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Submission #298033

# Submission time Handle Problem Language Result Execution time Memory
298033 2020-09-12T10:02:06 Z miss_robot Railway (BOI17_railway) C++14
100 / 100
 370 ms 50164 KB 
#include <bits/stdc++.h>

#pragma GCC optimize("O3")

using namespace std;

const int N = 1e5, L = 17;
int n, m, k;
vector<int> g[N], ind[N], sol, llca[N];
int up[N], p[L][N], h[N];
set<int> qry[N];

void dfs(int u, int l, int d){
	p[0][u] = l;
	h[u] = d++;
	for(int i = 0, v; i < (int)g[u].size(); i++){
		v = g[u][i];
		if(v == l) up[u] = ind[u][i];
		else dfs(v, u, d);
	}
}

int kth(int u, int k){
	for(int i = L-1; i >= 0; i--)
		if(k >= (1<<i))
			k -= (1<<i), u = p[i][u];
	return u;
}

int lca(int u, int v){
	if(h[v] > h[u]) swap(u, v);
	u = kth(u, h[u]-h[v]);
	if(u == v) return u;
	for(int i = L-1; i >= 0; i--)
		if(p[i][u] != p[i][v])
			u = p[i][u], v = p[i][v];
	return p[0][u];
}

void solve(int u){
	for(int v : g[u]){
		if(v == p[0][u]) continue;
		solve(v);
		if(qry[v].size() > qry[u].size()) swap(qry[u], qry[v]);
		qry[u].insert(qry[v].begin(), qry[v].end());
	}
	for(int &x : llca[u]) qry[u].erase(x);
	if((int)qry[u].size() >= k) sol.push_back(up[u]);
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(0);
	cin >> n >> m >> k;
	for(int i = 1, u, v; i < n; i++){
		cin >> u >> v;
		u--, v--;
		g[u].push_back(v);
		g[v].push_back(u);
		ind[u].push_back(i);
		ind[v].push_back(i);
	}
	dfs(0, 0, 0);
	for(int i = 1; i < L; i++)
		for(int j = 0; j < n; j++)
			p[i][j] = p[i-1][p[i-1][j]];
	while(m--){
		int s, a, b;
		cin >> s >> b;
		b--;
		qry[b].insert(m);
		while(--s){
			cin >> a;
			a--;
			b = lca(b, a);
			qry[a].insert(m);
		}
		llca[b].push_back(m);
	}
	solve(0);
	sort(sol.begin(), sol.end());
	cout << sol.size() << "\n";
	for(int &x : sol) cout << x << " ";
	cout << "\n";
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 12160 KB Output is correct
2 Correct 18 ms 13824 KB Output is correct
3 Correct 18 ms 13824 KB Output is correct
4 Correct 11 ms 12160 KB Output is correct
5 Correct 10 ms 12160 KB Output is correct
6 Correct 19 ms 14336 KB Output is correct
7 Correct 18 ms 13824 KB Output is correct
8 Correct 18 ms 13952 KB Output is correct
9 Correct 18 ms 13952 KB Output is correct
10 Correct 11 ms 12160 KB Output is correct
11 Correct 10 ms 12160 KB Output is correct
12 Correct 10 ms 12160 KB Output is correct
13 Correct 10 ms 12160 KB Output is correct
14 Correct 10 ms 12160 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 12160 KB Output is correct
2 Correct 18 ms 13824 KB Output is correct
3 Correct 18 ms 13824 KB Output is correct
4 Correct 11 ms 12160 KB Output is correct
5 Correct 10 ms 12160 KB Output is correct
6 Correct 19 ms 14336 KB Output is correct
7 Correct 18 ms 13824 KB Output is correct
8 Correct 18 ms 13952 KB Output is correct
9 Correct 18 ms 13952 KB Output is correct
10 Correct 11 ms 12160 KB Output is correct
11 Correct 10 ms 12160 KB Output is correct
12 Correct 10 ms 12160 KB Output is correct
13 Correct 10 ms 12160 KB Output is correct
14 Correct 10 ms 12160 KB Output is correct
15 Correct 69 ms 19576 KB Output is correct
16 Correct 70 ms 19704 KB Output is correct
17 Correct 72 ms 19704 KB Output is correct
18 Correct 21 ms 14592 KB Output is correct
19 Correct 21 ms 13952 KB Output is correct
20 Correct 77 ms 19064 KB Output is correct
21 Correct 71 ms 18936 KB Output is correct
22 Correct 10 ms 12160 KB Output is correct
23 Correct 18 ms 13824 KB Output is correct
24 Correct 18 ms 13824 KB Output is correct
