답안 #102150

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
102150	2019-03-22T20:21:18 Z	Leonardo_Paes	Network (BOI15_net)	C++11	100 / 100	625 ms	41036 KB

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 5e5 + 100;

int v[MAXN], cnt;

vector<int> grafo[MAXN];

int read()
{
	int x=0,f=1;char c=getchar();
	while (c<'0'||c>'9') {if (c=='-') f=-1;c=getchar();}
	while (c>='0'&&c<='9') x=(x<<1)+(x<<3)+(c^48),c=getchar();
	return x*f;
}

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);cout.tie(NULL);
    int n=read();

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

        a=read();
        b=read();

        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] << "\n";
    }
    return 0;
}

Compilation message

net.cpp: In function 'void dfs(int, int)':
net.cpp:21:17: 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	12160 KB	Output is correct
2	Correct	13 ms	12032 KB	Output is correct
3	Correct	14 ms	12160 KB	Output is correct
4	Correct	14 ms	12032 KB	Output is correct
5	Correct	13 ms	12032 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	13 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	20 ms	12160 KB	Output is correct
10	Correct	14 ms	12032 KB	Output is correct
11	Correct	13 ms	12032 KB	Output is correct
12	Correct	14 ms	12160 KB	Output is correct
13	Correct	12 ms	12032 KB	Output is correct
14	Correct	13 ms	12032 KB	Output is correct
15	Correct	12 ms	12032 KB	Output is correct
16	Correct	12 ms	12032 KB	Output is correct
17	Correct	11 ms	12160 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	13 ms	12160 KB	Output is correct
20	Correct	15 ms	12160 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12160 KB	Output is correct
2	Correct	13 ms	12032 KB	Output is correct
3	Correct	14 ms	12160 KB	Output is correct
4	Correct	14 ms	12032 KB	Output is correct
5	Correct	13 ms	12032 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	13 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	20 ms	12160 KB	Output is correct
10	Correct	14 ms	12032 KB	Output is correct
11	Correct	13 ms	12032 KB	Output is correct
12	Correct	14 ms	12160 KB	Output is correct
13	Correct	12 ms	12032 KB	Output is correct
14	Correct	13 ms	12032 KB	Output is correct
15	Correct	12 ms	12032 KB	Output is correct
16	Correct	12 ms	12032 KB	Output is correct
17	Correct	11 ms	12160 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	13 ms	12160 KB	Output is correct
20	Correct	15 ms	12160 KB	Output is correct
21	Correct	12 ms	12160 KB	Output is correct
22	Correct	13 ms	12160 KB	Output is correct
23	Correct	15 ms	12200 KB	Output is correct
24	Correct	13 ms	12160 KB	Output is correct
25	Correct	13 ms	12160 KB	Output is correct
26	Correct	14 ms	12160 KB	Output is correct
27	Correct	14 ms	12192 KB	Output is correct
28	Correct	15 ms	12160 KB	Output is correct
29	Correct	16 ms	12168 KB	Output is correct
30	Correct	14 ms	12032 KB	Output is correct
31	Correct	15 ms	12140 KB	Output is correct
32	Correct	12 ms	12032 KB	Output is correct
33	Correct	12 ms	12032 KB	Output is correct
34	Correct	12 ms	12032 KB	Output is correct
35	Correct	13 ms	12160 KB	Output is correct
36	Correct	12 ms	12160 KB	Output is correct
37	Correct	14 ms	12160 KB	Output is correct
38	Correct	12 ms	12160 KB	Output is correct
39	Correct	13 ms	12160 KB	Output is correct
40	Correct	12 ms	12032 KB	Output is correct
41	Correct	12 ms	12132 KB	Output is correct
42	Correct	13 ms	12288 KB	Output is correct
43	Correct	13 ms	12160 KB	Output is correct
44	Correct	13 ms	12160 KB	Output is correct
45	Correct	13 ms	12160 KB	Output is correct
46	Correct	16 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	16 ms	12160 KB	Output is correct
51	Correct	13 ms	12160 KB	Output is correct
52	Correct	13 ms	12160 KB	Output is correct
53	Correct	13 ms	12160 KB	Output is correct
54	Correct	16 ms	12160 KB	Output is correct
55	Correct	13 ms	12160 KB	Output is correct
