Submission #134329

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
134329	2019-07-22T12:51:50 Z	Kastanda	Network (BOI15_net)	C++11	100 / 100	611 ms	57800 KB

// ItnoE
#include<bits/stdc++.h>
using namespace std;
const int N = 500005;
int n;
vector < int > V, Adj[N];
void DFS(int v, int p)
{
    for (int &u : Adj[v])
        if (u != p)
            DFS(u, v);
    if (Adj[v].size() == 1)
        V.push_back(v);
}
int main()
{
    scanf("%d", &n);
    for (int i = 1; i < n; i ++)
    {
        int v, u;
        scanf("%d%d", &v, &u);
        Adj[v].push_back(u);
        Adj[u].push_back(v);
    }
    int root = 1;
    for (int i = 1; i <= n; i ++)
        if (Adj[i].size() > 1)
            root = i;
    DFS(root, 0);
    printf("%d\n", (int)(V.size() + 1) / 2);
    for (int i = 0; i < (V.size() + 1) / 2; i ++)
        printf("%d %d\n", V[i], V[i + (int)V.size() / 2]);
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < (V.size() + 1) / 2; i ++)
                     ~~^~~~~~~~~~~~~~~~~~~~
net.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
net.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &v, &u);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	12 ms	12028 KB	Output is correct
2	Correct	13 ms	12024 KB	Output is correct
3	Correct	13 ms	12028 KB	Output is correct
4	Correct	13 ms	12016 KB	Output is correct
5	Correct	13 ms	12024 KB	Output is correct
6	Correct	13 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	12 ms	12028 KB	Output is correct
9	Correct	12 ms	12024 KB	Output is correct
10	Correct	12 ms	12024 KB	Output is correct
11	Correct	12 ms	12024 KB	Output is correct
12	Correct	13 ms	12024 KB	Output is correct
13	Correct	13 ms	12024 KB	Output is correct
14	Correct	12 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	13 ms	12024 KB	Output is correct
18	Correct	15 ms	12024 KB	Output is correct
19	Correct	12 ms	12152 KB	Output is correct
20	Correct	12 ms	12024 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	12 ms	12028 KB	Output is correct
2	Correct	13 ms	12024 KB	Output is correct
3	Correct	13 ms	12028 KB	Output is correct
4	Correct	13 ms	12016 KB	Output is correct
5	Correct	13 ms	12024 KB	Output is correct
6	Correct	13 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	12 ms	12028 KB	Output is correct
9	Correct	12 ms	12024 KB	Output is correct
10	Correct	12 ms	12024 KB	Output is correct
11	Correct	12 ms	12024 KB	Output is correct
12	Correct	13 ms	12024 KB	Output is correct
13	Correct	13 ms	12024 KB	Output is correct
14	Correct	12 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	13 ms	12024 KB	Output is correct
18	Correct	15 ms	12024 KB	Output is correct
19	Correct	12 ms	12152 KB	Output is correct
20	Correct	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12180 KB	Output is correct
22	Correct	16 ms	12152 KB	Output is correct
23	Correct	13 ms	12152 KB	Output is correct
24	Correct	15 ms	12152 KB	Output is correct
25	Correct	15 ms	12152 KB	Output is correct
26	Correct	13 ms	12152 KB	Output is correct
27	Correct	13 ms	12152 KB	Output is correct
28	Correct	13 ms	12152 KB	Output is correct
29	Correct	13 ms	12152 KB	Output is correct
30	Correct	13 ms	12024 KB	Output is correct
31	Correct	15 ms	12152 KB	Output is correct
32	Correct	15 ms	12024 KB	Output is correct
33	Correct	12 ms	12024 KB	Output is correct
34	Correct	12 ms	12024 KB	Output is correct
35	Correct	12 ms	12024 KB	Output is correct
36	Correct	12 ms	12024 KB	Output is correct
37	Correct	12 ms	12024 KB	Output is correct
38	Correct	15 ms	12152 KB	Output is correct
39	Correct	15 ms	12024 KB	Output is correct
40	Correct	12 ms	12024 KB	Output is correct
41	Correct	13 ms	12024 KB	Output is correct
42	Correct	13 ms	12152 KB	Output is correct
43	Correct	13 ms	12152 KB	Output is correct
44	Correct	16 ms	12024 KB	Output is correct
45	Correct	16 ms	12152 KB	Output is correct
46	Correct	14 ms	12024 KB	Output is correct
47	Correct	12 ms	12024 KB	Output is correct
48	Correct	15 ms	12152 KB	Output is correct
49	Correct	13 ms	12152 KB	Output is correct
50	Correct	12 ms	12024 KB	Output is correct
51	Correct	13 ms	12024 KB	Output is correct