25 Correct 11 ms 12160 KB Output is correct
26 Correct 10 ms 12160 KB Output is correct
27 Correct 19 ms 14336 KB Output is correct
28 Correct 18 ms 13824 KB Output is correct
29 Correct 16 ms 13952 KB Output is correct
30 Correct 18 ms 13952 KB Output is correct
31 Correct 10 ms 12160 KB Output is correct
32 Correct 11 ms 12160 KB Output is correct
33 Correct 10 ms 12160 KB Output is correct
34 Correct 10 ms 12160 KB Output is correct
35 Correct 10 ms 12160 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 286 ms 46448 KB Output is correct
2 Correct 10 ms 12160 KB Output is correct
3 Correct 251 ms 46168 KB Output is correct
4 Correct 243 ms 45560 KB Output is correct
5 Correct 169 ms 44528 KB Output is correct
6 Correct 169 ms 47096 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 208 ms 40696 KB Output is correct
2 Correct 279 ms 37752 KB Output is correct
3 Correct 309 ms 43508 KB Output is correct
4 Correct 301 ms 43508 KB Output is correct
5 Correct 308 ms 43616 KB Output is correct
6 Correct 215 ms 41080 KB Output is correct
7 Correct 206 ms 40828 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 208 ms 40696 KB Output is correct
2 Correct 279 ms 37752 KB Output is correct
3 Correct 309 ms 43508 KB Output is correct
4 Correct 301 ms 43508 KB Output is correct
5 Correct 308 ms 43616 KB Output is correct
6 Correct 215 ms 41080 KB Output is correct
7 Correct 206 ms 40828 KB Output is correct
8 Correct 190 ms 39544 KB Output is correct
9 Correct 193 ms 39536 KB Output is correct
10 Correct 138 ms 44276 KB Output is correct
11 Correct 140 ms 44276 KB Output is correct
12 Correct 145 ms 32760 KB Output is correct
13 Correct 148 ms 32760 KB Output is correct
14 Correct 242 ms 38392 KB Output is correct
15 Correct 251 ms 38648 KB Output is correct
16 Correct 310 ms 44512 KB Output is correct
17 Correct 314 ms 44916 KB Output is correct
18 Correct 288 ms 42740 KB Output is correct
19 Correct 294 ms 38392 KB Output is correct
20 Correct 210 ms 41208 KB Output is correct
21 Correct 207 ms 41208 KB Output is correct
22 Correct 224 ms 41336 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 12160 KB Output is correct
2 Correct 18 ms 13824 KB Output is correct
3 Correct 18 ms 13824 KB Output is correct
4 Correct 11 ms 12160 KB Output is correct
5 Correct 10 ms 12160 KB Output is correct
6 Correct 19 ms 14336 KB Output is correct
7 Correct 18 ms 13824 KB Output is correct
8 Correct 18 ms 13952 KB Output is correct
9 Correct 18 ms 13952 KB Output is correct
10 Correct 11 ms 12160 KB Output is correct
11 Correct 10 ms 12160 KB Output is correct
12 Correct 10 ms 12160 KB Output is correct
13 Correct 10 ms 12160 KB Output is correct
14 Correct 10 ms 12160 KB Output is correct
15 Correct 69 ms 19576 KB Output is correct
16 Correct 70 ms 19704 KB Output is correct
17 Correct 72 ms 19704 KB Output is correct
18 Correct 21 ms 14592 KB Output is correct
19 Correct 21 ms 13952 KB Output is correct
20 Correct 77 ms 19064 KB Output is correct
21 Correct 71 ms 18936 KB Output is correct
22 Correct 10 ms 12160 KB Output is correct
23 Correct 18 ms 13824 KB Output is correct
24 Correct 18 ms 13824 KB Output is correct
25 Correct 11 ms 12160 KB Output is correct
26 Correct 10 ms 12160 KB Output is correct
27 Correct 19 ms 14336 KB Output is correct
28 Correct 18 ms 13824 KB Output is correct
29 Correct 16 ms 13952 KB Output is correct
30 Correct 18 ms 13952 KB Output is correct
31 Correct 10 ms 12160 KB Output is correct
32 Correct 11 ms 12160 KB Output is correct
33 Correct 10 ms 12160 KB Output is correct
