답안 #655941

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
655941	2022-11-06T06:59:29 Z	aebov	Network (BOI15_net)	C++17	100 / 100	590 ms	40912 KB

#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<utility>
#define pb push_back
#define pii pair<int, int>
#define F first
#define S second
using namespace std;

const int N = (int)5e5 + 5;
int n , u, v, ind[N], _id = 0, root = 1;
vector<int> leafs;
vector<pii> ret;
vector<int> adj[N]; 

void dfs(int v,int p){
	ind[v] = _id ++;
	for(auto u : adj[v])if(u != p)dfs(u , v);
}
int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n;
	for(int i = 1; i < n ; i ++){
		cin >> u >> v;
		adj[u].pb(v);
		adj[v].pb(u);
	}
	for(int i = 1; i <= n; i ++)if(adj[i].size() > 1)root = i;
	dfs(root, root);
	for(int i = 1; i <= n; i ++){
		if(adj[i].size() == 1)ret.pb({ind[i], i});
	}
	sort(ret.begin(), ret.end());
	int sz= ret.size();
	cout << ((sz + 1) >> 1) << endl;
	for(int i = 0; i < sz/2; i ++)	cout << ret[i].S << " " << ret[i + (sz+1)/2].S << endl;
	if(sz&1) cout << ret[sz/2].S << " " << root << endl;
	exit(0);
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	6 ms	11988 KB	Output is correct
3	Correct	8 ms	11988 KB	Output is correct
4	Correct	7 ms	11992 KB	Output is correct
5	Correct	6 ms	11944 KB	Output is correct
6	Correct	6 ms	11988 KB	Output is correct
7	Correct	6 ms	11988 KB	Output is correct
8	Correct	7 ms	11988 KB	Output is correct
9	Correct	9 ms	12032 KB	Output is correct
10	Correct	6 ms	11988 KB	Output is correct
11	Correct	8 ms	11964 KB	Output is correct
12	Correct	6 ms	12040 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	6 ms	11988 KB	Output is correct
15	Correct	7 ms	11988 KB	Output is correct
16	Correct	7 ms	12028 KB	Output is correct
17	Correct	6 ms	12064 KB	Output is correct
18	Correct	6 ms	11988 KB	Output is correct
19	Correct	6 ms	11988 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	6 ms	11988 KB	Output is correct
3	Correct	8 ms	11988 KB	Output is correct
4	Correct	7 ms	11992 KB	Output is correct
5	Correct	6 ms	11944 KB	Output is correct
6	Correct	6 ms	11988 KB	Output is correct
7	Correct	6 ms	11988 KB	Output is correct
8	Correct	7 ms	11988 KB	Output is correct
9	Correct	9 ms	12032 KB	Output is correct
10	Correct	6 ms	11988 KB	Output is correct
11	Correct	8 ms	11964 KB	Output is correct
12	Correct	6 ms	12040 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	6 ms	11988 KB	Output is correct
15	Correct	7 ms	11988 KB	Output is correct
16	Correct	7 ms	12028 KB	Output is correct
17	Correct	6 ms	12064 KB	Output is correct
18	Correct	6 ms	11988 KB	Output is correct
19	Correct	6 ms	11988 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct
21	Correct	6 ms	11988 KB	Output is correct
22	Correct	8 ms	12116 KB	Output is correct
23	Correct	8 ms	12116 KB	Output is correct
24	Correct	8 ms	12116 KB	Output is correct
25	Correct	8 ms	12116 KB	Output is correct
26	Correct	7 ms	12116 KB	Output is correct
27	Correct	8 ms	12116 KB	Output is correct
28	Correct	8 ms	12116 KB	Output is correct
29	Correct	7 ms	12116 KB	Output is correct
30	Correct	6 ms	11988 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	6 ms	11988 KB	Output is correct
33	Correct	7 ms	11972 KB	Output is correct
34	Correct	6 ms	11988 KB	Output is correct
35	Correct	8 ms	12060 KB	Output is correct
36	Correct	8 ms	11988 KB	Output is correct
37	Correct	8 ms	11988 KB	Output is correct
38	Correct	6 ms	12060 KB	Output is correct
39	Correct	6 ms	11988 KB	Output is correct
40	Correct	7 ms	12024 KB	Output is correct
41	Correct	9 ms	11988 KB	Output is correct
42	Correct	8 ms	11988 KB	Output is correct
43	Correct	7 ms	12116 KB	Output is correct
44	Correct	6 ms	11988 KB	Output is correct
45	Correct	7 ms	11988 KB	Output is correct
46	Correct	7 ms	11988 KB	Output is correct
47	Correct	6 ms	11988 KB	Output is correct
48	Correct	6 ms	11988 KB	Output is correct
49	Correct	7 ms	12116 KB	Output is correct
50	Correct	8 ms	11988 KB	Output is correct
51	Correct	6 ms	11988 KB	Output is correct
52	Correct	6 ms	11988 KB	Output is correct
