Submission #303966

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
303966	2020-09-20T20:47:21 Z	Hemimor	Network (BOI15_net)	C++14	100 / 100	1352 ms	47916 KB

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <numeric>
#include <cassert>
#include <vector>
#include <cmath>
#include <queue>
#include <set>
#include <map>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<29;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=998244353;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

int n;
vvi g;
vi a;

void dfs(int v,int p=0){
	if(g[v].size()==1) a.push_back(v);
	for(auto u:g[v]) if(u!=p) dfs(u,v);
}

int main(){
	cin>>n;
	g=vvi(n+1);
	for(int i=1;i<n;i++){
		int u,v;
		cin>>u>>v;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	dfs(1);
	int m=a.size(),sz=(m+1)/2;
	cout<<sz<<endl;
	for(int i=0;i<sz;i++) cout<<a[i]<<' '<<a[i+m/2]<<endl;
}

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	256 KB	Output is correct
2	Correct	1 ms	256 KB	Output is correct
3	Correct	0 ms	256 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	0 ms	256 KB	Output is correct
6	Correct	1 ms	256 KB	Output is correct
7	Correct	0 ms	256 KB	Output is correct
8	Correct	0 ms	256 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	1 ms	256 KB	Output is correct
11	Correct	1 ms	256 KB	Output is correct
12	Correct	0 ms	256 KB	Output is correct
13	Correct	0 ms	256 KB	Output is correct
14	Correct	0 ms	256 KB	Output is correct
15	Correct	0 ms	256 KB	Output is correct
16	Correct	1 ms	256 KB	Output is correct
17	Correct	1 ms	256 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct
19	Correct	0 ms	256 KB	Output is correct
20	Correct	1 ms	256 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	256 KB	Output is correct
2	Correct	1 ms	256 KB	Output is correct
3	Correct	0 ms	256 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	0 ms	256 KB	Output is correct
6	Correct	1 ms	256 KB	Output is correct
7	Correct	0 ms	256 KB	Output is correct
8	Correct	0 ms	256 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	1 ms	256 KB	Output is correct
11	Correct	1 ms	256 KB	Output is correct
12	Correct	0 ms	256 KB	Output is correct
13	Correct	0 ms	256 KB	Output is correct
14	Correct	0 ms	256 KB	Output is correct
15	Correct	0 ms	256 KB	Output is correct
16	Correct	1 ms	256 KB	Output is correct
17	Correct	1 ms	256 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct
19	Correct	0 ms	256 KB	Output is correct
20	Correct	1 ms	256 KB	Output is correct
21	Correct	0 ms	256 KB	Output is correct
22	Correct	5 ms	512 KB	Output is correct
23	Correct	5 ms	512 KB	Output is correct
24	Correct	5 ms	512 KB	Output is correct
25	Correct	4 ms	512 KB	Output is correct
26	Correct	3 ms	384 KB	Output is correct
27	Correct	4 ms	512 KB	Output is correct
28	Correct	4 ms	512 KB	Output is correct
29	Correct	3 ms	384 KB	Output is correct
30	Correct	1 ms	256 KB	Output is correct
31	Correct	4 ms	512 KB	Output is correct
32	Correct	0 ms	256 KB	Output is correct
33	Correct	1 ms	256 KB	Output is correct
34	Correct	0 ms	256 KB	Output is correct
35	Correct	1 ms	384 KB	Output is correct
36	Correct	1 ms	256 KB	Output is correct
37	Correct	1 ms	384 KB	Output is correct
38	Correct	2 ms	384 KB	Output is correct
39	Correct	1 ms	256 KB	Output is correct
40	Correct	1 ms	384 KB	Output is correct
41	Correct	1 ms	256 KB	Output is correct
42	Correct	1 ms	384 KB	Output is correct
43	Correct	2 ms	384 KB	Output is correct
44	Correct	1 ms	256 KB	Output is correct
45	Correct	1 ms	384 KB	Output is correct
46	Correct	2 ms	384 KB	Output is correct
47	Correct	0 ms	256 KB	Output is correct
48	Correct	1 ms	384 KB	Output is correct
49	Correct	3 ms	384 KB	Output is correct
50	Correct	1 ms	256 KB	Output is correct
51	Correct	0 ms	256 KB	Output is correct
52	Correct	1 ms	384 KB	Output is correct
53	Correct	2 ms	384 KB	Output is correct
54	Correct	0 ms	256 KB	Output is correct
