답안 #79560 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
79560	2018-10-15T03:06:36 Z	FutymyClone	Network (BOI15_net)	C++14	100 / 100	663 ms	41528 KB

#include <bits/stdc++.h>

using namespace std;

const int N = 5e5 + 5;

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

void dfs (int u, int p) {
    bool leaf = true;
    for (auto v: g[u]) {
        if (v == p) continue;
        leaf = false;
        dfs(v, u);
    }

    if (leaf) vec.push_back(u);
}

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

    for (int i = 1; i <= n; i++) {
        if (g[i].size() > 1) {
            dfs(i, i);
            break;
        }
    }

    printf("%d\n", ((int)vec.size() + 1) / 2);
    for (int i = 0; i < ((int)vec.size() + 1) / 2; i++) printf("%d %d\n", vec[i], vec[i + vec.size() / 2]);
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
net.cpp:24:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int u, v; scanf("%d %d", &u, &v);
                   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	12 ms	12028 KB	Output is correct
3	Correct	12 ms	12200 KB	Output is correct
4	Correct	16 ms	12200 KB	Output is correct
5	Correct	16 ms	12232 KB	Output is correct
6	Correct	12 ms	12268 KB	Output is correct
7	Correct	12 ms	12268 KB	Output is correct
8	Correct	12 ms	12268 KB	Output is correct
9	Correct	12 ms	12268 KB	Output is correct
10	Correct	12 ms	12268 KB	Output is correct
11	Correct	13 ms	12268 KB	Output is correct
12	Correct	12 ms	12280 KB	Output is correct
13	Correct	12 ms	12280 KB	Output is correct
14	Correct	12 ms	12372 KB	Output is correct
15	Correct	12 ms	12372 KB	Output is correct
16	Correct	15 ms	12372 KB	Output is correct
17	Correct	12 ms	12372 KB	Output is correct
18	Correct	12 ms	12372 KB	Output is correct
19	Correct	12 ms	12372 KB	Output is correct
20	Correct	12 ms	12372 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	12 ms	12028 KB	Output is correct
3	Correct	12 ms	12200 KB	Output is correct
4	Correct	16 ms	12200 KB	Output is correct
5	Correct	16 ms	12232 KB	Output is correct
6	Correct	12 ms	12268 KB	Output is correct
7	Correct	12 ms	12268 KB	Output is correct
8	Correct	12 ms	12268 KB	Output is correct
9	Correct	12 ms	12268 KB	Output is correct
10	Correct	12 ms	12268 KB	Output is correct
11	Correct	13 ms	12268 KB	Output is correct
12	Correct	12 ms	12280 KB	Output is correct
13	Correct	12 ms	12280 KB	Output is correct
14	Correct	12 ms	12372 KB	Output is correct
15	Correct	12 ms	12372 KB	Output is correct
16	Correct	15 ms	12372 KB	Output is correct
17	Correct	12 ms	12372 KB	Output is correct
18	Correct	12 ms	12372 KB	Output is correct
19	Correct	12 ms	12372 KB	Output is correct
20	Correct	12 ms	12372 KB	Output is correct
21	Correct	12 ms	12372 KB	Output is correct
22	Correct	13 ms	12412 KB	Output is correct
23	Correct	13 ms	12412 KB	Output is correct
24	Correct	13 ms	12428 KB	Output is correct
25	Correct	15 ms	12460 KB	Output is correct
26	Correct	13 ms	12460 KB	Output is correct
27	Correct	12 ms	12460 KB	Output is correct
28	Correct	16 ms	12460 KB	Output is correct
29	Correct	13 ms	12604 KB	Output is correct
30	Correct	12 ms	12604 KB	Output is correct
31	Correct	13 ms	12604 KB	Output is correct
32	Correct	14 ms	12604 KB	Output is correct
33	Correct	12 ms	12604 KB	Output is correct
34	Correct	12 ms	12604 KB	Output is correct
35	Correct	12 ms	12604 KB	Output is correct
36	Correct	12 ms	12604 KB	Output is correct
37	Correct	12 ms	12604 KB	Output is correct
38	Correct	13 ms	12604 KB	Output is correct
39	Correct	23 ms	12604 KB	Output is correct
40	Correct	13 ms	12604 KB	Output is correct
41	Correct	11 ms	12604 KB	Output is correct
42	Correct	12 ms	12604 KB	Output is correct
43	Correct	12 ms	12604 KB	Output is correct
44	Correct	13 ms	12604 KB	Output is correct
45	Correct	12 ms	12604 KB	Output is correct
46	Correct	14 ms	12604 KB	Output is correct
47	Correct	13 ms	12604 KB	Output is correct
48	Correct	12 ms	12604 KB	Output is correct
49	Correct	12 ms	12604 KB	Output is correct
50	Correct	14 ms	12604 KB	Output is correct
51	Correct	12 ms	12604 KB	Output is correct
52	Correct	12 ms	12604 KB	Output is correct
