답안 #79559 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
79559	2018-10-15T03:05:27 Z	IOrtroiii	Network (BOI15_net)	C++14	100 / 100	687 ms	41524 KB

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

const int N = 500005;

int n;
vector<int> g[N];
vector<int> leaves;

void dfs(int u,int p) {
   bool leaf = 1;
   for (int v : g[u]) if (v != p) {
      dfs(v, u); leaf = 0;
   }
   if (leaf) leaves.push_back(u);
}

int main() {
   ios_base::sync_with_stdio(false);
   cin >> n;
   for (int i = 1; i <= n - 1; ++i) {
      int u, v; cin >> u >> v;
      g[u].push_back(v), g[v].push_back(u);
   }
   int root = -1;
   for (int i = 1; i <= n; ++i) if (g[i].size() >= 2) {
      root = i; break;
   }
   dfs(root, -1);
   int sz = leaves.size();
   cout << ((sz + 1) / 2) << '\n';
   if (sz & 1) {
      cout << leaves[sz / 2] << ' ' << root << '\n';
      for (int i = 0; i < (sz / 2); ++i) {
         cout << leaves[i] << ' ' << leaves[i + (sz / 2) + 1] << '\n';
      }
   }
   else {
      for (int i = 0; i < (sz / 2); ++i) {
         cout << leaves[i] << ' ' << leaves[i + (sz / 2)] << '\n';
      }
   }
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	14 ms	12280 KB	Output is correct
2	Correct	12 ms	12280 KB	Output is correct
3	Correct	11 ms	12280 KB	Output is correct
4	Correct	12 ms	12280 KB	Output is correct
5	Correct	12 ms	12380 KB	Output is correct
6	Correct	12 ms	12380 KB	Output is correct
7	Correct	12 ms	12380 KB	Output is correct
8	Correct	12 ms	12380 KB	Output is correct
9	Correct	16 ms	12380 KB	Output is correct
10	Correct	12 ms	12380 KB	Output is correct
11	Correct	11 ms	12380 KB	Output is correct
12	Correct	12 ms	12380 KB	Output is correct
13	Correct	14 ms	12380 KB	Output is correct
14	Correct	12 ms	12380 KB	Output is correct
15	Correct	13 ms	12380 KB	Output is correct
16	Correct	12 ms	12380 KB	Output is correct
17	Correct	12 ms	12380 KB	Output is correct
18	Correct	12 ms	12380 KB	Output is correct
19	Correct	11 ms	12380 KB	Output is correct
20	Correct	12 ms	12380 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	14 ms	12280 KB	Output is correct
2	Correct	12 ms	12280 KB	Output is correct
3	Correct	11 ms	12280 KB	Output is correct
4	Correct	12 ms	12280 KB	Output is correct
5	Correct	12 ms	12380 KB	Output is correct
6	Correct	12 ms	12380 KB	Output is correct
7	Correct	12 ms	12380 KB	Output is correct
8	Correct	12 ms	12380 KB	Output is correct
9	Correct	16 ms	12380 KB	Output is correct
10	Correct	12 ms	12380 KB	Output is correct
11	Correct	11 ms	12380 KB	Output is correct
12	Correct	12 ms	12380 KB	Output is correct
13	Correct	14 ms	12380 KB	Output is correct
14	Correct	12 ms	12380 KB	Output is correct
15	Correct	13 ms	12380 KB	Output is correct
16	Correct	12 ms	12380 KB	Output is correct
17	Correct	12 ms	12380 KB	Output is correct
18	Correct	12 ms	12380 KB	Output is correct
19	Correct	11 ms	12380 KB	Output is correct
20	Correct	12 ms	12380 KB	Output is correct
21	Correct	12 ms	12380 KB	Output is correct
22	Correct	12 ms	12384 KB	Output is correct
23	Correct	13 ms	12384 KB	Output is correct
