답안 #91096 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
91096	2018-12-26T08:59:35 Z	mirbek01	Network (BOI15_net)	C++11	100 / 100	784 ms	47764 KB

# include <bits/stdc++.h>

using namespace std;

const int N = 5e5 + 2;

int n;
vector <int> g[N], l;

void dfs(int v, int pr = 0){
      if(g[v].size() == 1)
            l.push_back(v);
      for(int to : g[v]){
            if(to == pr)
                  continue;
            dfs(to, v);
      }
}

int main(){
      scanf("%d", &n);

      for(int i = 1; i < n; i ++){
            int u, v;
            scanf("%d %d", &u, &v);
            g[u].push_back(v);
            g[v].push_back(u);
      }

      dfs(1);

      int m = (int)l.size();

      if(m & 1){
            cout << m / 2 + 1 << endl;
            l.push_back(1);
            for(int i = 0; i <= m / 2; i ++)
                  cout << l[i] << " " << l[i + m / 2 + 1] << endl;
      } else {
            cout << m / 2 << endl;
            for(int i = 0; i < m / 2; i ++)
                  cout << l[i] << " " << l[i + m / 2] << endl;
      }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:21:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &n);
       ~~~~~^~~~~~~~~~
net.cpp:25:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &u, &v);
             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12024 KB	Output is correct
2	Correct	12 ms	12032 KB	Output is correct
3	Correct	11 ms	12208 KB	Output is correct
4	Correct	11 ms	12208 KB	Output is correct
5	Correct	11 ms	12208 KB	Output is correct
6	Correct	11 ms	12208 KB	Output is correct
7	Correct	12 ms	12316 KB	Output is correct
8	Correct	11 ms	12364 KB	Output is correct
9	Correct	12 ms	12364 KB	Output is correct
10	Correct	11 ms	12364 KB	Output is correct
11	Correct	12 ms	12364 KB	Output is correct
12	Correct	12 ms	12364 KB	Output is correct
13	Correct	12 ms	12364 KB	Output is correct
14	Correct	12 ms	12364 KB	Output is correct
15	Correct	12 ms	12364 KB	Output is correct
16	Correct	12 ms	12364 KB	Output is correct
17	Correct	12 ms	12364 KB	Output is correct
18	Correct	12 ms	12364 KB	Output is correct
19	Correct	12 ms	12364 KB	Output is correct
20	Correct	12 ms	12364 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12024 KB	Output is correct
2	Correct	12 ms	12032 KB	Output is correct
3	Correct	11 ms	12208 KB	Output is correct
4	Correct	11 ms	12208 KB	Output is correct
5	Correct	11 ms	12208 KB	Output is correct
6	Correct	11 ms	12208 KB	Output is correct
7	Correct	12 ms	12316 KB	Output is correct
8	Correct	11 ms	12364 KB	Output is correct
9	Correct	12 ms	12364 KB	Output is correct
10	Correct	11 ms	12364 KB	Output is correct
11	Correct	12 ms	12364 KB	Output is correct
12	Correct	12 ms	12364 KB	Output is correct
13	Correct	12 ms	12364 KB	Output is correct
14	Correct	12 ms	12364 KB	Output is correct
15	Correct	12 ms	12364 KB	Output is correct
16	Correct	12 ms	12364 KB	Output is correct
17	Correct	12 ms	12364 KB	Output is correct
18	Correct	12 ms	12364 KB	Output is correct
19	Correct	12 ms	12364 KB	Output is correct
20	Correct	12 ms	12364 KB	Output is correct
21	Correct	12 ms	12364 KB	Output is correct
22	Correct	15 ms	12480 KB	Output is correct
23	Correct	14 ms	12500 KB	Output is correct
24	Correct	14 ms	12536 KB	Output is correct
25	Correct	14 ms	12572 KB	Output is correct
26	Correct	13 ms	12672 KB	Output is correct
27	Correct	14 ms	12672 KB	Output is correct
28	Correct	14 ms	12692 KB	Output is correct
29	Correct	13 ms	12692 KB	Output is correct
30	Correct	12 ms	12692 KB	Output is correct
31	Correct	14 ms	12708 KB	Output is correct
32	Correct	12 ms	12708 KB	Output is correct
33	Correct	12 ms	12708 KB	Output is correct
34	Correct	12 ms	12708 KB	Output is correct
35	Correct	12 ms	12708 KB	Output is correct
36	Correct	13 ms	12708 KB	Output is correct
37	Correct	12 ms	12708 KB	Output is correct
38	Correct	11 ms	12756 KB	Output is correct
39	Correct	10 ms	12756 KB	Output is correct
40	Correct	11 ms	12756 KB	Output is correct
41	Correct	12 ms	12756 KB	Output is correct
42	Correct	10 ms	12756 KB	Output is correct
43	Correct	12 ms	12756 KB	Output is correct
44	Correct	10 ms	12756 KB	Output is correct
45	Correct	9 ms	12756 KB	Output is correct
46	Correct	10 ms	12796 KB	Output is correct
47	Correct	11 ms	12796 KB	Output is correct
48	Correct	12 ms	12796 KB	Output is correct
49	Correct	13 ms	12812 KB	Output is correct
