답안 #394455

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
394455	2021-04-26T16:45:16 Z	Alma	Network (BOI15_net)	C++14	100 / 100	487 ms	51944 KB

#include <bits/stdc++.h>
using namespace std;

vector<int> a;

void f (int p, int n, vector<vector<int>> & g) {
    if ((int)g[n].size() == 1) a.push_back(n);
    for (int c: g[n]) {
        if (c != p) f (n, c, g);
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    int n, u, v, s;
    cin >> n;
    vector<vector<int>> g(n, vector<int>());
    for (int i = 0; i < n-1; i++) {
        cin >> u >> v;
        u--; v--;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    f (-1, 0, g);
    cout << ((int)a.size() + 1) / 2 << '\n';
    s = (int)a.size() / 2;
    for (int i = 0; i < s; i++) {
        cout << a[i] + 1 << ' ' << a[s+i] + 1 << '\n';
    }
    s = (int)a.size();
    if (s % 2 == 1) cout << a[0] + 1 << ' ' << a[s-1] + 1 << '\n';
    return 0;
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	1 ms	460 KB	Output is correct
23	Correct	1 ms	460 KB	Output is correct
24	Correct	1 ms	332 KB	Output is correct
25	Correct	1 ms	332 KB	Output is correct
26	Correct	1 ms	332 KB	Output is correct
27	Correct	2 ms	332 KB	Output is correct
28	Correct	1 ms	332 KB	Output is correct
29	Correct	1 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	1 ms	332 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	328 KB	Output is correct
34	Correct	1 ms	204 KB	Output is correct
35	Correct	1 ms	204 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	1 ms	332 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	204 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	328 KB	Output is correct
44	Correct	1 ms	316 KB	Output is correct
45	Correct	1 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	204 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	1 ms	204 KB	Output is correct
51	Correct	1 ms	204 KB	Output is correct
52	Correct	1 ms	336 KB	Output is correct
53	Correct	1 ms	332 KB	Output is correct
54	Correct	1 ms	204 KB	Output is correct
55	Correct	1 ms	332 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	332 KB	Output is correct
58	Correct	1 ms	460 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	1 ms	460 KB	Output is correct
23	Correct	1 ms	460 KB	Output is correct
24	Correct	1 ms	332 KB	Output is correct
25	Correct	1 ms	332 KB	Output is correct
26	Correct	1 ms	332 KB	Output is correct
27	Correct	2 ms	332 KB	Output is correct
28	Correct	1 ms	332 KB	Output is correct
29	Correct	1 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	1 ms	332 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	328 KB	Output is correct
34	Correct	1 ms	204 KB	Output is correct
35	Correct	1 ms	204 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	1 ms	332 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	204 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	328 KB	Output is correct
44	Correct	1 ms	316 KB	Output is correct
45	Correct	1 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	204 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	1 ms	204 KB	Output is correct
51	Correct	1 ms	204 KB	Output is correct
52	Correct	1 ms	336 KB	Output is correct
53	Correct	1 ms	332 KB	Output is correct
54	Correct	1 ms	204 KB	Output is correct
55	Correct	1 ms	332 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	332 KB	Output is correct
58	Correct	1 ms	460 KB	Output is correct
59	Correct	375 ms	34916 KB	Output is correct
60	Correct	442 ms	38768 KB	Output is correct
61	Correct	1 ms	204 KB	Output is correct
62	Correct	1 ms	204 KB	Output is correct
63	Correct	327 ms	31288 KB	Output is correct
64	Correct	3 ms	844 KB	Output is correct
65	Correct	12 ms	2996 KB	Output is correct
66	Correct	131 ms	22988 KB	Output is correct
67	Correct	485 ms	51140 KB	Output is correct
68	Correct	487 ms	51944 KB	Output is correct
69	Correct	7 ms	1484 KB	Output is correct
70	Correct	83 ms	13272 KB	Output is correct
71	Correct	307 ms	41924 KB	Output is correct
72	Correct	329 ms	40800 KB	Output is correct
73	Correct	92 ms	10564 KB	Output is correct
74	Correct	430 ms	37680 KB	Output is correct
75	Correct	23 ms	4804 KB	Output is correct
76	Correct	319 ms	41620 KB	Output is correct
77	Correct	316 ms	41636 KB	Output is correct
78	Correct	26 ms	5060 KB	Output is correct
79	Correct	474 ms	48848 KB	Output is correct
80	Correct	2 ms	588 KB	Output is correct
81	Correct	97 ms	13464 KB	Output is correct
82	Correct	386 ms	39632 KB	Output is correct
83	Correct	452 ms	37808 KB	Output is correct
84	Correct	457 ms	37604 KB	Output is correct
85	Correct	443 ms	37644 KB	Output is correct
86	Correct	442 ms	38780 KB	Output is correct
87	Correct	455 ms	38712 KB	Output is correct

답안 #394455

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