답안 #102147

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
102147	2019-03-22T20:16:12 Z	Leonardo_Paes	Network (BOI15_net)	C++11	100 / 100	718 ms	41064 KB

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 5e5 + 100;

int v[MAXN], cnt;

vector<int> grafo[MAXN];

void dfs(int u, int p)
{
	for (int i=0; i<grafo[u].size(); i++){
        int v = grafo[u][i];
		if (v == p) continue;
		dfs(v, u);
	}

	if (grafo[u].size() == 1) v[++cnt] = u;
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    int n;

    cin >> n;

    for(int i=1; i<n; i++){
        int a, b;

        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){
            dfs(i, 0);
            break;
        }
    }

    int ans = (cnt+1)/2;

    cout << ans << "\n";

    for(int i=1; i<ans; i++){
        cout << v[i] << " " << v[i+ans] << "\n";
    }
    if(cnt&1){
        cout << v[ans] << " " << v[1] << "\n";
    }
    else{
        cout << v[ans] << " " << v[cnt];
    }
    return 0;
}

Compilation message

net.cpp: In function 'void dfs(int, int)':
net.cpp:13:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<grafo[u].size(); i++){
                ~^~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12032 KB	Output is correct
2	Correct	12 ms	12160 KB	Output is correct
3	Correct	11 ms	12160 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	11 ms	12160 KB	Output is correct
6	Correct	12 ms	12160 KB	Output is correct
7	Correct	12 ms	12032 KB	Output is correct
8	Correct	14 ms	12160 KB	Output is correct
9	Correct	14 ms	12160 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	11 ms	12032 KB	Output is correct
12	Correct	12 ms	12160 KB	Output is correct
13	Correct	12 ms	12032 KB	Output is correct
14	Correct	15 ms	12120 KB	Output is correct
15	Correct	12 ms	12032 KB	Output is correct
16	Correct	14 ms	12032 KB	Output is correct
17	Correct	24 ms	12032 KB	Output is correct
18	Correct	12 ms	12160 KB	Output is correct
19	Correct	12 ms	12032 KB	Output is correct
20	Correct	13 ms	12160 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12032 KB	Output is correct
2	Correct	12 ms	12160 KB	Output is correct
3	Correct	11 ms	12160 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	11 ms	12160 KB	Output is correct
6	Correct	12 ms	12160 KB	Output is correct
7	Correct	12 ms	12032 KB	Output is correct
8	Correct	14 ms	12160 KB	Output is correct
9	Correct	14 ms	12160 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	11 ms	12032 KB	Output is correct
12	Correct	12 ms	12160 KB	Output is correct
13	Correct	12 ms	12032 KB	Output is correct
14	Correct	15 ms	12120 KB	Output is correct
15	Correct	12 ms	12032 KB	Output is correct
16	Correct	14 ms	12032 KB	Output is correct
17	Correct	24 ms	12032 KB	Output is correct
18	Correct	12 ms	12160 KB	Output is correct
19	Correct	12 ms	12032 KB	Output is correct
20	Correct	13 ms	12160 KB	Output is correct
21	Correct	15 ms	12160 KB	Output is correct
22	Correct	16 ms	12160 KB	Output is correct
23	Correct	15 ms	12160 KB	Output is correct
24	Correct	14 ms	12160 KB	Output is correct
25	Correct	17 ms	12032 KB	Output is correct
26	Correct	13 ms	12160 KB	Output is correct
27	Correct	14 ms	12160 KB	Output is correct
28	Correct	14 ms	12160 KB	Output is correct
29	Correct	16 ms	12160 KB	Output is correct
30	Correct	13 ms	12032 KB	Output is correct
31	Correct	17 ms	12160 KB	Output is correct
32	Correct	12 ms	12160 KB	Output is correct
33	Correct	13 ms	12032 KB	Output is correct
34	Correct	12 ms	12032 KB	Output is correct
35	Correct	15 ms	12160 KB	Output is correct
36	Correct	13 ms	12160 KB	Output is correct
37	Correct	13 ms	12160 KB	Output is correct
38	Correct	20 ms	12160 KB	Output is correct
39	Correct	13 ms	12108 KB	Output is correct
40	Correct	12 ms	12160 KB	Output is correct
41	Correct	13 ms	12160 KB	Output is correct
42	Correct	16 ms	12160 KB	Output is correct
43	Correct	14 ms	12160 KB	Output is correct
44	Correct	14 ms	12160 KB	Output is correct
45	Correct	14 ms	12160 KB	Output is correct
46	Correct	13 ms	12160 KB	Output is correct
47	Correct	13 ms	12160 KB	Output is correct
48	Correct	12 ms	12160 KB	Output is correct
49	Correct	12 ms	12160 KB	Output is correct
50	Correct	12 ms	12032 KB	Output is correct
51	Correct	11 ms	12160 KB	Output is correct
