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Submission #534145

# Submission time Handle Problem Language Result Execution time Memory
534145 2022-03-08T01:37:11 Z xuliu Railway (BOI17_railway) C++17
100 / 100
 108 ms 27640 KB 
#include <bits/stdc++.h>

using namespace std;

#define ll long long 
#define ld long double 
#define debug if(0)

const int mod = 1e9 + 7;
const ll infL = 1e18 + 7;
const int inf = 1e9 + 7;

const int N = 1e5 + 4, M = 20;
vector<int> V[N];
int tin[N], tout[N], depth[N], jump[N][M], pref[N];
int T = 1;

void dfs(int v, int p=0, int d=0) {
	depth[v] = d+1;
	tin[v] = T++;
	jump[v][0] = p;
	for(int u : V[v]) {
		if(u != p) dfs(u, v, d+1);
	}
	tout[v] = T++;
}

int jmp(int x, int k) {
	for(int i=0; i<M; i++) {
		if((1<<i) & k) x = jump[x][i];
	}
	return x;
}

int lca(int a, int b) {
	if(depth[a] < depth[b]) swap(a, b);
	a = jmp(a, depth[a]-depth[b]);
	if(a == b) return a;
	for(int i=M-1; i>=0; i--) {
		int xa = jump[a][i], xb = jump[b][i];
		if(xa != xb) { a = xa; b = xb; }
	}
	return jump[a][0];
}