53	Correct	7 ms	12116 KB	Output is correct
54	Correct	6 ms	11988 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	6 ms	11988 KB	Output is correct
57	Correct	6 ms	11988 KB	Output is correct
58	Correct	8 ms	12116 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	6 ms	11988 KB	Output is correct
3	Correct	8 ms	11988 KB	Output is correct
4	Correct	7 ms	11992 KB	Output is correct
5	Correct	6 ms	11944 KB	Output is correct
6	Correct	6 ms	11988 KB	Output is correct
7	Correct	6 ms	11988 KB	Output is correct
8	Correct	7 ms	11988 KB	Output is correct
9	Correct	9 ms	12032 KB	Output is correct
10	Correct	6 ms	11988 KB	Output is correct
11	Correct	8 ms	11964 KB	Output is correct
12	Correct	6 ms	12040 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	6 ms	11988 KB	Output is correct
15	Correct	7 ms	11988 KB	Output is correct
16	Correct	7 ms	12028 KB	Output is correct
17	Correct	6 ms	12064 KB	Output is correct
18	Correct	6 ms	11988 KB	Output is correct
19	Correct	6 ms	11988 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct
21	Correct	6 ms	11988 KB	Output is correct
22	Correct	8 ms	12116 KB	Output is correct
23	Correct	8 ms	12116 KB	Output is correct
24	Correct	8 ms	12116 KB	Output is correct
25	Correct	8 ms	12116 KB	Output is correct
26	Correct	7 ms	12116 KB	Output is correct
27	Correct	8 ms	12116 KB	Output is correct
28	Correct	8 ms	12116 KB	Output is correct
29	Correct	7 ms	12116 KB	Output is correct
30	Correct	6 ms	11988 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	6 ms	11988 KB	Output is correct
33	Correct	7 ms	11972 KB	Output is correct
34	Correct	6 ms	11988 KB	Output is correct
35	Correct	8 ms	12060 KB	Output is correct
36	Correct	8 ms	11988 KB	Output is correct
37	Correct	8 ms	11988 KB	Output is correct
38	Correct	6 ms	12060 KB	Output is correct
39	Correct	6 ms	11988 KB	Output is correct
40	Correct	7 ms	12024 KB	Output is correct
41	Correct	9 ms	11988 KB	Output is correct
42	Correct	8 ms	11988 KB	Output is correct
43	Correct	7 ms	12116 KB	Output is correct
44	Correct	6 ms	11988 KB	Output is correct
45	Correct	7 ms	11988 KB	Output is correct
46	Correct	7 ms	11988 KB	Output is correct
47	Correct	6 ms	11988 KB	Output is correct
48	Correct	6 ms	11988 KB	Output is correct
49	Correct	7 ms	12116 KB	Output is correct
50	Correct	8 ms	11988 KB	Output is correct
51	Correct	6 ms	11988 KB	Output is correct
52	Correct	6 ms	11988 KB	Output is correct
53	Correct	7 ms	12116 KB	Output is correct
54	Correct	6 ms	11988 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	6 ms	11988 KB	Output is correct
57	Correct	6 ms	11988 KB	Output is correct
58	Correct	8 ms	12116 KB	Output is correct
59	Correct	482 ms	32976 KB	Output is correct
60	Correct	547 ms	35320 KB	Output is correct
61	Correct	6 ms	11988 KB	Output is correct
62	Correct	6 ms	11988 KB	Output is correct
63	Correct	485 ms	30952 KB	Output is correct
64	Correct	10 ms	12244 KB	Output is correct
65	Correct	18 ms	13180 KB	Output is correct
66	Correct	102 ms	20812 KB	Output is correct
67	Correct	423 ms	40912 KB	Output is correct
68	Correct	447 ms	37976 KB	Output is correct
69	Correct	22 ms	12936 KB	Output is correct
70	Correct	157 ms	20492 KB	Output is correct
71	Correct	568 ms	38972 KB	Output is correct
72	Correct	536 ms	38100 KB	Output is correct
73	Correct	109 ms	18220 KB	Output is correct
74	Correct	552 ms	33980 KB	Output is correct
75	Correct	58 ms	15016 KB	Output is correct
76	Correct	590 ms	38576 KB	Output is correct
77	Correct	563 ms	39080 KB	Output is correct
78	Correct	35 ms	14676 KB	Output is correct
79	Correct	376 ms	34704 KB	Output is correct
80	Correct	9 ms	12244 KB	Output is correct
81	Correct	160 ms	20356 KB	Output is correct
82	Correct	558 ms	36440 KB	Output is correct
83	Correct	534 ms	34000 KB	Output is correct
84	Correct	531 ms	33980 KB	Output is correct
85	Correct	529 ms	34112 KB	Output is correct
86	Correct	584 ms	35460 KB	Output is correct
87	Correct	558 ms	35496 KB	Output is correct

답안 #655941

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