답안 #67259 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
67259	2018-08-13T17:55:06 Z	MatheusLealV	Network (BOI15_net)	C++17	100 / 100	1026 ms	155240 KB

#include <bits/stdc++.h>
#define N 500050
#define f first
#define s second
using namespace std;
typedef pair<int, int> pii;
 
int n, ponte, cnt, id[N], menor[N], root;
 
vector<int> grafo[N], leaf;
 
void dfs(int x, int p)
{
	menor[x] = x;

	for(auto v: grafo[x])
	{
		if(v == p) continue;

		dfs(v, x);

		menor[x] = min(menor[x], menor[v]);
	}
}
 
void dfs2(int x, int p)
{
	vector<pii> order;

	if(grafo[x].size() == 1) leaf.push_back(x);

	for(auto v: grafo[x])
	{
		if(v == p) continue;

		order.push_back({menor[v], v});
	}

	sort(order.begin(), order.end());

	for(auto v: order) dfs2(v.s, x);
}

int main()
{
	ios::sync_with_stdio(false); cin.tie(0);
  
	cin>>n;
 
	for(int i = 1, a, b; i < n; i++)
	{
		cin>>a>>b;
 
		grafo[a].push_back(b);
 
		grafo[b].push_back(a);
	}
 
 	for(int i = 1; i <= n; i++)
 	{
 		if(grafo[i].size() <= 1) continue;

 		root = i;

 		break;
 	}

 	dfs(root, root);

 	dfs2(root, root);

 	cout<<(ceil(leaf.size()/2.0))<<"\n";