53	Correct	12 ms	12604 KB	Output is correct
54	Correct	12 ms	12604 KB	Output is correct
55	Correct	12 ms	12604 KB	Output is correct
56	Correct	11 ms	12604 KB	Output is correct
57	Correct	12 ms	12604 KB	Output is correct
58	Correct	13 ms	12604 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	12 ms	12028 KB	Output is correct
3	Correct	12 ms	12200 KB	Output is correct
4	Correct	16 ms	12200 KB	Output is correct
5	Correct	16 ms	12232 KB	Output is correct
6	Correct	12 ms	12268 KB	Output is correct
7	Correct	12 ms	12268 KB	Output is correct
8	Correct	12 ms	12268 KB	Output is correct
9	Correct	12 ms	12268 KB	Output is correct
10	Correct	12 ms	12268 KB	Output is correct
11	Correct	13 ms	12268 KB	Output is correct
12	Correct	12 ms	12280 KB	Output is correct
13	Correct	12 ms	12280 KB	Output is correct
14	Correct	12 ms	12372 KB	Output is correct
15	Correct	12 ms	12372 KB	Output is correct
16	Correct	15 ms	12372 KB	Output is correct
17	Correct	12 ms	12372 KB	Output is correct
18	Correct	12 ms	12372 KB	Output is correct
19	Correct	12 ms	12372 KB	Output is correct
20	Correct	12 ms	12372 KB	Output is correct
21	Correct	12 ms	12372 KB	Output is correct
22	Correct	13 ms	12412 KB	Output is correct
23	Correct	13 ms	12412 KB	Output is correct
24	Correct	13 ms	12428 KB	Output is correct
25	Correct	15 ms	12460 KB	Output is correct
26	Correct	13 ms	12460 KB	Output is correct
27	Correct	12 ms	12460 KB	Output is correct
28	Correct	16 ms	12460 KB	Output is correct
29	Correct	13 ms	12604 KB	Output is correct
30	Correct	12 ms	12604 KB	Output is correct
31	Correct	13 ms	12604 KB	Output is correct
32	Correct	14 ms	12604 KB	Output is correct
33	Correct	12 ms	12604 KB	Output is correct
34	Correct	12 ms	12604 KB	Output is correct
35	Correct	12 ms	12604 KB	Output is correct
36	Correct	12 ms	12604 KB	Output is correct
37	Correct	12 ms	12604 KB	Output is correct
38	Correct	13 ms	12604 KB	Output is correct
39	Correct	23 ms	12604 KB	Output is correct
40	Correct	13 ms	12604 KB	Output is correct
41	Correct	11 ms	12604 KB	Output is correct
42	Correct	12 ms	12604 KB	Output is correct
43	Correct	12 ms	12604 KB	Output is correct
44	Correct	13 ms	12604 KB	Output is correct
45	Correct	12 ms	12604 KB	Output is correct
46	Correct	14 ms	12604 KB	Output is correct
47	Correct	13 ms	12604 KB	Output is correct
48	Correct	12 ms	12604 KB	Output is correct
49	Correct	12 ms	12604 KB	Output is correct
50	Correct	14 ms	12604 KB	Output is correct
51	Correct	12 ms	12604 KB	Output is correct
52	Correct	12 ms	12604 KB	Output is correct
53	Correct	12 ms	12604 KB	Output is correct
54	Correct	12 ms	12604 KB	Output is correct
55	Correct	12 ms	12604 KB	Output is correct
56	Correct	11 ms	12604 KB	Output is correct
57	Correct	12 ms	12604 KB	Output is correct
58	Correct	13 ms	12604 KB	Output is correct
59	Correct	465 ms	30352 KB	Output is correct
60	Correct	520 ms	32412 KB	Output is correct
61	Correct	13 ms	32412 KB	Output is correct
62	Correct	12 ms	32412 KB	Output is correct
63	Correct	404 ms	32412 KB	Output is correct
64	Correct	16 ms	32412 KB	Output is correct
65	Correct	27 ms	32412 KB	Output is correct
66	Correct	194 ms	32412 KB	Output is correct
67	Correct	595 ms	40712 KB	Output is correct
68	Correct	663 ms	41528 KB	Output is correct
69	Correct	20 ms	41528 KB	Output is correct
70	Correct	123 ms	41528 KB	Output is correct
71	Correct	389 ms	41528 KB	Output is correct
72	Correct	392 ms	41528 KB	Output is correct
73	Correct	123 ms	41528 KB	Output is correct
74	Correct	596 ms	41528 KB	Output is correct
75	Correct	42 ms	41528 KB	Output is correct
76	Correct	401 ms	41528 KB	Output is correct
77	Correct	382 ms	41528 KB	Output is correct
78	Correct	60 ms	41528 KB	Output is correct
79	Correct	621 ms	41528 KB	Output is correct
80	Correct	15 ms	41528 KB	Output is correct
81	Correct	161 ms	41528 KB	Output is correct
82	Correct	472 ms	41528 KB	Output is correct
83	Correct	552 ms	41528 KB	Output is correct
84	Correct	551 ms	41528 KB	Output is correct
85	Correct	515 ms	41528 KB	Output is correct
86	Correct	572 ms	41528 KB	Output is correct
87	Correct	564 ms	41528 KB	Output is correct

답안 #79560

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