56	Correct	21 ms	12032 KB	Output is correct
57	Correct	13 ms	12160 KB	Output is correct
58	Correct	14 ms	12232 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12160 KB	Output is correct
2	Correct	13 ms	12032 KB	Output is correct
3	Correct	14 ms	12160 KB	Output is correct
4	Correct	14 ms	12032 KB	Output is correct
5	Correct	13 ms	12032 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	13 ms	12160 KB	Output is correct
8	Correct	13 ms	12160 KB	Output is correct
9	Correct	20 ms	12160 KB	Output is correct
10	Correct	14 ms	12032 KB	Output is correct
11	Correct	13 ms	12032 KB	Output is correct
12	Correct	14 ms	12160 KB	Output is correct
13	Correct	12 ms	12032 KB	Output is correct
14	Correct	13 ms	12032 KB	Output is correct
15	Correct	12 ms	12032 KB	Output is correct
16	Correct	12 ms	12032 KB	Output is correct
17	Correct	11 ms	12160 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	13 ms	12160 KB	Output is correct
20	Correct	15 ms	12160 KB	Output is correct
21	Correct	12 ms	12160 KB	Output is correct
22	Correct	13 ms	12160 KB	Output is correct
23	Correct	15 ms	12200 KB	Output is correct
24	Correct	13 ms	12160 KB	Output is correct
25	Correct	13 ms	12160 KB	Output is correct
26	Correct	14 ms	12160 KB	Output is correct
27	Correct	14 ms	12192 KB	Output is correct
28	Correct	15 ms	12160 KB	Output is correct
29	Correct	16 ms	12168 KB	Output is correct
30	Correct	14 ms	12032 KB	Output is correct
31	Correct	15 ms	12140 KB	Output is correct
32	Correct	12 ms	12032 KB	Output is correct
33	Correct	12 ms	12032 KB	Output is correct
34	Correct	12 ms	12032 KB	Output is correct
35	Correct	13 ms	12160 KB	Output is correct
36	Correct	12 ms	12160 KB	Output is correct
37	Correct	14 ms	12160 KB	Output is correct
38	Correct	12 ms	12160 KB	Output is correct
39	Correct	13 ms	12160 KB	Output is correct
40	Correct	12 ms	12032 KB	Output is correct
41	Correct	12 ms	12132 KB	Output is correct
42	Correct	13 ms	12288 KB	Output is correct
43	Correct	13 ms	12160 KB	Output is correct
44	Correct	13 ms	12160 KB	Output is correct
45	Correct	13 ms	12160 KB	Output is correct
46	Correct	16 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	16 ms	12160 KB	Output is correct
51	Correct	13 ms	12160 KB	Output is correct
52	Correct	13 ms	12160 KB	Output is correct
53	Correct	13 ms	12160 KB	Output is correct
54	Correct	16 ms	12160 KB	Output is correct
55	Correct	13 ms	12160 KB	Output is correct
56	Correct	21 ms	12032 KB	Output is correct
57	Correct	13 ms	12160 KB	Output is correct
58	Correct	14 ms	12232 KB	Output is correct
59	Correct	477 ms	29916 KB	Output is correct
60	Correct	517 ms	32048 KB	Output is correct
61	Correct	14 ms	12032 KB	Output is correct
62	Correct	14 ms	12032 KB	Output is correct
63	Correct	356 ms	28296 KB	Output is correct
64	Correct	14 ms	12416 KB	Output is correct
65	Correct	26 ms	13824 KB	Output is correct
66	Correct	191 ms	25720 KB	Output is correct
67	Correct	598 ms	40440 KB	Output is correct
68	Correct	578 ms	41036 KB	Output is correct
69	Correct	16 ms	12800 KB	Output is correct
70	Correct	97 ms	19052 KB	Output is correct
71	Correct	317 ms	35056 KB	Output is correct
72	Correct	367 ms	34276 KB	Output is correct
73	Correct	123 ms	17272 KB	Output is correct
74	Correct	503 ms	30968 KB	Output is correct
75	Correct	35 ms	14712 KB	Output is correct
76	Correct	332 ms	34656 KB	Output is correct
77	Correct	373 ms	35164 KB	Output is correct
78	Correct	42 ms	14968 KB	Output is correct
79	Correct	625 ms	38680 KB	Output is correct
80	Correct	15 ms	12288 KB	Output is correct
81	Correct	109 ms	19180 KB	Output is correct
82	Correct	410 ms	33096 KB	Output is correct
83	Correct	467 ms	30912 KB	Output is correct
84	Correct	499 ms	30968 KB	Output is correct
85	Correct	549 ms	30996 KB	Output is correct
86	Correct	514 ms	32256 KB	Output is correct
87	Correct	540 ms	32020 KB	Output is correct

답안 #102150

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