Submission #390218

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
390218	2021-04-15T15:20:24 Z	ritul_kr_singh	Network (BOI15_net)	C++17	100 / 100	516 ms	43280 KB

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define sp << ' ' <<
#define nl << '\n'

vector<vector<int>> g;
vector<int> leaves;

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

signed main(){
	cin.tie(0)->sync_with_stdio(0);
	int n, a, b; cin >> n;
	g.resize(n);
	for(int i=1; i<n; ++i){
		cin >> a >> b; --a, --b;
		g[a].push_back(b);
		g[b].push_back(a);
	}
	dfs(0, 0);
	int c = leaves.size();
	cout << (c+1)/2 nl;
	for(int i=0; i<c/2; ++i) cout << leaves[i]+1 sp leaves[i+c/2]+1 nl;
	if(c & 1) cout << leaves[0]+1 sp leaves[c-1]+1 nl;
}

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	316 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	1 ms	312 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	316 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	1 ms	312 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	208 KB	Output is correct
22	Correct	1 ms	460 KB	Output is correct
23	Correct	2 ms	452 KB	Output is correct
24	Correct	1 ms	460 KB	Output is correct
25	Correct	1 ms	460 KB	Output is correct
26	Correct	1 ms	332 KB	Output is correct
27	Correct	1 ms	460 KB	Output is correct
28	Correct	1 ms	460 KB	Output is correct
29	Correct	1 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	1 ms	460 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	204 KB	Output is correct
34	Correct	1 ms	404 KB	Output is correct
35	Correct	1 ms	204 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	1 ms	336 KB	Output is correct
39	Correct	1 ms	316 KB	Output is correct
40	Correct	1 ms	204 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	332 KB	Output is correct
44	Correct	1 ms	204 KB	Output is correct
45	Correct	1 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	204 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	1 ms	204 KB	Output is correct
51	Correct	1 ms	204 KB	Output is correct
52	Correct	1 ms	332 KB	Output is correct
53	Correct	1 ms	332 KB	Output is correct
54	Correct	2 ms	204 KB	Output is correct
55	Correct	1 ms	332 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	332 KB	Output is correct
58	Correct	1 ms	460 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	316 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	1 ms	312 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	208 KB	Output is correct
22	Correct	1 ms	460 KB	Output is correct
23	Correct	2 ms	452 KB	Output is correct
24	Correct	1 ms	460 KB	Output is correct
25	Correct	1 ms	460 KB	Output is correct
26	Correct	1 ms	332 KB	Output is correct
27	Correct	1 ms	460 KB	Output is correct
28	Correct	1 ms	460 KB	Output is correct
29	Correct	1 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	1 ms	460 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	204 KB	Output is correct
34	Correct	1 ms	404 KB	Output is correct
35	Correct	1 ms	204 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	1 ms	336 KB	Output is correct
39	Correct	1 ms	316 KB	Output is correct
40	Correct	1 ms	204 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	332 KB	Output is correct
44	Correct	1 ms	204 KB	Output is correct
45	Correct	1 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	204 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	1 ms	204 KB	Output is correct
51	Correct	1 ms	204 KB	Output is correct
52	Correct	1 ms	332 KB	Output is correct
53	Correct	1 ms	332 KB	Output is correct
54	Correct	2 ms	204 KB	Output is correct
55	Correct	1 ms	332 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	332 KB	Output is correct
58	Correct	1 ms	460 KB	Output is correct
59	Correct	370 ms	34740 KB	Output is correct
60	Correct	468 ms	38060 KB	Output is correct
61	Correct	1 ms	204 KB	Output is correct
62	Correct	1 ms	204 KB	Output is correct
63	Correct	322 ms	30504 KB	Output is correct
64	Correct	2 ms	844 KB	Output is correct
65	Correct	11 ms	2764 KB	Output is correct
66	Correct	129 ms	19456 KB	Output is correct
67	Correct	510 ms	41676 KB	Output is correct
68	Correct	516 ms	43280 KB	Output is correct
69	Correct	6 ms	1740 KB	Output is correct
70	Correct	87 ms	14568 KB	Output is correct
71	Correct	321 ms	40420 KB	Output is correct
72	Correct	353 ms	39356 KB	Output is correct
73	Correct	86 ms	11196 KB	Output is correct
74	Correct	475 ms	35904 KB	Output is correct
75	Correct	25 ms	5180 KB	Output is correct
76	Correct	320 ms	39920 KB	Output is correct
77	Correct	314 ms	40344 KB	Output is correct
78	Correct	25 ms	5188 KB	Output is correct
79	Correct	499 ms	39920 KB	Output is correct
80	Correct	2 ms	588 KB	Output is correct
81	Correct	102 ms	14024 KB	Output is correct
82	Correct	393 ms	38196 KB	Output is correct
83	Correct	455 ms	36096 KB	Output is correct
84	Correct	451 ms	35820 KB	Output is correct
85	Correct	513 ms	35800 KB	Output is correct
86	Correct	457 ms	38056 KB	Output is correct
87	Correct	470 ms	38132 KB	Output is correct

Submission #390218

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