Submission #91041

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
91041	2018-12-25T20:51:05 Z	sjhuang26	Network (BOI15_net)	C++14	100 / 100	966 ms	142576 KB

#include<iostream>
#include<vector>
using namespace std;
vector<int>s;
vector<vector<int>>t;//1 IDX
bool f[500005]={};
int N;
void dfs(int u){
	if(f[u])return;
	f[u]=1;
	if(t[u].size()==1)s.push_back(u);
	for(int&i:t[u])dfs(i);
}
int main(){
	cin>>N;
	for(int i=0;i<=N+5;++i)t.push_back(vector<int>());
	for(int i=0;i<N-1;++i){
		int a,b;cin>>a>>b;
		t[a].push_back(b);
		t[b].push_back(a);
	}
	dfs(1);
	int k=s.size();
	if(k%2){
		cout<<k/2+1<<'\n';
		for(int i=0;i<k/2;++i){
			cout<<s[i]<<' '<<s[i+k/2+1]<<'\n';
		}
		cout<<s[k/2]<<' '<<1<<'\n';
	}else{
		cout<<k/2<<'\n';
		for(int i=0;i<k/2;++i){
			cout<<s[i]<<' '<<s[i+k/2]<<'\n';
		}
	}

	// free memory
	vector<vector<int>>().swap(t);
	vector<int>().swap(s);

