답안 #102146

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
102146	2019-03-22T20:14:55 Z	Leonardo_Paes	Network (BOI15_net)	C++11	100 / 100	1099 ms	47592 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(){

    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	12 ms	12032 KB	Output is correct
2	Correct	14 ms	12032 KB	Output is correct
3	Correct	14 ms	12032 KB	Output is correct
4	Correct	15 ms	12160 KB	Output is correct
5	Correct	12 ms	12160 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	13 ms	12160 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	11 ms	12032 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	13 ms	12032 KB	Output is correct
13	Correct	13 ms	12032 KB	Output is correct
14	Correct	13 ms	12160 KB	Output is correct
15	Correct	16 ms	12032 KB	Output is correct
16	Correct	14 ms	12032 KB	Output is correct
17	Correct	13 ms	12032 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	15 ms	12032 KB	Output is correct
20	Correct	16 ms	12160 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12032 KB	Output is correct
2	Correct	14 ms	12032 KB	Output is correct
3	Correct	14 ms	12032 KB	Output is correct
4	Correct	15 ms	12160 KB	Output is correct
5	Correct	12 ms	12160 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	13 ms	12160 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	11 ms	12032 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	13 ms	12032 KB	Output is correct
13	Correct	13 ms	12032 KB	Output is correct
14	Correct	13 ms	12160 KB	Output is correct
15	Correct	16 ms	12032 KB	Output is correct
16	Correct	14 ms	12032 KB	Output is correct
17	Correct	13 ms	12032 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	15 ms	12032 KB	Output is correct
20	Correct	16 ms	12160 KB	Output is correct
21	Correct	15 ms	12032 KB	Output is correct
22	Correct	18 ms	12160 KB	Output is correct
23	Correct	17 ms	12160 KB	Output is correct
24	Correct	15 ms	12160 KB	Output is correct
25	Correct	14 ms	12152 KB	Output is correct
26	Correct	19 ms	12160 KB	Output is correct
27	Correct	15 ms	12160 KB	Output is correct
28	Correct	18 ms	12160 KB	Output is correct
29	Correct	17 ms	12160 KB	Output is correct
30	Correct	15 ms	12032 KB	Output is correct
31	Correct	16 ms	12160 KB	Output is correct
32	Correct	15 ms	12160 KB	Output is correct
33	Correct	13 ms	12160 KB	Output is correct
34	Correct	15 ms	12160 KB	Output is correct
35	Correct	15 ms	12032 KB	Output is correct
36	Correct	14 ms	12032 KB	Output is correct
37	Correct	15 ms	12160 KB	Output is correct
38	Correct	18 ms	12152 KB	Output is correct
39	Correct	15 ms	12160 KB	Output is correct
40	Correct	15 ms	12160 KB	Output is correct
41	Correct	14 ms	12032 KB	Output is correct
42	Correct	14 ms	12032 KB	Output is correct
43	Correct	14 ms	12160 KB	Output is correct
44	Correct	16 ms	12032 KB	Output is correct
45	Correct	15 ms	12032 KB	Output is correct
46	Correct	17 ms	12160 KB	Output is correct
47	Correct	14 ms	12032 KB	Output is correct
48	Correct	15 ms	12032 KB	Output is correct
49	Correct	15 ms	12160 KB	Output is correct
50	Correct	14 ms	12032 KB	Output is correct
51	Correct	13 ms	12032 KB	Output is correct
52	Correct	18 ms	12032 KB	Output is correct
53	Correct	23 ms	12152 KB	Output is correct
54	Correct	14 ms	12032 KB	Output is correct
55	Correct	15 ms	12160 KB	Output is correct
56	Correct	13 ms	12032 KB	Output is correct
57	Correct	14 ms	12032 KB	Output is correct
58	Correct	18 ms	12160 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12032 KB	Output is correct
2	Correct	14 ms	12032 KB	Output is correct
3	Correct	14 ms	12032 KB	Output is correct
4	Correct	15 ms	12160 KB	Output is correct
