct 149 ms 17540 KB Output is correct
46 Correct 151 ms 17536 KB Output is correct
47 Correct 131 ms 21488 KB Output is correct
48 Correct 128 ms 21368 KB Output is correct
49 Correct 141 ms 21444 KB Output is correct
50 Correct 148 ms 21452 KB Output is correct
51 Correct 111 ms 25784 KB Output is correct
52 Correct 112 ms 25736 KB Output is correct
53 Correct 118 ms 17228 KB Output is correct
54 Correct 118 ms 17240 KB Output is correct
55 Correct 133 ms 17440 KB Output is correct
56 Correct 171 ms 17356 KB Output is correct
57 Correct 149 ms 17556 KB Output is correct
58 Correct 157 ms 17432 KB Output is correct
59 Correct 146 ms 17540 KB Output is correct
60 Correct 157 ms 17836 KB Output is correct
61 Correct 129 ms 21712 KB Output is correct
62 Correct 129 ms 21780 KB Output is correct
63 Correct 124 ms 21728 KB Output is correct
64 Correct 142 ms 21648 KB Output is correct
65 Correct 197 ms 17568 KB Output is correct
66 Correct 142 ms 17488 KB Output is correct
67 Correct 143 ms 17416 KB Output is correct
68 Correct 105 ms 17152 KB Output is correct
69 Correct 110 ms 17244 KB Output is correct
70 Correct 137 ms 21960 KB Output is correct
71 Correct 133 ms 21252 KB Output is correct
72 Correct 2 ms 2660 KB Output is correct
73 Correct 12 ms 4064 KB Output is correct
74 Correct 11 ms 4180 KB Output is correct
75 Correct 1 ms 2644 KB Output is correct
76 Correct 2 ms 2652 KB Output is correct
77 Correct 10 ms 4456 KB Output is correct
78 Correct 9 ms 4156 KB Output is correct
79 Correct 8 ms 4080 KB Output is correct
80 Correct 9 ms 4096 KB Output is correct
81 Correct 2 ms 2644 KB Output is correct
82 Correct 2 ms 2644 KB Output is correct
83 Correct 2 ms 2644 KB Output is correct
84 Correct 2 ms 2644 KB Output is correct
85 Correct 2 ms 2644 KB Output is correct
86 Correct 37 ms 4356 KB Output is correct
87 Correct 42 ms 4432 KB Output is correct
88 Correct 38 ms 4432 KB Output is correct
89 Correct 15 ms 4508 KB Output is correct
90 Correct 13 ms 4092 KB Output is correct
91 Correct 45 ms 4624 KB Output is correct
92 Correct 48 ms 4508 KB Output is correct
93 Correct 2 ms 2656 KB Output is correct
94 Correct 118 ms 25680 KB Output is correct
95 Correct 115 ms 25352 KB Output is correct
96 Correct 118 ms 24684 KB Output is correct
97 Correct 117 ms 25644 KB Output is correct
98 Correct 129 ms 26032 KB Output is correct
99 Correct 167 ms 17672 KB Output is correct
100 Correct 150 ms 17544 KB Output is correct
101 Correct 166 ms 17484 KB Output is correct
102 Correct 145 ms 17940 KB Output is correct
103 Correct 127 ms 21452 KB Output is correct
104 Correct 130 ms 21696 KB Output is correct
105 Correct 139 ms 21336 KB Output is correct
106 Correct 138 ms 21568 KB Output is correct
107 Correct 183 ms 21440 KB Output is correct
108 Correct 111 ms 25700 KB Output is correct
109 Correct 112 ms 25728 KB Output is correct
110 Correct 145 ms 17292 KB Output is correct
111 Correct 118 ms 17272 KB Output is correct
112 Correct 144 ms 17376 KB Output is correct
113 Correct 140 ms 17368 KB Output is correct