	return 0;
}

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	480 KB	Output is correct
3	Correct	2 ms	484 KB	Output is correct
4	Correct	2 ms	484 KB	Output is correct
5	Correct	2 ms	484 KB	Output is correct
6	Correct	2 ms	484 KB	Output is correct
7	Correct	2 ms	516 KB	Output is correct
8	Correct	2 ms	516 KB	Output is correct
9	Correct	2 ms	516 KB	Output is correct
10	Correct	2 ms	516 KB	Output is correct
11	Correct	2 ms	516 KB	Output is correct
12	Correct	2 ms	516 KB	Output is correct
13	Correct	2 ms	600 KB	Output is correct
14	Correct	2 ms	608 KB	Output is correct
15	Correct	2 ms	608 KB	Output is correct
16	Correct	2 ms	608 KB	Output is correct
17	Correct	2 ms	608 KB	Output is correct
18	Correct	2 ms	608 KB	Output is correct
19	Correct	2 ms	608 KB	Output is correct
20	Correct	2 ms	608 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	480 KB	Output is correct
3	Correct	2 ms	484 KB	Output is correct
4	Correct	2 ms	484 KB	Output is correct
5	Correct	2 ms	484 KB	Output is correct
6	Correct	2 ms	484 KB	Output is correct
7	Correct	2 ms	516 KB	Output is correct
8	Correct	2 ms	516 KB	Output is correct
9	Correct	2 ms	516 KB	Output is correct
10	Correct	2 ms	516 KB	Output is correct
11	Correct	2 ms	516 KB	Output is correct
12	Correct	2 ms	516 KB	Output is correct
13	Correct	2 ms	600 KB	Output is correct
14	Correct	2 ms	608 KB	Output is correct
15	Correct	2 ms	608 KB	Output is correct
16	Correct	2 ms	608 KB	Output is correct
17	Correct	2 ms	608 KB	Output is correct
18	Correct	2 ms	608 KB	Output is correct
19	Correct	2 ms	608 KB	Output is correct
20	Correct	2 ms	608 KB	Output is correct
21	Correct	2 ms	608 KB	Output is correct
22	Correct	3 ms	732 KB	Output is correct
23	Correct	3 ms	736 KB	Output is correct
24	Correct	3 ms	876 KB	Output is correct
25	Correct	3 ms	876 KB	Output is correct
26	Correct	3 ms	876 KB	Output is correct
27	Correct	3 ms	876 KB	Output is correct
28	Correct	3 ms	876 KB	Output is correct
29	Correct	3 ms	876 KB	Output is correct
30	Correct	2 ms	876 KB	Output is correct
31	Correct	3 ms	876 KB	Output is correct
32	Correct	2 ms	876 KB	Output is correct
33	Correct	2 ms	876 KB	Output is correct
34	Correct	2 ms	876 KB	Output is correct
35	Correct	2 ms	876 KB	Output is correct
36	Correct	2 ms	876 KB	Output is correct
37	Correct	3 ms	876 KB	Output is correct
38	Correct	2 ms	876 KB	Output is correct
39	Correct	2 ms	876 KB	Output is correct
40	Correct	2 ms	876 KB	Output is correct
41	Correct	2 ms	876 KB	Output is correct
42	Correct	2 ms	876 KB	Output is correct
43	Correct	2 ms	876 KB	Output is correct
44	Correct	2 ms	876 KB	Output is correct
45	Correct	2 ms	876 KB	Output is correct
46	Correct	3 ms	876 KB	Output is correct
47	Correct	2 ms	876 KB	Output is correct
48	Correct	2 ms	876 KB	Output is correct
49	Correct	3 ms	876 KB	Output is correct
50	Correct	2 ms	876 KB	Output is correct
51	Correct	2 ms	876 KB	Output is correct
52	Correct	2 ms	876 KB	Output is correct
53	Correct	2 ms	876 KB	Output is correct
54	Correct	1 ms	876 KB	Output is correct
55	Correct	2 ms	876 KB	Output is correct
56	Correct	2 ms	876 KB	Output is correct
57	Correct	2 ms	876 KB	Output is correct
58	Correct	3 ms	876 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	480 KB	Output is correct
3	Correct	2 ms	484 KB	Output is correct
4	Correct	2 ms	484 KB	Output is correct
5	Correct	2 ms	484 KB	Output is correct
6	Correct	2 ms	484 KB	Output is correct
7	Correct	2 ms	516 KB	Output is correct
8	Correct	2 ms	516 KB	Output is correct
9	Correct	2 ms	516 KB	Output is correct
10	Correct	2 ms	516 KB	Output is correct
11	Correct	2 ms	516 KB	Output is correct
12	Correct	2 ms	516 KB	Output is correct
13	Correct	2 ms	600 KB	Output is correct
14	Correct	2 ms	608 KB	Output is correct
15	Correct	2 ms	608 KB	Output is correct
16	Correct	2 ms	608 KB	Output is correct
17	Correct	2 ms	608 KB	Output is correct
18	Correct	2 ms	608 KB	Output is correct
19	Correct	2 ms	608 KB	Output is correct
20	Correct	2 ms	608 KB	Output is correct
21	Correct	2 ms	608 KB	Output is correct
22	Correct	3 ms	732 KB	Output is correct
23	Correct	3 ms	736 KB	Output is correct
24	Correct	3 ms	876 KB	Output is correct
25	Correct	3 ms	876 KB	Output is correct
26	Correct	3 ms	876 KB	Output is correct
27	Correct	3 ms	876 KB	Output is correct
28	Correct	3 ms	876 KB	Output is correct
29	Correct	3 ms	876 KB	Output is correct
30	Correct	2 ms	876 KB	Output is correct
31	Correct	3 ms	876 KB	Output is correct
32	Correct	2 ms	876 KB	Output is correct
33	Correct	2 ms	876 KB	Output is correct
34	Correct	2 ms	876 KB	Output is correct
35	Correct	2 ms	876 KB	Output is correct
36	Correct	2 ms	876 KB	Output is correct
37	Correct	3 ms	876 KB	Output is correct
38	Correct	2 ms	876 KB	Output is correct
39	Correct	2 ms	876 KB	Output is correct
40	Correct	2 ms	876 KB	Output is correct
41	Correct	2 ms	876 KB	Output is correct
42	Correct	2 ms	876 KB	Output is correct
43	Correct	2 ms	876 KB	Output is correct
44	Correct	2 ms	876 KB	Output is correct
45	Correct	2 ms	876 KB	Output is correct
46	Correct	3 ms	876 KB	Output is correct
47	Correct	2 ms	876 KB	Output is correct
48	Correct	2 ms	876 KB	Output is correct
49	Correct	3 ms	876 KB	Output is correct
50	Correct	2 ms	876 KB	Output is correct
51	Correct	2 ms	876 KB	Output is correct
52	Correct	2 ms	876 KB	Output is correct
53	Correct	2 ms	876 KB	Output is correct
54	Correct	1 ms	876 KB	Output is correct
55	Correct	2 ms	876 KB	Output is correct
56	Correct	2 ms	876 KB	Output is correct
57	Correct	2 ms	876 KB	Output is correct
58	Correct	3 ms	876 KB	Output is correct
59	Correct	691 ms	31592 KB	Output is correct
60	Correct	852 ms	34828 KB	Output is correct
61	Correct	2 ms	34828 KB	Output is correct
62	Correct	2 ms	34828 KB	Output is correct
63	Correct	638 ms	34828 KB	Output is correct
64	Correct	6 ms	34828 KB	Output is correct
65	Correct	23 ms	34828 KB	Output is correct
66	Correct	275 ms	34828 KB	Output is correct
67	Correct	853 ms	55700 KB	Output is correct
68	Correct	966 ms	63288 KB	Output is correct
69	Correct	14 ms	63288 KB	Output is correct
70	Correct	193 ms	63288 KB	Output is correct
71	Correct	686 ms	67888 KB	Output is correct
72	Correct	706 ms	73548 KB	Output is correct
73	Correct	185 ms	73548 KB	Output is correct
74	Correct	895 ms	77596 KB	Output is correct
75	Correct	56 ms	77596 KB	Output is correct
76	Correct	727 ms	89736 KB	Output is correct
77	Correct	662 ms	96600 KB	Output is correct
78	Correct	55 ms	96600 KB	Output is correct
79	Correct	794 ms	105500 KB	Output is correct
80	Correct	5 ms	105500 KB	Output is correct
81	Correct	214 ms	105500 KB	Output is correct
82	Correct	793 ms	110336 KB	Output is correct
83	Correct	768 ms	113964 KB	Output is correct
84	Correct	797 ms	120720 KB	Output is correct
85	Correct	729 ms	127304 KB	Output is correct
86	Correct	742 ms	136008 KB	Output is correct
87	Correct	834 ms	142576 KB	Output is correct

Submission #91041

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0