답안 #655830

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
655830	2022-11-05T17:27:32 Z	as111	Network (BOI15_net)	C++14	100 / 100	573 ms	47704 KB

//simple dfs
#include <vector>
#include <iostream>

#define MAXN 500000
#define pb push_back
#define fi first
#define se second
using namespace std;
vector<int> adj[MAXN + 5];
vector<int> leaf;
void dfs(int u, int par)
{
    if (adj[u].size() == 1) leaf.pb(u);
    for (int v : adj[u])
    {
        if (v == par) continue;
        dfs(v, u);
    }
}
void Solve()
{
    dfs(1, 0);
    int l = 0, step = (int)(leaf.size() / 2);
    if (leaf.size() % 2 == 0)
    {
        cout << leaf.size() / 2 << '\n';
        while (l + step < (int)leaf.size())
        {
            cout << leaf[l] << " " << leaf[l + step] << '\n';
            l++;
        }
        return;
    }
    leaf.pb(leaf[0]);
    step++;
    cout << leaf.size() / 2 << '\n';
    while (l + step < leaf.size())
    {
        cout << leaf[l] << " " << leaf[l + step] << '\n';
        l++;
    }
}
int main() {
    int N;
    cin >> N;
    for (int i = 1; i < N; i++)
    {
        int u, v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    Solve();
}