 	for(int i = 0, j = ((leaf.size()/2)); i < (ceil(leaf.size()/2.0)); i++, j++)
 	{
 		cout<<leaf[i]<<" "<<leaf[j]<<"\n";
 	}
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	13 ms	12136 KB	Output is correct
3	Correct	15 ms	12136 KB	Output is correct
4	Correct	13 ms	12192 KB	Output is correct
5	Correct	16 ms	12284 KB	Output is correct
6	Correct	13 ms	12284 KB	Output is correct
7	Correct	13 ms	12528 KB	Output is correct
8	Correct	13 ms	12528 KB	Output is correct
9	Correct	13 ms	12528 KB	Output is correct
10	Correct	14 ms	12528 KB	Output is correct
11	Correct	16 ms	12528 KB	Output is correct
12	Correct	13 ms	12528 KB	Output is correct
13	Correct	14 ms	12528 KB	Output is correct
14	Correct	15 ms	12528 KB	Output is correct
15	Correct	15 ms	12528 KB	Output is correct
16	Correct	14 ms	12528 KB	Output is correct
17	Correct	15 ms	12528 KB	Output is correct
18	Correct	15 ms	12528 KB	Output is correct
19	Correct	15 ms	12528 KB	Output is correct
20	Correct	16 ms	12616 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	13 ms	12136 KB	Output is correct
3	Correct	15 ms	12136 KB	Output is correct
4	Correct	13 ms	12192 KB	Output is correct
5	Correct	16 ms	12284 KB	Output is correct
6	Correct	13 ms	12284 KB	Output is correct
7	Correct	13 ms	12528 KB	Output is correct
8	Correct	13 ms	12528 KB	Output is correct
9	Correct	13 ms	12528 KB	Output is correct
10	Correct	14 ms	12528 KB	Output is correct
11	Correct	16 ms	12528 KB	Output is correct
12	Correct	13 ms	12528 KB	Output is correct
13	Correct	14 ms	12528 KB	Output is correct
14	Correct	15 ms	12528 KB	Output is correct
15	Correct	15 ms	12528 KB	Output is correct
16	Correct	14 ms	12528 KB	Output is correct
17	Correct	15 ms	12528 KB	Output is correct
18	Correct	15 ms	12528 KB	Output is correct
19	Correct	15 ms	12528 KB	Output is correct
20	Correct	16 ms	12616 KB	Output is correct
21	Correct	16 ms	12616 KB	Output is correct
22	Correct	15 ms	12740 KB	Output is correct
23	Correct	16 ms	12776 KB	Output is correct
24	Correct	16 ms	12812 KB	Output is correct
25	Correct	17 ms	12812 KB	Output is correct
26	Correct	14 ms	12812 KB	Output is correct
27	Correct	17 ms	12820 KB	Output is correct
28	Correct	16 ms	12820 KB	Output is correct
29	Correct	14 ms	12820 KB	Output is correct
30	Correct	13 ms	12820 KB	Output is correct
31	Correct	16 ms	12840 KB	Output is correct
32	Correct	13 ms	12840 KB	Output is correct
33	Correct	14 ms	12848 KB	Output is correct
34	Correct	15 ms	12848 KB	Output is correct
35	Correct	14 ms	12848 KB	Output is correct
36	Correct	17 ms	12848 KB	Output is correct
37	Correct	13 ms	12864 KB	Output is correct
38	Correct	14 ms	12872 KB	Output is correct
39	Correct	14 ms	12872 KB	Output is correct
40	Correct	13 ms	12872 KB	Output is correct
41	Correct	15 ms	12872 KB	Output is correct
42	Correct	14 ms	12892 KB	Output is correct
43	Correct	15 ms	12896 KB	Output is correct
44	Correct	15 ms	12896 KB	Output is correct
45	Correct	15 ms	12908 KB	Output is correct
46	Correct	16 ms	12912 KB	Output is correct
47	Correct	16 ms	12912 KB	Output is correct
48	Correct	15 ms	12924 KB	Output is correct
49	Correct	14 ms	12932 KB	Output is correct
50	Correct	16 ms	12944 KB	Output is correct
51	Correct	15 ms	12944 KB	Output is correct
52	Correct	15 ms	12952 KB	Output is correct
53	Correct	15 ms	12956 KB	Output is correct
54	Correct	14 ms	12956 KB	Output is correct
55	Correct	14 ms	12968 KB	Output is correct
56	Correct	17 ms	12968 KB	Output is correct
57	Correct	14 ms	12976 KB	Output is correct
58	Correct	17 ms	12980 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	13 ms	12136 KB	Output is correct
3	Correct	15 ms	12136 KB	Output is correct
4	Correct	13 ms	12192 KB	Output is correct
5	Correct	16 ms	12284 KB	Output is correct
6	Correct	13 ms	12284 KB	Output is correct
7	Correct	13 ms	12528 KB	Output is correct
8	Correct	13 ms	12528 KB	Output is correct
9	Correct	13 ms	12528 KB	Output is correct
10	Correct	14 ms	12528 KB	Output is correct
11	Correct	16 ms	12528 KB	Output is correct
12	Correct	13 ms	12528 KB	Output is correct
13	Correct	14 ms	12528 KB	Output is correct
14	Correct	15 ms	12528 KB	Output is correct
15	Correct	15 ms	12528 KB	Output is correct
16	Correct	14 ms	12528 KB	Output is correct
17	Correct	15 ms	12528 KB	Output is correct
18	Correct	15 ms	12528 KB	Output is correct
19	Correct	15 ms	12528 KB	Output is correct
20	Correct	16 ms	12616 KB	Output is correct
21	Correct	16 ms	12616 KB	Output is correct
22	Correct	15 ms	12740 KB	Output is correct
23	Correct	16 ms	12776 KB	Output is correct
24	Correct	16 ms	12812 KB	Output is correct
25	Correct	17 ms	12812 KB	Output is correct
26	Correct	14 ms	12812 KB	Output is correct
27	Correct	17 ms	12820 KB	Output is correct
28	Correct	16 ms	12820 KB	Output is correct
29	Correct	14 ms	12820 KB	Output is correct
30	Correct	13 ms	12820 KB	Output is correct
31	Correct	16 ms	12840 KB	Output is correct
32	Correct	13 ms	12840 KB	Output is correct
33	Correct	14 ms	12848 KB	Output is correct
34	Correct	15 ms	12848 KB	Output is correct
35	Correct	14 ms	12848 KB	Output is correct
36	Correct	17 ms	12848 KB	Output is correct
37	Correct	13 ms	12864 KB	Output is correct
38	Correct	14 ms	12872 KB	Output is correct
39	Correct	14 ms	12872 KB	Output is correct
40	Correct	13 ms	12872 KB	Output is correct
41	Correct	15 ms	12872 KB	Output is correct
42	Correct	14 ms	12892 KB	Output is correct
43	Correct	15 ms	12896 KB	Output is correct
44	Correct	15 ms	12896 KB	Output is correct
45	Correct	15 ms	12908 KB	Output is correct
46	Correct	16 ms	12912 KB	Output is correct
47	Correct	16 ms	12912 KB	Output is correct
48	Correct	15 ms	12924 KB	Output is correct
49	Correct	14 ms	12932 KB	Output is correct
50	Correct	16 ms	12944 KB	Output is correct
51	Correct	15 ms	12944 KB	Output is correct
52	Correct	15 ms	12952 KB	Output is correct
53	Correct	15 ms	12956 KB	Output is correct
54	Correct	14 ms	12956 KB	Output is correct
55	Correct	14 ms	12968 KB	Output is correct
56	Correct	17 ms	12968 KB	Output is correct
57	Correct	14 ms	12976 KB	Output is correct
58	Correct	17 ms	12980 KB	Output is correct
59	Correct	713 ms	39700 KB	Output is correct
60	Correct	824 ms	47760 KB	Output is correct
61	Correct	13 ms	47760 KB	Output is correct
62	Correct	13 ms	47760 KB	Output is correct
63	Correct	605 ms	48804 KB	Output is correct
64	Correct	20 ms	48804 KB	Output is correct
65	Correct	36 ms	48804 KB	Output is correct
66	Correct	326 ms	63644 KB	Output is correct
67	Correct	981 ms	95540 KB	Output is correct
68	Correct	978 ms	102972 KB	Output is correct
69	Correct	22 ms	102972 KB	Output is correct
70	Correct	151 ms	102972 KB	Output is correct
71	Correct	590 ms	102972 KB	Output is correct
72	Correct	546 ms	102972 KB	Output is correct
73	Correct	199 ms	102972 KB	Output is correct
74	Correct	864 ms	102972 KB	Output is correct
75	Correct	60 ms	102972 KB	Output is correct
76	Correct	679 ms	104284 KB	Output is correct
77	Correct	562 ms	111108 KB	Output is correct
78	Correct	66 ms	111108 KB	Output is correct
79	Correct	1026 ms	141684 KB	Output is correct
80	Correct	16 ms	141684 KB	Output is correct
81	Correct	190 ms	141684 KB	Output is correct
82	Correct	725 ms	141684 KB	Output is correct
83	Correct	875 ms	141684 KB	Output is correct
84	Correct	800 ms	141684 KB	Output is correct
85	Correct	820 ms	141684 KB	Output is correct
86	Correct	815 ms	148708 KB	Output is correct
87	Correct	713 ms	155240 KB	Output is correct

답안 #67259

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