int ans[N];
void dfs2(int v, int p=0) {
	ans[v] = pref[v];
	for(int u : V[v]) {
		if(u != p) {
			dfs2(u, v);
			ans[v] += ans[u];
		}
	}
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n, m, k; cin>>n>>m>>k;
	vector<pair<int, int>> E;
	for(int i=1; i<n; i++) {
		int a, b; cin>>a>>b;
		V[a].push_back(b);
		V[b].push_back(a);
		E.push_back({a, b});
	}
	dfs(1);
	for(int j=1; j<M; j++) {
		for(int i=1; i<=n; i++) jump[i][j] = jump[jump[i][j-1]][j-1];
	}
	for(int z=0; z<m; z++) {
		int s; cin>>s;
		vector<pair<int, int>> cc;
		for(int i=0; i<s; i++) {
			int a; cin>>a;
			cc.push_back({tin[a], a});
		}
		sort(cc.begin(), cc.end());
		for(int i=0; i<s; i++) {
			int a = cc[i].second, b = cc[(i+1)%s].second;
			// add on path (a, b) value 1
			int lc = lca(a, b);
			pref[a]++; pref[b]++; pref[lc]-=2;
		}
	}
	dfs2(1);
	vector<int> result;
	for(int i=0; i<(n-1); i++) {
		auto e = E[i];
		int a = e.first, b = e.second;
		if(depth[a] > depth[b]) swap(a, b);
		if(ans[b] >= 2*k) result.push_back(i+1);
		debug cerr<<"ans["<<b<<"] = "<<ans[b]<<"\n";
	}
	cout<<(int) result.size()<<"\n";
	for(int x : result) cout<<x<<" ";
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 6 ms 4092 KB Output is correct
3 Correct 5 ms 4172 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 7 ms 4556 KB Output is correct
7 Correct 6 ms 4172 KB Output is correct
8 Correct 5 ms 4092 KB Output is correct
9 Correct 5 ms 4172 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2672 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 6 ms 4092 KB Output is correct
3 Correct 5 ms 4172 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 7 ms 4556 KB Output is correct
7 Correct 6 ms 4172 KB Output is correct
8 Correct 5 ms 4092 KB Output is correct
9 Correct 5 ms 4172 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2672 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 19 ms 4548 KB Output is correct
16 Correct 20 ms 4476 KB Output is correct
17 Correct 20 ms 4548 KB Output is correct
18 Correct 6 ms 4556 KB Output is correct
19 Correct 6 ms 4172 KB Output is correct
20 Correct 27 ms 4676 KB Output is correct
21 Correct 24 ms 4648 KB Output is correct
22 Correct 2 ms 2636 KB Output is correct
23 Correct 6 ms 4172 KB Output is correct
24 Correct 6 ms 4172 KB Output is correct
25 Correct 2 ms 2636 KB Output is correct
26 Correct 2 ms 2676 KB Output is correct
27 Correct 7 ms 4560 KB Output is correct
28 Correct 5 ms 4228 KB Output is correct
29 Correct 5 ms 4096 KB Output is correct
30 Correct 5 ms 4140 KB Output is correct
31 Correct 2 ms 2668 KB Output is correct
32 Correct 2 ms 2672 KB Output is correct
33 Correct 1 ms 2636 KB Output is correct
34 Correct 2 ms 2636 KB Output is correct
35 Correct 2 ms 2636 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 88 ms 25572 KB Output is correct
2 Correct 2 ms 2672 KB Output is correct
3 Correct 88 ms 25028 KB Output is correct
4 Correct 88 ms 24284 KB Output is correct
5 Correct 96 ms 25620 KB Output is correct
6 Correct 77 ms 25700 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 20228 KB Output is correct
2 Correct 86 ms 16916 KB Output is correct
3 Correct 88 ms 16612 KB Output is correct
4 Correct 77 ms 16604 KB Output is correct
5 Correct 79 ms 16568 KB Output is correct
6 Correct 68 ms 20436 KB Output is correct
7 Correct 69 ms 20344 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 20228 KB Output is correct
2 Correct 86 ms 16916 KB Output is correct
3 Correct 88 ms 16612 KB Output is correct
4 Correct 77 ms 16604 KB Output is correct
5 Correct 79 ms 16568 KB Output is correct
6 Correct 68 ms 20436 KB Output is correct
7 Correct 69 ms 20344 KB Output is correct
8 Correct 73 ms 20552 KB Output is correct
9 Correct 73 ms 20532 KB Output is correct
10 Correct 84 ms 25764 KB Output is correct
11 Correct 82 ms 25648 KB Output is correct
12 Correct 62 ms 16920 KB Output is correct
13 Correct 62 ms 16876 KB Output is correct
14 Correct 96 ms 16616 KB Output is correct
15 Correct 84 ms 18136 KB Output is correct
16 Correct 81 ms 18228 KB Output is correct
17 Correct 79 ms 18228 KB Output is correct
18 Correct 97 ms 18256 KB Output is correct
19 Correct 81 ms 18544 KB Output is correct
20 Correct 70 ms 22268 KB Output is correct
21 Correct 70 ms 22436 KB Output is correct
22 Correct 94 ms 22196 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 6 ms 4092 KB Output is correct
3 Correct 5 ms 4172 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 7 ms 4556 KB Output is correct