52	Correct	13 ms	12032 KB	Output is correct
53	Correct	13 ms	12160 KB	Output is correct
54	Correct	15 ms	12032 KB	Output is correct
55	Correct	15 ms	12160 KB	Output is correct
56	Correct	14 ms	12032 KB	Output is correct
57	Correct	14 ms	12160 KB	Output is correct
58	Correct	16 ms	12160 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12032 KB	Output is correct
2	Correct	12 ms	12160 KB	Output is correct
3	Correct	11 ms	12160 KB	Output is correct
4	Correct	11 ms	12160 KB	Output is correct
5	Correct	11 ms	12160 KB	Output is correct
6	Correct	12 ms	12160 KB	Output is correct
7	Correct	12 ms	12032 KB	Output is correct
8	Correct	14 ms	12160 KB	Output is correct
9	Correct	14 ms	12160 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	11 ms	12032 KB	Output is correct
12	Correct	12 ms	12160 KB	Output is correct
13	Correct	12 ms	12032 KB	Output is correct
14	Correct	15 ms	12120 KB	Output is correct
15	Correct	12 ms	12032 KB	Output is correct
16	Correct	14 ms	12032 KB	Output is correct
17	Correct	24 ms	12032 KB	Output is correct
18	Correct	12 ms	12160 KB	Output is correct
19	Correct	12 ms	12032 KB	Output is correct
20	Correct	13 ms	12160 KB	Output is correct
21	Correct	15 ms	12160 KB	Output is correct
22	Correct	16 ms	12160 KB	Output is correct
23	Correct	15 ms	12160 KB	Output is correct
24	Correct	14 ms	12160 KB	Output is correct
25	Correct	17 ms	12032 KB	Output is correct
26	Correct	13 ms	12160 KB	Output is correct
27	Correct	14 ms	12160 KB	Output is correct
28	Correct	14 ms	12160 KB	Output is correct
29	Correct	16 ms	12160 KB	Output is correct
30	Correct	13 ms	12032 KB	Output is correct
31	Correct	17 ms	12160 KB	Output is correct
32	Correct	12 ms	12160 KB	Output is correct
33	Correct	13 ms	12032 KB	Output is correct
34	Correct	12 ms	12032 KB	Output is correct
35	Correct	15 ms	12160 KB	Output is correct
36	Correct	13 ms	12160 KB	Output is correct
37	Correct	13 ms	12160 KB	Output is correct
38	Correct	20 ms	12160 KB	Output is correct
39	Correct	13 ms	12108 KB	Output is correct
40	Correct	12 ms	12160 KB	Output is correct
41	Correct	13 ms	12160 KB	Output is correct
42	Correct	16 ms	12160 KB	Output is correct
43	Correct	14 ms	12160 KB	Output is correct
44	Correct	14 ms	12160 KB	Output is correct
45	Correct	14 ms	12160 KB	Output is correct
46	Correct	13 ms	12160 KB	Output is correct
47	Correct	13 ms	12160 KB	Output is correct
48	Correct	12 ms	12160 KB	Output is correct
49	Correct	12 ms	12160 KB	Output is correct
50	Correct	12 ms	12032 KB	Output is correct
51	Correct	11 ms	12160 KB	Output is correct
52	Correct	13 ms	12032 KB	Output is correct
53	Correct	13 ms	12160 KB	Output is correct
54	Correct	15 ms	12032 KB	Output is correct
55	Correct	15 ms	12160 KB	Output is correct
56	Correct	14 ms	12032 KB	Output is correct
57	Correct	14 ms	12160 KB	Output is correct
58	Correct	16 ms	12160 KB	Output is correct
59	Correct	466 ms	30160 KB	Output is correct
60	Correct	569 ms	31992 KB	Output is correct
61	Correct	13 ms	12160 KB	Output is correct
62	Correct	14 ms	12160 KB	Output is correct
63	Correct	418 ms	28384 KB	Output is correct
64	Correct	15 ms	12544 KB	Output is correct
65	Correct	27 ms	13696 KB	Output is correct
66	Correct	244 ms	25848 KB	Output is correct
67	Correct	690 ms	40440 KB	Output is correct
68	Correct	718 ms	41064 KB	Output is correct
69	Correct	18 ms	12672 KB	Output is correct
70	Correct	102 ms	19052 KB	Output is correct
71	Correct	421 ms	35044 KB	Output is correct
72	Correct	393 ms	34404 KB	Output is correct
73	Correct	115 ms	17272 KB	Output is correct
74	Correct	642 ms	31184 KB	Output is correct
75	Correct	62 ms	14584 KB	Output is correct
76	Correct	437 ms	34724 KB	Output is correct
77	Correct	378 ms	35004 KB	Output is correct
78	Correct	50 ms	14840 KB	Output is correct
79	Correct	661 ms	38648 KB	Output is correct
80	Correct	15 ms	12288 KB	Output is correct
81	Correct	185 ms	19184 KB	Output is correct
82	Correct	450 ms	33132 KB	Output is correct
83	Correct	573 ms	30968 KB	Output is correct
84	Correct	567 ms	31096 KB	Output is correct
85	Correct	571 ms	30956 KB	Output is correct
86	Correct	547 ms	32052 KB	Output is correct
87	Correct	583 ms	32120 KB	Output is correct

답안 #102147

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