Submission #823021

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
823021	2023-08-12T07:06:43 Z	serifefedartar	Network (BOI15_net)	C++17	100 / 100	371 ms	47664 KB

#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
#define f first
#define s second
#define MOD 1000000009
#define LOGN 20
#define MAXN 2000100
 
vector<vector<int>> graph;
vector<int> leaves;
void dfs(int node, int parent) {
    if (graph[node].size() == 1)
        leaves.push_back(node);

    for (auto u : graph[node]) {
        if (u == parent)
            continue;
        dfs(u, node);
    }
}

int main() {
    fast
    int n, u, v;
    cin >> n;

    graph = vector<vector<int>>(n+1, vector<int>());
    for (int i = 1; i < n; i++) {
        cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);
    }
    dfs(1, 1);

    cout << (leaves.size()+1) / 2 << "\n";
    for (int i = 0; i < (leaves.size()+1)/2; i++) {
        cout << leaves[i] << " " << leaves[i + leaves.size()/2] << "\n";       
    }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:39:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for (int i = 0; i < (leaves.size()+1)/2; i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	316 KB	Output is correct
6	Correct	0 ms	316 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	1 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	316 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	1 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	0 ms	320 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	316 KB	Output is correct
6	Correct	0 ms	316 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	1 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	316 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	1 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	0 ms	320 KB	Output is correct
21	Correct	0 ms	324 KB	Output is correct
22	Correct	1 ms	468 KB	Output is correct
23	Correct	1 ms	468 KB	Output is correct
24	Correct	1 ms	468 KB	Output is correct
25	Correct	1 ms	340 KB	Output is correct
26	Correct	1 ms	340 KB	Output is correct
27	Correct	1 ms	468 KB	Output is correct
28	Correct	1 ms	468 KB	Output is correct
29	Correct	1 ms	340 KB	Output is correct
30	Correct	1 ms	212 KB	Output is correct
31	Correct	1 ms	468 KB	Output is correct
32	Correct	0 ms	212 KB	Output is correct
33	Correct	0 ms	320 KB	Output is correct
34	Correct	0 ms	212 KB	Output is correct
35	Correct	1 ms	320 KB	Output is correct
36	Correct	0 ms	320 KB	Output is correct
37	Correct	1 ms	340 KB	Output is correct
38	Correct	1 ms	340 KB	Output is correct
39	Correct	0 ms	212 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct
41	Correct	0 ms	212 KB	Output is correct
42	Correct	1 ms	340 KB	Output is correct
43	Correct	1 ms	340 KB	Output is correct
44	Correct	0 ms	212 KB	Output is correct
45	Correct	1 ms	340 KB	Output is correct
46	Correct	1 ms	340 KB	Output is correct
47	Correct	0 ms	212 KB	Output is correct
48	Correct	1 ms	340 KB	Output is correct
49	Correct	1 ms	340 KB	Output is correct
50	Correct	0 ms	212 KB	Output is correct
51	Correct	1 ms	316 KB	Output is correct
52	Correct	0 ms	340 KB	Output is correct
53	Correct	1 ms	340 KB	Output is correct
54	Correct	0 ms	212 KB	Output is correct
55	Correct	0 ms	340 KB	Output is correct
56	Correct	0 ms	212 KB	Output is correct
57	Correct	1 ms	340 KB	Output is correct
58	Correct	1 ms	464 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	316 KB	Output is correct
6	Correct	0 ms	316 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	1 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	316 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	1 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	0 ms	320 KB	Output is correct
21	Correct	0 ms	324 KB	Output is correct
22	Correct	1 ms	468 KB	Output is correct
23	Correct	1 ms	468 KB	Output is correct
24	Correct	1 ms	468 KB	Output is correct
25	Correct	1 ms	340 KB	Output is correct
26	Correct	1 ms	340 KB	Output is correct
27	Correct	1 ms	468 KB	Output is correct
28	Correct	1 ms	468 KB	Output is correct
29	Correct	1 ms	340 KB	Output is correct
30	Correct	1 ms	212 KB	Output is correct
31	Correct	1 ms	468 KB	Output is correct
32	Correct	0 ms	212 KB	Output is correct
33	Correct	0 ms	320 KB	Output is correct
34	Correct	0 ms	212 KB	Output is correct
35	Correct	1 ms	320 KB	Output is correct
36	Correct	0 ms	320 KB	Output is correct
37	Correct	1 ms	340 KB	Output is correct
38	Correct	1 ms	340 KB	Output is correct
39	Correct	0 ms	212 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct
41	Correct	0 ms	212 KB	Output is correct
42	Correct	1 ms	340 KB	Output is correct
43	Correct	1 ms	340 KB	Output is correct
44	Correct	0 ms	212 KB	Output is correct
45	Correct	1 ms	340 KB	Output is correct
46	Correct	1 ms	340 KB	Output is correct
47	Correct	0 ms	212 KB	Output is correct
48	Correct	1 ms	340 KB	Output is correct
49	Correct	1 ms	340 KB	Output is correct
50	Correct	0 ms	212 KB	Output is correct
51	Correct	1 ms	316 KB	Output is correct
52	Correct	0 ms	340 KB	Output is correct
53	Correct	1 ms	340 KB	Output is correct
54	Correct	0 ms	212 KB	Output is correct
55	Correct	0 ms	340 KB	Output is correct
56	Correct	0 ms	212 KB	Output is correct
57	Correct	1 ms	340 KB	Output is correct
58	Correct	1 ms	464 KB	Output is correct
59	Correct	222 ms	34916 KB	Output is correct
60	Correct	285 ms	38708 KB	Output is correct
61	Correct	1 ms	212 KB	Output is correct
62	Correct	0 ms	312 KB	Output is correct
63	Correct	206 ms	31244 KB	Output is correct
64	Correct	2 ms	852 KB	Output is correct
65	Correct	7 ms	2676 KB	Output is correct
66	Correct	69 ms	20324 KB	Output is correct
67	Correct	357 ms	46980 KB	Output is correct
68	Correct	331 ms	47664 KB	Output is correct
69	Correct	4 ms	1492 KB	Output is correct
70	Correct	54 ms	13304 KB	Output is correct
71	Correct	190 ms	41788 KB	Output is correct
72	Correct	215 ms	40660 KB	Output is correct
73	Correct	50 ms	10572 KB	Output is correct
74	Correct	302 ms	37788 KB	Output is correct
75	Correct	15 ms	4768 KB	Output is correct
76	Correct	239 ms	41576 KB	Output is correct
77	Correct	191 ms	41572 KB	Output is correct
78	Correct	15 ms	4948 KB	Output is correct
79	Correct	324 ms	45140 KB	Output is correct
80	Correct	2 ms	596 KB	Output is correct
81	Correct	54 ms	13472 KB	Output is correct
82	Correct	244 ms	39488 KB	Output is correct
83	Correct	337 ms	37708 KB	Output is correct
84	Correct	313 ms	37728 KB	Output is correct
85	Correct	298 ms	37672 KB	Output is correct
86	Correct	371 ms	38660 KB	Output is correct
87	Correct	357 ms	38856 KB	Output is correct

Submission #823021

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