Submission #91040

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
91040	2018-12-25T20:49:41 Z	sjhuang26	Network (BOI15_net)	C++14	63 / 100	832 ms	34832 KB

#include<iostream>
#include<vector>
using namespace std;
vector<int>s;
vector<vector<int>>t;//1 IDX
bool f[500000]={};
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;++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	504 KB	Output is correct
4	Correct	2 ms	544 KB	Output is correct
5	Correct	2 ms	544 KB	Output is correct
6	Correct	2 ms	544 KB	Output is correct
7	Correct	2 ms	544 KB	Output is correct
8	Correct	2 ms	544 KB	Output is correct
9	Correct	2 ms	544 KB	Output is correct
10	Correct	2 ms	544 KB	Output is correct
11	Correct	2 ms	600 KB	Output is correct
12	Correct	2 ms	600 KB	Output is correct
13	Correct	2 ms	608 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	504 KB	Output is correct
4	Correct	2 ms	544 KB	Output is correct
5	Correct	2 ms	544 KB	Output is correct
6	Correct	2 ms	544 KB	Output is correct
7	Correct	2 ms	544 KB	Output is correct
8	Correct	2 ms	544 KB	Output is correct
9	Correct	2 ms	544 KB	Output is correct
10	Correct	2 ms	544 KB	Output is correct
11	Correct	2 ms	600 KB	Output is correct
12	Correct	2 ms	600 KB	Output is correct
13	Correct	2 ms	608 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	736 KB	Output is correct
23	Correct	3 ms	736 KB	Output is correct
24	Correct	3 ms	852 KB	Output is correct
25	Correct	3 ms	852 KB	Output is correct
26	Correct	3 ms	852 KB	Output is correct
27	Correct	3 ms	852 KB	Output is correct
28	Correct	3 ms	852 KB	Output is correct
29	Correct	3 ms	852 KB	Output is correct
30	Correct	2 ms	852 KB	Output is correct
31	Correct	3 ms	852 KB	Output is correct
32	Correct	2 ms	852 KB	Output is correct
33	Correct	2 ms	852 KB	Output is correct
34	Correct	2 ms	852 KB	Output is correct
35	Correct	2 ms	852 KB	Output is correct
36	Correct	2 ms	852 KB	Output is correct
37	Correct	2 ms	852 KB	Output is correct
38	Correct	3 ms	852 KB	Output is correct
39	Correct	2 ms	852 KB	Output is correct
40	Correct	2 ms	852 KB	Output is correct
41	Correct	2 ms	852 KB	Output is correct
42	Correct	2 ms	852 KB	Output is correct
43	Correct	2 ms	852 KB	Output is correct
44	Correct	2 ms	852 KB	Output is correct
45	Correct	2 ms	852 KB	Output is correct
46	Correct	2 ms	852 KB	Output is correct
47	Correct	2 ms	852 KB	Output is correct
48	Correct	2 ms	852 KB	Output is correct
49	Correct	3 ms	852 KB	Output is correct
50	Correct	2 ms	852 KB	Output is correct
51	Correct	2 ms	852 KB	Output is correct
52	Correct	2 ms	852 KB	Output is correct
53	Correct	2 ms	852 KB	Output is correct
54	Correct	2 ms	852 KB	Output is correct
55	Correct	2 ms	852 KB	Output is correct
56	Correct	2 ms	852 KB	Output is correct
57	Correct	2 ms	852 KB	Output is correct
58	Correct	3 ms	852 KB	Output is correct

Subtask #3
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	504 KB	Output is correct
4	Correct	2 ms	544 KB	Output is correct
5	Correct	2 ms	544 KB	Output is correct
6	Correct	2 ms	544 KB	Output is correct
7	Correct	2 ms	544 KB	Output is correct
8	Correct	2 ms	544 KB	Output is correct
9	Correct	2 ms	544 KB	Output is correct
10	Correct	2 ms	544 KB	Output is correct
11	Correct	2 ms	600 KB	Output is correct
12	Correct	2 ms	600 KB	Output is correct
13	Correct	2 ms	608 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	736 KB	Output is correct
23	Correct	3 ms	736 KB	Output is correct
24	Correct	3 ms	852 KB	Output is correct
25	Correct	3 ms	852 KB	Output is correct
26	Correct	3 ms	852 KB	Output is correct
27	Correct	3 ms	852 KB	Output is correct
28	Correct	3 ms	852 KB	Output is correct
29	Correct	3 ms	852 KB	Output is correct
30	Correct	2 ms	852 KB	Output is correct
31	Correct	3 ms	852 KB	Output is correct
32	Correct	2 ms	852 KB	Output is correct
33	Correct	2 ms	852 KB	Output is correct
34	Correct	2 ms	852 KB	Output is correct
35	Correct	2 ms	852 KB	Output is correct
36	Correct	2 ms	852 KB	Output is correct
37	Correct	2 ms	852 KB	Output is correct
38	Correct	3 ms	852 KB	Output is correct
39	Correct	2 ms	852 KB	Output is correct
40	Correct	2 ms	852 KB	Output is correct
41	Correct	2 ms	852 KB	Output is correct
42	Correct	2 ms	852 KB	Output is correct
43	Correct	2 ms	852 KB	Output is correct
44	Correct	2 ms	852 KB	Output is correct
45	Correct	2 ms	852 KB	Output is correct
46	Correct	2 ms	852 KB	Output is correct
47	Correct	2 ms	852 KB	Output is correct
48	Correct	2 ms	852 KB	Output is correct
49	Correct	3 ms	852 KB	Output is correct
50	Correct	2 ms	852 KB	Output is correct
51	Correct	2 ms	852 KB	Output is correct
52	Correct	2 ms	852 KB	Output is correct
53	Correct	2 ms	852 KB	Output is correct
54	Correct	2 ms	852 KB	Output is correct
55	Correct	2 ms	852 KB	Output is correct
56	Correct	2 ms	852 KB	Output is correct
57	Correct	2 ms	852 KB	Output is correct
58	Correct	3 ms	852 KB	Output is correct
59	Correct	708 ms	31688 KB	Output is correct
60	Incorrect	832 ms	34832 KB	Invalid number of links.
61	Halted	0 ms	0 KB	-

Submission #91040

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
0 / 37.0