Submission #765455

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
765455	2023-06-24T13:48:34 Z	vjudge1	Network (BOI15_net)	C++17	100 / 100	398 ms	42312 KB

#include <bits/stdc++.h>
#define int long long
#define ull unsigned long long
#define mps make_pair
#define pb push_back
#define pf push_front
#define F first
#define S second
#define sz(x) (x).size() 
#define all(x) (x).begin(), (x).end()
#define booster ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fopen(s) freopen(s".in","r",stdin);freopen(s".out","w",stdout)
 
using namespace std;

const int N = 5e5 + 123;

int n;

vector <int> v,g[N];

vector <pair<int,int>> pr;

bool used[N];

void dfs(int to){
    used[to] = true;
	if(sz(g[to]) == 1){
		v.pb(to);
	}

	for(auto i : g[to]){
		if(!used[i]){
			dfs(i);
		}
	}
}

signed main()
{ 
	booster

	cin >> n;

	for(int i = 1; i <= n - 1; i++)	{
		int x,y;
		cin >> x >> y;

		g[x].pb(y);
		g[y].pb(x);
	}	

	dfs(1);

	cout << (sz(v) + (sz(v) % 2)) / 2 << '\n';

	for(int i = 0; i < sz(v) / 2; i++){
		cout << v[i] << ' ' << v[i + sz(v) / 2] << '\n';
	}

	if(sz(v) % 2 == 1){
		cout << v[0] << ' ' << v[sz(v) - 1] << '\n';
	}

	return 0;
}
/*

1 2 3 4 5 
0 1 2 3 4

*/

Compilation message

net.cpp: In function 'int main()':
net.cpp:57:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |  for(int i = 0; i < sz(v) / 2; i++){
      |                 ~~^~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	6 ms	12012 KB	Output is correct
3	Correct	6 ms	12064 KB	Output is correct
4	Correct	5 ms	11988 KB	Output is correct
5	Correct	7 ms	11988 KB	Output is correct
6	Correct	7 ms	11988 KB	Output is correct
7	Correct	5 ms	11988 KB	Output is correct
8	Correct	5 ms	11988 KB	Output is correct
9	Correct	5 ms	11988 KB	Output is correct
10	Correct	7 ms	11988 KB	Output is correct
11	Correct	5 ms	11988 KB	Output is correct
12	Correct	6 ms	11988 KB	Output is correct
13	Correct	5 ms	11988 KB	Output is correct
14	Correct	5 ms	11988 KB	Output is correct
15	Correct	5 ms	11988 KB	Output is correct
16	Correct	5 ms	11988 KB	Output is correct
17	Correct	5 ms	11988 KB	Output is correct
18	Correct	5 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