7 Correct 6 ms 4172 KB Output is correct
8 Correct 5 ms 4092 KB Output is correct
9 Correct 5 ms 4172 KB Output is correct
10 Correct 2 ms 2636 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2672 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 19 ms 4548 KB Output is correct
16 Correct 20 ms 4476 KB Output is correct
17 Correct 20 ms 4548 KB Output is correct
18 Correct 6 ms 4556 KB Output is correct
19 Correct 6 ms 4172 KB Output is correct
20 Correct 27 ms 4676 KB Output is correct
21 Correct 24 ms 4648 KB Output is correct
22 Correct 2 ms 2636 KB Output is correct
23 Correct 6 ms 4172 KB Output is correct
24 Correct 6 ms 4172 KB Output is correct
25 Correct 2 ms 2636 KB Output is correct
26 Correct 2 ms 2676 KB Output is correct
27 Correct 7 ms 4560 KB Output is correct
28 Correct 5 ms 4228 KB Output is correct
29 Correct 5 ms 4096 KB Output is correct
30 Correct 5 ms 4140 KB Output is correct
31 Correct 2 ms 2668 KB Output is correct
32 Correct 2 ms 2672 KB Output is correct
33 Correct 1 ms 2636 KB Output is correct
34 Correct 2 ms 2636 KB Output is correct
35 Correct 2 ms 2636 KB Output is correct
36 Correct 88 ms 25572 KB Output is correct
37 Correct 2 ms 2672 KB Output is correct
38 Correct 88 ms 25028 KB Output is correct
39 Correct 88 ms 24284 KB Output is correct
40 Correct 96 ms 25620 KB Output is correct
41 Correct 77 ms 25700 KB Output is correct
42 Correct 71 ms 20228 KB Output is correct
43 Correct 86 ms 16916 KB Output is correct
44 Correct 88 ms 16612 KB Output is correct
45 Correct 77 ms 16604 KB Output is correct
46 Correct 79 ms 16568 KB Output is correct
47 Correct 68 ms 20436 KB Output is correct
48 Correct 69 ms 20344 KB Output is correct
49 Correct 73 ms 20552 KB Output is correct
50 Correct 73 ms 20532 KB Output is correct
51 Correct 84 ms 25764 KB Output is correct
52 Correct 82 ms 25648 KB Output is correct
53 Correct 62 ms 16920 KB Output is correct
54 Correct 62 ms 16876 KB Output is correct
55 Correct 96 ms 16616 KB Output is correct
56 Correct 84 ms 18136 KB Output is correct
57 Correct 81 ms 18228 KB Output is correct
58 Correct 79 ms 18228 KB Output is correct
59 Correct 97 ms 18256 KB Output is correct
60 Correct 81 ms 18544 KB Output is correct
61 Correct 70 ms 22268 KB Output is correct
62 Correct 70 ms 22436 KB Output is correct
63 Correct 94 ms 22196 KB Output is correct
64 Correct 74 ms 22308 KB Output is correct
65 Correct 90 ms 18192 KB Output is correct
66 Correct 90 ms 18116 KB Output is correct
67 Correct 84 ms 18152 KB Output is correct
68 Correct 65 ms 18100 KB Output is correct
69 Correct 57 ms 17976 KB Output is correct
70 Correct 84 ms 22788 KB Output is correct
71 Correct 73 ms 21984 KB Output is correct
72 Correct 2 ms 2636 KB Output is correct
73 Correct 6 ms 4172 KB Output is correct
74 Correct 5 ms 4172 KB Output is correct
75 Correct 2 ms 2668 KB Output is correct
76 Correct 2 ms 2672 KB Output is correct
77 Correct 9 ms 4580 KB Output is correct
78 Correct 7 ms 4172 KB Output is correct
79 Correct 5 ms 4092 KB Output is correct
80 Correct 5 ms 4172 KB Output is correct
81 Correct 2 ms 2636 KB Output is correct
82 Correct 1 ms 2672 KB Output is correct
83 Correct 2 ms 2668 KB Output is correct
84 Correct 2 ms 2636 KB Output is correct
85 Correct 2 ms 2636 KB Output is correct
86 Correct 20 ms 4476 KB Output is correct
87 Correct 20 ms 4516 KB Output is correct
88 Correct 19 ms 4604 KB Output is correct
89 Correct 7 ms 4556 KB Output is correct
90 Correct 6 ms 4216 KB Output is correct
91 Correct 22 ms 4740 KB Output is correct
92 Correct 22 ms 4584 KB Output is correct
93 Correct 2 ms 2664 KB Output is correct
94 Correct 85 ms 27204 KB Output is correct
95 Correct 88 ms 26680 KB Output is correct
96 Correct 76 ms 25956 KB Output is correct
97 Correct 103 ms 27332 KB Output is correct
98 Correct 81 ms 27640 KB Output is correct
99 Correct 108 ms 18244 KB Output is correct
100 Correct 76 ms 18236 KB Output is correct
101 Correct 97 ms 18264 KB Output is correct
102 Correct 84 ms 18676 KB Output is correct
103 Correct 83 ms 21996 KB Output is correct
104 Correct 69 ms 22460 KB Output is correct
105 Correct 72 ms 21988 KB Output is correct
106 Correct 88 ms 22436 KB Output is correct
107 Correct 75 ms 22108 KB Output is correct
108 Correct 76 ms 27368 KB Output is correct
109 Correct 95 ms 27336 KB Output is correct
110 Correct 71 ms 18152 KB Output is correct
111 Correct 62 ms 18076 KB Output is correct
112 Correct 79 ms 18104 KB Output is correct
113 Correct 88 ms 18140 KB Output is correct