55	Correct	1 ms	384 KB	Output is correct
56	Correct	1 ms	384 KB	Output is correct
57	Correct	1 ms	384 KB	Output is correct
58	Correct	5 ms	512 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	256 KB	Output is correct
2	Correct	1 ms	256 KB	Output is correct
3	Correct	0 ms	256 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	0 ms	256 KB	Output is correct
6	Correct	1 ms	256 KB	Output is correct
7	Correct	0 ms	256 KB	Output is correct
8	Correct	0 ms	256 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	1 ms	256 KB	Output is correct
11	Correct	1 ms	256 KB	Output is correct
12	Correct	0 ms	256 KB	Output is correct
13	Correct	0 ms	256 KB	Output is correct
14	Correct	0 ms	256 KB	Output is correct
15	Correct	0 ms	256 KB	Output is correct
16	Correct	1 ms	256 KB	Output is correct
17	Correct	1 ms	256 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct
19	Correct	0 ms	256 KB	Output is correct
20	Correct	1 ms	256 KB	Output is correct
21	Correct	0 ms	256 KB	Output is correct
22	Correct	5 ms	512 KB	Output is correct
23	Correct	5 ms	512 KB	Output is correct
24	Correct	5 ms	512 KB	Output is correct
25	Correct	4 ms	512 KB	Output is correct
26	Correct	3 ms	384 KB	Output is correct
27	Correct	4 ms	512 KB	Output is correct
28	Correct	4 ms	512 KB	Output is correct
29	Correct	3 ms	384 KB	Output is correct
30	Correct	1 ms	256 KB	Output is correct
31	Correct	4 ms	512 KB	Output is correct
32	Correct	0 ms	256 KB	Output is correct
33	Correct	1 ms	256 KB	Output is correct
34	Correct	0 ms	256 KB	Output is correct
35	Correct	1 ms	384 KB	Output is correct
36	Correct	1 ms	256 KB	Output is correct
37	Correct	1 ms	384 KB	Output is correct
38	Correct	2 ms	384 KB	Output is correct
39	Correct	1 ms	256 KB	Output is correct
40	Correct	1 ms	384 KB	Output is correct
41	Correct	1 ms	256 KB	Output is correct
42	Correct	1 ms	384 KB	Output is correct
43	Correct	2 ms	384 KB	Output is correct
44	Correct	1 ms	256 KB	Output is correct
45	Correct	1 ms	384 KB	Output is correct
46	Correct	2 ms	384 KB	Output is correct
47	Correct	0 ms	256 KB	Output is correct
48	Correct	1 ms	384 KB	Output is correct
49	Correct	3 ms	384 KB	Output is correct
50	Correct	1 ms	256 KB	Output is correct
51	Correct	0 ms	256 KB	Output is correct
52	Correct	1 ms	384 KB	Output is correct
53	Correct	2 ms	384 KB	Output is correct
54	Correct	0 ms	256 KB	Output is correct
55	Correct	1 ms	384 KB	Output is correct
56	Correct	1 ms	384 KB	Output is correct
57	Correct	1 ms	384 KB	Output is correct
58	Correct	5 ms	512 KB	Output is correct
59	Correct	1171 ms	34920 KB	Output is correct
60	Correct	1309 ms	38944 KB	Output is correct
61	Correct	1 ms	256 KB	Output is correct
62	Correct	0 ms	256 KB	Output is correct
63	Correct	1050 ms	31336 KB	Output is correct
64	Correct	7 ms	896 KB	Output is correct
65	Correct	33 ms	2808 KB	Output is correct
66	Correct	313 ms	20440 KB	Output is correct
67	Correct	989 ms	47096 KB	Output is correct
68	Correct	1035 ms	47916 KB	Output is correct
69	Correct	34 ms	1536 KB	Output is correct
70	Correct	394 ms	13416 KB	Output is correct
71	Correct	1348 ms	41976 KB	Output is correct
72	Correct	1288 ms	40688 KB	Output is correct
73	Correct	295 ms	10608 KB	Output is correct
74	Correct	1230 ms	37744 KB	Output is correct
75	Correct	129 ms	4984 KB	Output is correct
76	Correct	1352 ms	41620 KB	Output is correct
77	Correct	1342 ms	41692 KB	Output is correct
78	Correct	94 ms	4984 KB	Output is correct
79	Correct	992 ms	45196 KB	Output is correct
80	Correct	8 ms	640 KB	Output is correct
81	Correct	405 ms	13808 KB	Output is correct
82	Correct	1272 ms	39656 KB	Output is correct
83	Correct	1218 ms	37720 KB	Output is correct
84	Correct	1226 ms	37876 KB	Output is correct
85	Correct	1225 ms	37932 KB	Output is correct
86	Correct	1304 ms	39044 KB	Output is correct
87	Correct	1319 ms	38984 KB	Output is correct

Submission #303966

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