Compilation message

net.cpp: In function 'void Solve()':
net.cpp:38:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     while (l + step < leaf.size())
      |            ~~~~~~~~~^~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	8 ms	11988 KB	Output is correct
3	Correct	6 ms	11940 KB	Output is correct
4	Correct	6 ms	11988 KB	Output is correct
5	Correct	7 ms	12048 KB	Output is correct
6	Correct	7 ms	12048 KB	Output is correct
7	Correct	7 ms	11956 KB	Output is correct
8	Correct	6 ms	11988 KB	Output is correct
9	Correct	6 ms	12028 KB	Output is correct
10	Correct	6 ms	12048 KB	Output is correct
11	Correct	6 ms	11988 KB	Output is correct
12	Correct	7 ms	11988 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	7 ms	11988 KB	Output is correct
15	Correct	7 ms	11920 KB	Output is correct
16	Correct	6 ms	11988 KB	Output is correct
17	Correct	7 ms	11988 KB	Output is correct
18	Correct	7 ms	11988 KB	Output is correct
19	Correct	6 ms	11976 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	8 ms	11988 KB	Output is correct
3	Correct	6 ms	11940 KB	Output is correct
4	Correct	6 ms	11988 KB	Output is correct
5	Correct	7 ms	12048 KB	Output is correct
6	Correct	7 ms	12048 KB	Output is correct
7	Correct	7 ms	11956 KB	Output is correct
8	Correct	6 ms	11988 KB	Output is correct
9	Correct	6 ms	12028 KB	Output is correct
10	Correct	6 ms	12048 KB	Output is correct
11	Correct	6 ms	11988 KB	Output is correct
12	Correct	7 ms	11988 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	7 ms	11988 KB	Output is correct
15	Correct	7 ms	11920 KB	Output is correct
16	Correct	6 ms	11988 KB	Output is correct
17	Correct	7 ms	11988 KB	Output is correct
18	Correct	7 ms	11988 KB	Output is correct
19	Correct	6 ms	11976 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct
21	Correct	6 ms	12040 KB	Output is correct
22	Correct	9 ms	12128 KB	Output is correct
23	Correct	8 ms	12052 KB	Output is correct
24	Correct	8 ms	12056 KB	Output is correct
25	Correct	8 ms	12056 KB	Output is correct
26	Correct	7 ms	12116 KB	Output is correct
27	Correct	8 ms	12056 KB	Output is correct
28	Correct	8 ms	12052 KB	Output is correct
29	Correct	7 ms	12116 KB	Output is correct
30	Correct	7 ms	11988 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	7 ms	11988 KB	Output is correct
33	Correct	6 ms	12040 KB	Output is correct
34	Correct	6 ms	11988 KB	Output is correct
35	Correct	6 ms	11988 KB	Output is correct
36	Correct	6 ms	12040 KB	Output is correct
37	Correct	6 ms	12044 KB	Output is correct
38	Correct	7 ms	12040 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	7 ms	11988 KB	Output is correct
41	Correct	6 ms	11988 KB	Output is correct
42	Correct	6 ms	11988 KB	Output is correct
43	Correct	7 ms	11988 KB	Output is correct
44	Correct	6 ms	11988 KB	Output is correct
45	Correct	7 ms	12044 KB	Output is correct
46	Correct	7 ms	12040 KB	Output is correct
47	Correct	8 ms	11924 KB	Output is correct
48	Correct	7 ms	11988 KB	Output is correct
49	Correct	7 ms	11988 KB	Output is correct
50	Correct	8 ms	12040 KB	Output is correct
51	Correct	7 ms	12044 KB	Output is correct
52	Correct	7 ms	12044 KB	Output is correct
53	Correct	7 ms	11988 KB	Output is correct
54	Correct	7 ms	11988 KB	Output is correct
55	Correct	7 ms	12044 KB	Output is correct
56	Correct	7 ms	11988 KB	Output is correct
57	Correct	7 ms	11988 KB	Output is correct
58	Correct	8 ms	12116 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	8 ms	11988 KB	Output is correct
3	Correct	6 ms	11940 KB	Output is correct
4	Correct	6 ms	11988 KB	Output is correct
5	Correct	7 ms	12048 KB	Output is correct
6	Correct	7 ms	12048 KB	Output is correct
7	Correct	7 ms	11956 KB	Output is correct
8	Correct	6 ms	11988 KB	Output is correct
9	Correct	6 ms	12028 KB	Output is correct
10	Correct	6 ms	12048 KB	Output is correct
11	Correct	6 ms	11988 KB	Output is correct
12	Correct	7 ms	11988 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	7 ms	11988 KB	Output is correct
15	Correct	7 ms	11920 KB	Output is correct
16	Correct	6 ms	11988 KB	Output is correct
17	Correct	7 ms	11988 KB	Output is correct
18	Correct	7 ms	11988 KB	Output is correct
19	Correct	6 ms	11976 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct
21	Correct	6 ms	12040 KB	Output is correct
22	Correct	9 ms	12128 KB	Output is correct
23	Correct	8 ms	12052 KB	Output is correct
24	Correct	8 ms	12056 KB	Output is correct
25	Correct	8 ms	12056 KB	Output is correct
26	Correct	7 ms	12116 KB	Output is correct
27	Correct	8 ms	12056 KB	Output is correct
28	Correct	8 ms	12052 KB	Output is correct
29	Correct	7 ms	12116 KB	Output is correct
30	Correct	7 ms	11988 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	7 ms	11988 KB	Output is correct
33	Correct	6 ms	12040 KB	Output is correct
34	Correct	6 ms	11988 KB	Output is correct
35	Correct	6 ms	11988 KB	Output is correct
36	Correct	6 ms	12040 KB	Output is correct
37	Correct	6 ms	12044 KB	Output is correct
38	Correct	7 ms	12040 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	7 ms	11988 KB	Output is correct
41	Correct	6 ms	11988 KB	Output is correct
42	Correct	6 ms	11988 KB	Output is correct
43	Correct	7 ms	11988 KB	Output is correct
44	Correct	6 ms	11988 KB	Output is correct
45	Correct	7 ms	12044 KB	Output is correct
46	Correct	7 ms	12040 KB	Output is correct
47	Correct	8 ms	11924 KB	Output is correct
48	Correct	7 ms	11988 KB	Output is correct
49	Correct	7 ms	11988 KB	Output is correct
50	Correct	8 ms	12040 KB	Output is correct
51	Correct	7 ms	12044 KB	Output is correct
52	Correct	7 ms	12044 KB	Output is correct
53	Correct	7 ms	11988 KB	Output is correct
54	Correct	7 ms	11988 KB	Output is correct
55	Correct	7 ms	12044 KB	Output is correct
56	Correct	7 ms	11988 KB	Output is correct
57	Correct	7 ms	11988 KB	Output is correct
58	Correct	8 ms	12116 KB	Output is correct
59	Correct	472 ms	35952 KB	Output is correct
60	Correct	545 ms	38656 KB	Output is correct
61	Correct	6 ms	11988 KB	Output is correct
62	Correct	7 ms	12040 KB	Output is correct
63	Correct	399 ms	33596 KB	Output is correct
64	Correct	9 ms	12364 KB	Output is correct
65	Correct	25 ms	13852 KB	Output is correct
66	Correct	175 ms	27820 KB	Output is correct
67	Correct	573 ms	46896 KB	Output is correct
68	Correct	569 ms	47704 KB	Output is correct
69	Correct	15 ms	12884 KB	Output is correct
70	Correct	127 ms	21172 KB	Output is correct
71	Correct	432 ms	41984 KB	Output is correct
72	Correct	429 ms	40700 KB	Output is correct
73	Correct	121 ms	19056 KB	Output is correct
74	Correct	533 ms	37660 KB	Output is correct
75	Correct	44 ms	15180 KB	Output is correct
76	Correct	438 ms	41508 KB	Output is correct
77	Correct	442 ms	41616 KB	Output is correct
78	Correct	44 ms	15244 KB	Output is correct
79	Correct	572 ms	45156 KB	Output is correct
80	Correct	8 ms	12244 KB	Output is correct
81	Correct	142 ms	21284 KB	Output is correct
82	Correct	510 ms	39528 KB	Output is correct
83	Correct	544 ms	37756 KB	Output is correct
84	Correct	552 ms	37692 KB	Output is correct
85	Correct	557 ms	37616 KB	Output is correct
86	Correct	540 ms	38716 KB	Output is correct
87	Correct	562 ms	38720 KB	Output is correct

답안 #655830

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