5	Correct	12 ms	12160 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	13 ms	12160 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	11 ms	12032 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	13 ms	12032 KB	Output is correct
13	Correct	13 ms	12032 KB	Output is correct
14	Correct	13 ms	12160 KB	Output is correct
15	Correct	16 ms	12032 KB	Output is correct
16	Correct	14 ms	12032 KB	Output is correct
17	Correct	13 ms	12032 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	15 ms	12032 KB	Output is correct
20	Correct	16 ms	12160 KB	Output is correct
21	Correct	15 ms	12032 KB	Output is correct
22	Correct	18 ms	12160 KB	Output is correct
23	Correct	17 ms	12160 KB	Output is correct
24	Correct	15 ms	12160 KB	Output is correct
25	Correct	14 ms	12152 KB	Output is correct
26	Correct	19 ms	12160 KB	Output is correct
27	Correct	15 ms	12160 KB	Output is correct
28	Correct	18 ms	12160 KB	Output is correct
29	Correct	17 ms	12160 KB	Output is correct
30	Correct	15 ms	12032 KB	Output is correct
31	Correct	16 ms	12160 KB	Output is correct
32	Correct	15 ms	12160 KB	Output is correct
33	Correct	13 ms	12160 KB	Output is correct
34	Correct	15 ms	12160 KB	Output is correct
35	Correct	15 ms	12032 KB	Output is correct
36	Correct	14 ms	12032 KB	Output is correct
37	Correct	15 ms	12160 KB	Output is correct
38	Correct	18 ms	12152 KB	Output is correct
39	Correct	15 ms	12160 KB	Output is correct
40	Correct	15 ms	12160 KB	Output is correct
41	Correct	14 ms	12032 KB	Output is correct
42	Correct	14 ms	12032 KB	Output is correct
43	Correct	14 ms	12160 KB	Output is correct
44	Correct	16 ms	12032 KB	Output is correct
45	Correct	15 ms	12032 KB	Output is correct
46	Correct	17 ms	12160 KB	Output is correct
47	Correct	14 ms	12032 KB	Output is correct
48	Correct	15 ms	12032 KB	Output is correct
49	Correct	15 ms	12160 KB	Output is correct
50	Correct	14 ms	12032 KB	Output is correct
51	Correct	13 ms	12032 KB	Output is correct
52	Correct	18 ms	12032 KB	Output is correct
53	Correct	23 ms	12152 KB	Output is correct
54	Correct	14 ms	12032 KB	Output is correct
55	Correct	15 ms	12160 KB	Output is correct
56	Correct	13 ms	12032 KB	Output is correct
57	Correct	14 ms	12032 KB	Output is correct
58	Correct	18 ms	12160 KB	Output is correct
59	Correct	716 ms	36044 KB	Output is correct
60	Correct	910 ms	38788 KB	Output is correct
61	Correct	13 ms	12032 KB	Output is correct
62	Correct	13 ms	12032 KB	Output is correct
63	Correct	655 ms	33648 KB	Output is correct
64	Correct	17 ms	12544 KB	Output is correct
65	Correct	41 ms	13944 KB	Output is correct
66	Correct	285 ms	27868 KB	Output is correct
67	Correct	1099 ms	47096 KB	Output is correct
68	Correct	879 ms	47592 KB	Output is correct
69	Correct	40 ms	12944 KB	Output is correct
70	Correct	214 ms	21224 KB	Output is correct
71	Correct	580 ms	41704 KB	Output is correct
72	Correct	800 ms	40624 KB	Output is correct
73	Correct	196 ms	19064 KB	Output is correct
74	Correct	794 ms	37652 KB	Output is correct
75	Correct	68 ms	15352 KB	Output is correct
76	Correct	634 ms	41440 KB	Output is correct
77	Correct	645 ms	41548 KB	Output is correct
78	Correct	112 ms	15484 KB	Output is correct
79	Correct	879 ms	45304 KB	Output is correct
80	Correct	17 ms	12280 KB	Output is correct
81	Correct	232 ms	21332 KB	Output is correct
82	Correct	664 ms	39404 KB	Output is correct
83	Correct	755 ms	37712 KB	Output is correct
84	Correct	739 ms	37732 KB	Output is correct
85	Correct	801 ms	37700 KB	Output is correct
86	Correct	865 ms	38648 KB	Output is correct
87	Correct	855 ms	38796 KB	Output is correct

답안 #102146

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