Submission #755839

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
755839	2023-06-10T16:41:17 Z	JellyTheOctopus	Network (BOI15_net)	C++17	100 / 100	672 ms	51940 KB

// Baltic Olympiad in Informatics 2015 Day 1 Problem 3
// Network
// https://oj.uz/problem/view/BOI15_net

#include <bits/stdc++.h>
using namespace std;

int N;
vector<int> adjList[500001];
vector<int> leaf;

void DFS(int node, int parent) {
	int numOfVertices = 0;
	for (auto child: adjList[node]) {
		numOfVertices++;
		if (child != parent) {
			DFS(child, node);
		}
	}
	if (numOfVertices == 1) {
		leaf.push_back(node);
	}
}

int main() {
	cin >> N;
	for (int i = 1; i < N; i++) {
		int u, v;
		cin >> u >> v;
		adjList[u].push_back(v);
		adjList[v].push_back(u);
	}
	DFS(1, -1);
	int k = (int)leaf.size();
	if (k % 2 == 0) {
		cout << k/2 << "\n";
		for (int i = 0; i < k/2; i++) {
			cout << leaf[i] << " " << leaf[i+k/2] << "\n";
		}
	}
	else {
		cout << k/2+1 << "\n";
		for (int i = 0; i < k/2; i++) {
			cout << leaf[i] << " " << leaf[i+k/2+1] << "\n";
		}
		cout << leaf[k/2] << " " << 1 << "\n";
	}
}