50	Correct	12 ms	12812 KB	Output is correct
51	Correct	11 ms	12828 KB	Output is correct
52	Correct	10 ms	12828 KB	Output is correct
53	Correct	12 ms	12836 KB	Output is correct
54	Correct	12 ms	12844 KB	Output is correct
55	Correct	10 ms	12844 KB	Output is correct
56	Correct	10 ms	12844 KB	Output is correct
57	Correct	13 ms	12844 KB	Output is correct
58	Correct	12 ms	12860 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12024 KB	Output is correct
2	Correct	12 ms	12032 KB	Output is correct
3	Correct	11 ms	12208 KB	Output is correct
4	Correct	11 ms	12208 KB	Output is correct
5	Correct	11 ms	12208 KB	Output is correct
6	Correct	11 ms	12208 KB	Output is correct
7	Correct	12 ms	12316 KB	Output is correct
8	Correct	11 ms	12364 KB	Output is correct
9	Correct	12 ms	12364 KB	Output is correct
10	Correct	11 ms	12364 KB	Output is correct
11	Correct	12 ms	12364 KB	Output is correct
12	Correct	12 ms	12364 KB	Output is correct
13	Correct	12 ms	12364 KB	Output is correct
14	Correct	12 ms	12364 KB	Output is correct
15	Correct	12 ms	12364 KB	Output is correct
16	Correct	12 ms	12364 KB	Output is correct
17	Correct	12 ms	12364 KB	Output is correct
18	Correct	12 ms	12364 KB	Output is correct
19	Correct	12 ms	12364 KB	Output is correct
20	Correct	12 ms	12364 KB	Output is correct
21	Correct	12 ms	12364 KB	Output is correct
22	Correct	15 ms	12480 KB	Output is correct
23	Correct	14 ms	12500 KB	Output is correct
24	Correct	14 ms	12536 KB	Output is correct
25	Correct	14 ms	12572 KB	Output is correct
26	Correct	13 ms	12672 KB	Output is correct
27	Correct	14 ms	12672 KB	Output is correct
28	Correct	14 ms	12692 KB	Output is correct
29	Correct	13 ms	12692 KB	Output is correct
30	Correct	12 ms	12692 KB	Output is correct
31	Correct	14 ms	12708 KB	Output is correct
32	Correct	12 ms	12708 KB	Output is correct
33	Correct	12 ms	12708 KB	Output is correct
34	Correct	12 ms	12708 KB	Output is correct
35	Correct	12 ms	12708 KB	Output is correct
36	Correct	13 ms	12708 KB	Output is correct
37	Correct	12 ms	12708 KB	Output is correct
38	Correct	11 ms	12756 KB	Output is correct
39	Correct	10 ms	12756 KB	Output is correct
40	Correct	11 ms	12756 KB	Output is correct
41	Correct	12 ms	12756 KB	Output is correct
42	Correct	10 ms	12756 KB	Output is correct
43	Correct	12 ms	12756 KB	Output is correct
44	Correct	10 ms	12756 KB	Output is correct
45	Correct	9 ms	12756 KB	Output is correct
46	Correct	10 ms	12796 KB	Output is correct
47	Correct	11 ms	12796 KB	Output is correct
48	Correct	12 ms	12796 KB	Output is correct
49	Correct	13 ms	12812 KB	Output is correct
50	Correct	12 ms	12812 KB	Output is correct
51	Correct	11 ms	12828 KB	Output is correct
52	Correct	10 ms	12828 KB	Output is correct
53	Correct	12 ms	12836 KB	Output is correct
54	Correct	12 ms	12844 KB	Output is correct
55	Correct	10 ms	12844 KB	Output is correct
56	Correct	10 ms	12844 KB	Output is correct
57	Correct	13 ms	12844 KB	Output is correct
58	Correct	12 ms	12860 KB	Output is correct
59	Correct	618 ms	32160 KB	Output is correct
60	Correct	672 ms	34180 KB	Output is correct
61	Correct	10 ms	34180 KB	Output is correct
62	Correct	10 ms	34180 KB	Output is correct
63	Correct	510 ms	35064 KB	Output is correct
64	Correct	15 ms	35064 KB	Output is correct
65	Correct	25 ms	35064 KB	Output is correct
66	Correct	194 ms	35064 KB	Output is correct
67	Correct	657 ms	46868 KB	Output is correct
68	Correct	689 ms	47764 KB	Output is correct
69	Correct	29 ms	47764 KB	Output is correct
70	Correct	205 ms	47764 KB	Output is correct
71	Correct	691 ms	47764 KB	Output is correct
72	Correct	608 ms	47764 KB	Output is correct
73	Correct	164 ms	47764 KB	Output is correct
74	Correct	739 ms	47764 KB	Output is correct
75	Correct	74 ms	47764 KB	Output is correct
76	Correct	684 ms	47764 KB	Output is correct
77	Correct	696 ms	47764 KB	Output is correct
78	Correct	52 ms	47764 KB	Output is correct
79	Correct	660 ms	47764 KB	Output is correct
80	Correct	15 ms	47764 KB	Output is correct
81	Correct	225 ms	47764 KB	Output is correct
82	Correct	765 ms	47764 KB	Output is correct
83	Correct	709 ms	47764 KB	Output is correct
84	Correct	738 ms	47764 KB	Output is correct
85	Correct	734 ms	47764 KB	Output is correct
86	Correct	784 ms	47764 KB	Output is correct
87	Correct	766 ms	47764 KB	Output is correct

답안 #91096

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