52	Correct	12 ms	12152 KB	Output is correct
53	Correct	13 ms	12152 KB	Output is correct
54	Correct	13 ms	12028 KB	Output is correct
55	Correct	12 ms	12024 KB	Output is correct
56	Correct	12 ms	12024 KB	Output is correct
57	Correct	13 ms	12152 KB	Output is correct
58	Correct	13 ms	12152 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	12 ms	12028 KB	Output is correct
2	Correct	13 ms	12024 KB	Output is correct
3	Correct	13 ms	12028 KB	Output is correct
4	Correct	13 ms	12016 KB	Output is correct
5	Correct	13 ms	12024 KB	Output is correct
6	Correct	13 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	12 ms	12028 KB	Output is correct
9	Correct	12 ms	12024 KB	Output is correct
10	Correct	12 ms	12024 KB	Output is correct
11	Correct	12 ms	12024 KB	Output is correct
12	Correct	13 ms	12024 KB	Output is correct
13	Correct	13 ms	12024 KB	Output is correct
14	Correct	12 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	13 ms	12024 KB	Output is correct
18	Correct	15 ms	12024 KB	Output is correct
19	Correct	12 ms	12152 KB	Output is correct
20	Correct	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12180 KB	Output is correct
22	Correct	16 ms	12152 KB	Output is correct
23	Correct	13 ms	12152 KB	Output is correct
24	Correct	15 ms	12152 KB	Output is correct
25	Correct	15 ms	12152 KB	Output is correct
26	Correct	13 ms	12152 KB	Output is correct
27	Correct	13 ms	12152 KB	Output is correct
28	Correct	13 ms	12152 KB	Output is correct
29	Correct	13 ms	12152 KB	Output is correct
30	Correct	13 ms	12024 KB	Output is correct
31	Correct	15 ms	12152 KB	Output is correct
32	Correct	15 ms	12024 KB	Output is correct
33	Correct	12 ms	12024 KB	Output is correct
34	Correct	12 ms	12024 KB	Output is correct
35	Correct	12 ms	12024 KB	Output is correct
36	Correct	12 ms	12024 KB	Output is correct
37	Correct	12 ms	12024 KB	Output is correct
38	Correct	15 ms	12152 KB	Output is correct
39	Correct	15 ms	12024 KB	Output is correct
40	Correct	12 ms	12024 KB	Output is correct
41	Correct	13 ms	12024 KB	Output is correct
42	Correct	13 ms	12152 KB	Output is correct
43	Correct	13 ms	12152 KB	Output is correct
44	Correct	16 ms	12024 KB	Output is correct
45	Correct	16 ms	12152 KB	Output is correct
46	Correct	14 ms	12024 KB	Output is correct
47	Correct	12 ms	12024 KB	Output is correct
48	Correct	15 ms	12152 KB	Output is correct
49	Correct	13 ms	12152 KB	Output is correct
50	Correct	12 ms	12024 KB	Output is correct
51	Correct	13 ms	12024 KB	Output is correct
52	Correct	12 ms	12152 KB	Output is correct
53	Correct	13 ms	12152 KB	Output is correct
54	Correct	13 ms	12028 KB	Output is correct
55	Correct	12 ms	12024 KB	Output is correct
56	Correct	12 ms	12024 KB	Output is correct
57	Correct	13 ms	12152 KB	Output is correct
58	Correct	13 ms	12152 KB	Output is correct
59	Correct	423 ms	36096 KB	Output is correct
60	Correct	500 ms	38760 KB	Output is correct
61	Correct	15 ms	12024 KB	Output is correct
62	Correct	13 ms	12024 KB	Output is correct
63	Correct	368 ms	33768 KB	Output is correct
64	Correct	18 ms	12408 KB	Output is correct
65	Correct	27 ms	13816 KB	Output is correct
66	Correct	179 ms	25128 KB	Output is correct
67	Correct	611 ms	57800 KB	Output is correct
68	Correct	587 ms	50676 KB	Output is correct
69	Correct	20 ms	12920 KB	Output is correct
70	Correct	113 ms	21244 KB	Output is correct
71	Correct	348 ms	41952 KB	Output is correct
72	Correct	440 ms	40676 KB	Output is correct
73	Correct	117 ms	19124 KB	Output is correct
74	Correct	510 ms	37692 KB	Output is correct
75	Correct	47 ms	15224 KB	Output is correct
76	Correct	361 ms	41652 KB	Output is correct
77	Correct	394 ms	41692 KB	Output is correct
78	Correct	49 ms	15480 KB	Output is correct
79	Correct	552 ms	45292 KB	Output is correct
80	Correct	14 ms	12280 KB	Output is correct
81	Correct	135 ms	21360 KB	Output is correct
82	Correct	437 ms	39508 KB	Output is correct
83	Correct	507 ms	37744 KB	Output is correct
84	Correct	512 ms	37728 KB	Output is correct
85	Correct	522 ms	37772 KB	Output is correct
86	Correct	508 ms	38888 KB	Output is correct
87	Correct	503 ms	38816 KB	Output is correct

Submission #134329

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