34 Correct 10 ms 12160 KB Output is correct
35 Correct 10 ms 12160 KB Output is correct
36 Correct 286 ms 46448 KB Output is correct
37 Correct 10 ms 12160 KB Output is correct
38 Correct 251 ms 46168 KB Output is correct
39 Correct 243 ms 45560 KB Output is correct
40 Correct 169 ms 44528 KB Output is correct
41 Correct 169 ms 47096 KB Output is correct
42 Correct 208 ms 40696 KB Output is correct
43 Correct 279 ms 37752 KB Output is correct
44 Correct 309 ms 43508 KB Output is correct
45 Correct 301 ms 43508 KB Output is correct
46 Correct 308 ms 43616 KB Output is correct
47 Correct 215 ms 41080 KB Output is correct
48 Correct 206 ms 40828 KB Output is correct
49 Correct 190 ms 39544 KB Output is correct
50 Correct 193 ms 39536 KB Output is correct
51 Correct 138 ms 44276 KB Output is correct
52 Correct 140 ms 44276 KB Output is correct
53 Correct 145 ms 32760 KB Output is correct
54 Correct 148 ms 32760 KB Output is correct
55 Correct 242 ms 38392 KB Output is correct
56 Correct 251 ms 38648 KB Output is correct
57 Correct 310 ms 44512 KB Output is correct
58 Correct 314 ms 44916 KB Output is correct
59 Correct 288 ms 42740 KB Output is correct
60 Correct 294 ms 38392 KB Output is correct
61 Correct 210 ms 41208 KB Output is correct
62 Correct 207 ms 41208 KB Output is correct
63 Correct 224 ms 41336 KB Output is correct
64 Correct 226 ms 40056 KB Output is correct
65 Correct 370 ms 50164 KB Output is correct
66 Correct 298 ms 45688 KB Output is correct
67 Correct 268 ms 41464 KB Output is correct
68 Correct 135 ms 31224 KB Output is correct
69 Correct 142 ms 31280 KB Output is correct
70 Correct 234 ms 41204 KB Output is correct
71 Correct 196 ms 39416 KB Output is correct
72 Correct 10 ms 12160 KB Output is correct
73 Correct 18 ms 13848 KB Output is correct
74 Correct 18 ms 13824 KB Output is correct
75 Correct 10 ms 12160 KB Output is correct
76 Correct 10 ms 12160 KB Output is correct
77 Correct 19 ms 14336 KB Output is correct
78 Correct 19 ms 13824 KB Output is correct
79 Correct 16 ms 13952 KB Output is correct
80 Correct 18 ms 13952 KB Output is correct
81 Correct 10 ms 12160 KB Output is correct
82 Correct 10 ms 12160 KB Output is correct
83 Correct 9 ms 12160 KB Output is correct
84 Correct 11 ms 12160 KB Output is correct
85 Correct 9 ms 12160 KB Output is correct
86 Correct 66 ms 19576 KB Output is correct
87 Correct 68 ms 19704 KB Output is correct
88 Correct 70 ms 19832 KB Output is correct
89 Correct 20 ms 14592 KB Output is correct
90 Correct 20 ms 13952 KB Output is correct
91 Correct 69 ms 19064 KB Output is correct
92 Correct 73 ms 18936 KB Output is correct
93 Correct 10 ms 12144 KB Output is correct
94 Correct 219 ms 46320 KB Output is correct
95 Correct 247 ms 46068 KB Output is correct
96 Correct 242 ms 45720 KB Output is correct
97 Correct 169 ms 44528 KB Output is correct
98 Correct 168 ms 47012 KB Output is correct
99 Correct 332 ms 47088 KB Output is correct
100 Correct 305 ms 44268 KB Output is correct
101 Correct 306 ms 44792 KB Output is correct
102 Correct 243 ms 38136 KB Output is correct
103 Correct 183 ms 40824 KB Output is correct
104 Correct 215 ms 41208 KB Output is correct
105 Correct 210 ms 40696 KB Output is correct
106 Correct 172 ms 39672 KB Output is correct
107 Correct 167 ms 39544 KB Output is correct
108 Correct 128 ms 44276 KB Output is correct
109 Correct 137 ms 44404 KB Output is correct
110 Correct 148 ms 32848 KB Output is correct
111 Correct 119 ms 32760 KB Output is correct
112 Correct 237 ms 38264 KB Output is correct
113 Correct 269 ms 38264 KB Output is correct