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	7 ms	11988 KB	Output is correct
3	Correct	6 ms	12000 KB	Output is correct
4	Correct	6 ms	11936 KB	Output is correct
5	Correct	7 ms	12040 KB	Output is correct
6	Correct	7 ms	12032 KB	Output is correct
7	Correct	7 ms	11988 KB	Output is correct
8	Correct	7 ms	11988 KB	Output is correct
9	Correct	7 ms	11988 KB	Output is correct
10	Correct	6 ms	11988 KB	Output is correct
11	Correct	7 ms	11988 KB	Output is correct
12	Correct	7 ms	11960 KB	Output is correct
13	Correct	7 ms	11940 KB	Output is correct
14	Correct	6 ms	12024 KB	Output is correct
15	Correct	8 ms	11972 KB	Output is correct
16	Correct	7 ms	11988 KB	Output is correct
17	Correct	6 ms	11988 KB	Output is correct
18	Correct	7 ms	12040 KB	Output is correct
19	Correct	6 ms	12040 KB	Output is correct
20	Correct	6 ms	12044 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	7 ms	11988 KB	Output is correct
3	Correct	6 ms	12000 KB	Output is correct
4	Correct	6 ms	11936 KB	Output is correct
5	Correct	7 ms	12040 KB	Output is correct
6	Correct	7 ms	12032 KB	Output is correct
7	Correct	7 ms	11988 KB	Output is correct
8	Correct	7 ms	11988 KB	Output is correct
9	Correct	7 ms	11988 KB	Output is correct
10	Correct	6 ms	11988 KB	Output is correct
11	Correct	7 ms	11988 KB	Output is correct
12	Correct	7 ms	11960 KB	Output is correct
13	Correct	7 ms	11940 KB	Output is correct
14	Correct	6 ms	12024 KB	Output is correct
15	Correct	8 ms	11972 KB	Output is correct
16	Correct	7 ms	11988 KB	Output is correct
17	Correct	6 ms	11988 KB	Output is correct
18	Correct	7 ms	12040 KB	Output is correct
19	Correct	6 ms	12040 KB	Output is correct
20	Correct	6 ms	12044 KB	Output is correct
21	Correct	7 ms	11988 KB	Output is correct
22	Correct	8 ms	12116 KB	Output is correct
23	Correct	8 ms	12100 KB	Output is correct
24	Correct	9 ms	12116 KB	Output is correct
25	Correct	8 ms	12100 KB	Output is correct
26	Correct	7 ms	12024 KB	Output is correct
27	Correct	8 ms	12108 KB	Output is correct
28	Correct	11 ms	12136 KB	Output is correct
29	Correct	8 ms	12040 KB	Output is correct
30	Correct	7 ms	12040 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	7 ms	11988 KB	Output is correct
33	Correct	9 ms	11988 KB	Output is correct
34	Correct	7 ms	12044 KB	Output is correct
35	Correct	7 ms	12044 KB	Output is correct
36	Correct	7 ms	12032 KB	Output is correct
37	Correct	7 ms	12044 KB	Output is correct
38	Correct	8 ms	12116 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	8 ms	12052 KB	Output is correct
41	Correct	7 ms	11988 KB	Output is correct
42	Correct	7 ms	11988 KB	Output is correct
43	Correct	7 ms	11988 KB	Output is correct
44	Correct	7 ms	12040 KB	Output is correct
45	Correct	8 ms	11988 KB	Output is correct
46	Correct	7 ms	12044 KB	Output is correct
47	Correct	7 ms	12040 KB	Output is correct
48	Correct	7 ms	11988 KB	Output is correct
49	Correct	7 ms	12052 KB	Output is correct
50	Correct	7 ms	11988 KB	Output is correct
51	Correct	7 ms	11992 KB	Output is correct
52	Correct	7 ms	11988 KB	Output is correct
53	Correct	7 ms	11988 KB	Output is correct
54	Correct	7 ms	12040 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	7 ms	11948 KB	Output is correct
57	Correct	8 ms	12052 KB	Output is correct
58	Correct	10 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	7 ms	11988 KB	Output is correct
3	Correct	6 ms	12000 KB	Output is correct
4	Correct	6 ms	11936 KB	Output is correct
5	Correct	7 ms	12040 KB	Output is correct
6	Correct	7 ms	12032 KB	Output is correct
7	Correct	7 ms	11988 KB	Output is correct
8	Correct	7 ms	11988 KB	Output is correct
9	Correct	7 ms	11988 KB	Output is correct
10	Correct	6 ms	11988 KB	Output is correct
11	Correct	7 ms	11988 KB	Output is correct
12	Correct	7 ms	11960 KB	Output is correct
13	Correct	7 ms	11940 KB	Output is correct
14	Correct	6 ms	12024 KB	Output is correct
15	Correct	8 ms	11972 KB	Output is correct
16	Correct	7 ms	11988 KB	Output is correct
17	Correct	6 ms	11988 KB	Output is correct
18	Correct	7 ms	12040 KB	Output is correct
19	Correct	6 ms	12040 KB	Output is correct
20	Correct	6 ms	12044 KB	Output is correct
21	Correct	7 ms	11988 KB	Output is correct
22	Correct	8 ms	12116 KB	Output is correct
23	Correct	8 ms	12100 KB	Output is correct
24	Correct	9 ms	12116 KB	Output is correct
25	Correct	8 ms	12100 KB	Output is correct
26	Correct	7 ms	12024 KB	Output is correct
27	Correct	8 ms	12108 KB	Output is correct
28	Correct	11 ms	12136 KB	Output is correct
29	Correct	8 ms	12040 KB	Output is correct
30	Correct	7 ms	12040 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	7 ms	11988 KB	Output is correct
33	Correct	9 ms	11988 KB	Output is correct
34	Correct	7 ms	12044 KB	Output is correct
35	Correct	7 ms	12044 KB	Output is correct
36	Correct	7 ms	12032 KB	Output is correct
37	Correct	7 ms	12044 KB	Output is correct
38	Correct	8 ms	12116 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	8 ms	12052 KB	Output is correct
41	Correct	7 ms	11988 KB	Output is correct
42	Correct	7 ms	11988 KB	Output is correct
43	Correct	7 ms	11988 KB	Output is correct
44	Correct	7 ms	12040 KB	Output is correct
45	Correct	8 ms	11988 KB	Output is correct
46	Correct	7 ms	12044 KB	Output is correct
47	Correct	7 ms	12040 KB	Output is correct
48	Correct	7 ms	11988 KB	Output is correct
49	Correct	7 ms	12052 KB	Output is correct
50	Correct	7 ms	11988 KB	Output is correct
51	Correct	7 ms	11992 KB	Output is correct
52	Correct	7 ms	11988 KB	Output is correct
53	Correct	7 ms	11988 KB	Output is correct
54	Correct	7 ms	12040 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	7 ms	11948 KB	Output is correct
57	Correct	8 ms	12052 KB	Output is correct
58	Correct	10 ms	12116 KB	Output is correct
59	Correct	509 ms	36024 KB	Output is correct
60	Correct	581 ms	38708 KB	Output is correct
61	Correct	7 ms	11988 KB	Output is correct
62	Correct	7 ms	12044 KB	Output is correct
63	Correct	427 ms	33576 KB	Output is correct
64	Correct	13 ms	12500 KB	Output is correct
65	Correct	27 ms	14112 KB	Output is correct
66	Correct	182 ms	30472 KB	Output is correct
67	Correct	672 ms	51096 KB	Output is correct
68	Correct	604 ms	51940 KB	Output is correct
69	Correct	17 ms	12884 KB	Output is correct
70	Correct	140 ms	21148 KB	Output is correct
71	Correct	482 ms	42024 KB	Output is correct
72	Correct	443 ms	40620 KB	Output is correct
73	Correct	120 ms	19016 KB	Output is correct
74	Correct	582 ms	37600 KB	Output is correct
75	Correct	56 ms	15144 KB	Output is correct
76	Correct	457 ms	41448 KB	Output is correct
77	Correct	475 ms	41616 KB	Output is correct
78	Correct	53 ms	15500 KB	Output is correct
79	Correct	601 ms	48812 KB	Output is correct
80	Correct	9 ms	12184 KB	Output is correct
81	Correct	188 ms	21292 KB	Output is correct
82	Correct	502 ms	39500 KB	Output is correct
83	Correct	630 ms	37772 KB	Output is correct
84	Correct	541 ms	37672 KB	Output is correct
85	Correct	587 ms	37680 KB	Output is correct
86	Correct	597 ms	38744 KB	Output is correct
87	Correct	570 ms	38748 KB	Output is correct

Submission #755839

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