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	6 ms	12012 KB	Output is correct
3	Correct	6 ms	12064 KB	Output is correct
4	Correct	5 ms	11988 KB	Output is correct
5	Correct	7 ms	11988 KB	Output is correct
6	Correct	7 ms	11988 KB	Output is correct
7	Correct	5 ms	11988 KB	Output is correct
8	Correct	5 ms	11988 KB	Output is correct
9	Correct	5 ms	11988 KB	Output is correct
10	Correct	7 ms	11988 KB	Output is correct
11	Correct	5 ms	11988 KB	Output is correct
12	Correct	6 ms	11988 KB	Output is correct
13	Correct	5 ms	11988 KB	Output is correct
14	Correct	5 ms	11988 KB	Output is correct
15	Correct	5 ms	11988 KB	Output is correct
16	Correct	5 ms	11988 KB	Output is correct
17	Correct	5 ms	11988 KB	Output is correct
18	Correct	5 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	7 ms	12060 KB	Output is correct
22	Correct	6 ms	12116 KB	Output is correct
23	Correct	6 ms	12116 KB	Output is correct
24	Correct	6 ms	12116 KB	Output is correct
25	Correct	6 ms	12116 KB	Output is correct
26	Correct	6 ms	12116 KB	Output is correct
27	Correct	6 ms	12116 KB	Output is correct
28	Correct	6 ms	12116 KB	Output is correct
29	Correct	6 ms	12116 KB	Output is correct
30	Correct	6 ms	11988 KB	Output is correct
31	Correct	6 ms	12116 KB	Output is correct
32	Correct	6 ms	11988 KB	Output is correct
33	Correct	5 ms	11988 KB	Output is correct
34	Correct	6 ms	12068 KB	Output is correct
35	Correct	5 ms	11988 KB	Output is correct
36	Correct	6 ms	11988 KB	Output is correct
37	Correct	6 ms	11988 KB	Output is correct
38	Correct	6 ms	12116 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	5 ms	11988 KB	Output is correct
41	Correct	5 ms	11988 KB	Output is correct
42	Correct	6 ms	11988 KB	Output is correct
43	Correct	6 ms	12116 KB	Output is correct
44	Correct	5 ms	12060 KB	Output is correct
45	Correct	8 ms	11988 KB	Output is correct
46	Correct	7 ms	12116 KB	Output is correct
47	Correct	7 ms	11988 KB	Output is correct
48	Correct	6 ms	11988 KB	Output is correct
49	Correct	6 ms	12116 KB	Output is correct
50	Correct	5 ms	11988 KB	Output is correct
51	Correct	5 ms	11988 KB	Output is correct
52	Correct	6 ms	11988 KB	Output is correct
53	Correct	6 ms	12116 KB	Output is correct
54	Correct	7 ms	11988 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	5 ms	11988 KB	Output is correct
57	Correct	6 ms	11988 KB	Output is correct
58	Correct	6 ms	12116 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	6 ms	12012 KB	Output is correct
3	Correct	6 ms	12064 KB	Output is correct
4	Correct	5 ms	11988 KB	Output is correct
5	Correct	7 ms	11988 KB	Output is correct
6	Correct	7 ms	11988 KB	Output is correct
7	Correct	5 ms	11988 KB	Output is correct
8	Correct	5 ms	11988 KB	Output is correct
9	Correct	5 ms	11988 KB	Output is correct
10	Correct	7 ms	11988 KB	Output is correct
11	Correct	5 ms	11988 KB	Output is correct
12	Correct	6 ms	11988 KB	Output is correct
13	Correct	5 ms	11988 KB	Output is correct
14	Correct	5 ms	11988 KB	Output is correct
15	Correct	5 ms	11988 KB	Output is correct
16	Correct	5 ms	11988 KB	Output is correct
17	Correct	5 ms	11988 KB	Output is correct
18	Correct	5 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	7 ms	12060 KB	Output is correct
22	Correct	6 ms	12116 KB	Output is correct
23	Correct	6 ms	12116 KB	Output is correct
24	Correct	6 ms	12116 KB	Output is correct
25	Correct	6 ms	12116 KB	Output is correct
26	Correct	6 ms	12116 KB	Output is correct
27	Correct	6 ms	12116 KB	Output is correct
28	Correct	6 ms	12116 KB	Output is correct
29	Correct	6 ms	12116 KB	Output is correct
30	Correct	6 ms	11988 KB	Output is correct
31	Correct	6 ms	12116 KB	Output is correct
32	Correct	6 ms	11988 KB	Output is correct
33	Correct	5 ms	11988 KB	Output is correct
34	Correct	6 ms	12068 KB	Output is correct
35	Correct	5 ms	11988 KB	Output is correct
36	Correct	6 ms	11988 KB	Output is correct
37	Correct	6 ms	11988 KB	Output is correct
38	Correct	6 ms	12116 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	5 ms	11988 KB	Output is correct
41	Correct	5 ms	11988 KB	Output is correct
42	Correct	6 ms	11988 KB	Output is correct
43	Correct	6 ms	12116 KB	Output is correct
44	Correct	5 ms	12060 KB	Output is correct
45	Correct	8 ms	11988 KB	Output is correct
46	Correct	7 ms	12116 KB	Output is correct
47	Correct	7 ms	11988 KB	Output is correct
48	Correct	6 ms	11988 KB	Output is correct
49	Correct	6 ms	12116 KB	Output is correct
50	Correct	5 ms	11988 KB	Output is correct
51	Correct	5 ms	11988 KB	Output is correct
52	Correct	6 ms	11988 KB	Output is correct
53	Correct	6 ms	12116 KB	Output is correct
54	Correct	7 ms	11988 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	5 ms	11988 KB	Output is correct
57	Correct	6 ms	11988 KB	Output is correct
58	Correct	6 ms	12116 KB	Output is correct
59	Correct	247 ms	35000 KB	Output is correct
60	Correct	294 ms	37292 KB	Output is correct
61	Correct	5 ms	11988 KB	Output is correct
62	Correct	6 ms	11988 KB	Output is correct
63	Correct	181 ms	31824 KB	Output is correct
64	Correct	7 ms	12408 KB	Output is correct
65	Correct	15 ms	13636 KB	Output is correct
66	Correct	68 ms	25756 KB	Output is correct
67	Correct	398 ms	40740 KB	Output is correct
68	Correct	338 ms	42312 KB	Output is correct
69	Correct	10 ms	12940 KB	Output is correct
70	Correct	58 ms	21388 KB	Output is correct
71	Correct	181 ms	39560 KB	Output is correct
72	Correct	197 ms	38452 KB	Output is correct
73	Correct	67 ms	18552 KB	Output is correct
74	Correct	297 ms	35044 KB	Output is correct
75	Correct	26 ms	15052 KB	Output is correct
76	Correct	190 ms	39044 KB	Output is correct
77	Correct	221 ms	39588 KB	Output is correct
78	Correct	22 ms	15060 KB	Output is correct
79	Correct	339 ms	39168 KB	Output is correct
80	Correct	7 ms	12244 KB	Output is correct
81	Correct	63 ms	20692 KB	Output is correct
82	Correct	230 ms	37216 KB	Output is correct
83	Correct	370 ms	35024 KB	Output is correct
84	Correct	331 ms	35020 KB	Output is correct
85	Correct	284 ms	35080 KB	Output is correct
86	Correct	297 ms	37364 KB	Output is correct
87	Correct	307 ms	37304 KB	Output is correct

Submission #765455

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