24	Correct	13 ms	12400 KB	Output is correct
25	Correct	12 ms	12416 KB	Output is correct
26	Correct	16 ms	12432 KB	Output is correct
27	Correct	17 ms	12432 KB	Output is correct
28	Correct	12 ms	12444 KB	Output is correct
29	Correct	12 ms	12444 KB	Output is correct
30	Correct	14 ms	12444 KB	Output is correct
31	Correct	17 ms	12460 KB	Output is correct
32	Correct	12 ms	12460 KB	Output is correct
33	Correct	11 ms	12460 KB	Output is correct
34	Correct	12 ms	12492 KB	Output is correct
35	Correct	12 ms	12492 KB	Output is correct
36	Correct	12 ms	12492 KB	Output is correct
37	Correct	13 ms	12492 KB	Output is correct
38	Correct	13 ms	12596 KB	Output is correct
39	Correct	16 ms	12596 KB	Output is correct
40	Correct	11 ms	12596 KB	Output is correct
41	Correct	12 ms	12596 KB	Output is correct
42	Correct	13 ms	12596 KB	Output is correct
43	Correct	14 ms	12596 KB	Output is correct
44	Correct	12 ms	12596 KB	Output is correct
45	Correct	12 ms	12596 KB	Output is correct
46	Correct	13 ms	12596 KB	Output is correct
47	Correct	12 ms	12596 KB	Output is correct
48	Correct	13 ms	12596 KB	Output is correct
49	Correct	14 ms	12596 KB	Output is correct
50	Correct	13 ms	12596 KB	Output is correct
51	Correct	13 ms	12596 KB	Output is correct
52	Correct	12 ms	12596 KB	Output is correct
53	Correct	13 ms	12596 KB	Output is correct
54	Correct	16 ms	12596 KB	Output is correct
55	Correct	16 ms	12596 KB	Output is correct
56	Correct	16 ms	12596 KB	Output is correct
57	Correct	12 ms	12596 KB	Output is correct
58	Correct	17 ms	12596 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	14 ms	12280 KB	Output is correct
2	Correct	12 ms	12280 KB	Output is correct
3	Correct	11 ms	12280 KB	Output is correct
4	Correct	12 ms	12280 KB	Output is correct
5	Correct	12 ms	12380 KB	Output is correct
6	Correct	12 ms	12380 KB	Output is correct
7	Correct	12 ms	12380 KB	Output is correct
8	Correct	12 ms	12380 KB	Output is correct
9	Correct	16 ms	12380 KB	Output is correct
10	Correct	12 ms	12380 KB	Output is correct
11	Correct	11 ms	12380 KB	Output is correct
12	Correct	12 ms	12380 KB	Output is correct
13	Correct	14 ms	12380 KB	Output is correct
14	Correct	12 ms	12380 KB	Output is correct
15	Correct	13 ms	12380 KB	Output is correct
16	Correct	12 ms	12380 KB	Output is correct
17	Correct	12 ms	12380 KB	Output is correct
18	Correct	12 ms	12380 KB	Output is correct
19	Correct	11 ms	12380 KB	Output is correct
20	Correct	12 ms	12380 KB	Output is correct
21	Correct	12 ms	12380 KB	Output is correct
22	Correct	12 ms	12384 KB	Output is correct
23	Correct	13 ms	12384 KB	Output is correct
24	Correct	13 ms	12400 KB	Output is correct
25	Correct	12 ms	12416 KB	Output is correct
26	Correct	16 ms	12432 KB	Output is correct
27	Correct	17 ms	12432 KB	Output is correct
28	Correct	12 ms	12444 KB	Output is correct
29	Correct	12 ms	12444 KB	Output is correct
30	Correct	14 ms	12444 KB	Output is correct
31	Correct	17 ms	12460 KB	Output is correct
32	Correct	12 ms	12460 KB	Output is correct
33	Correct	11 ms	12460 KB	Output is correct
34	Correct	12 ms	12492 KB	Output is correct
35	Correct	12 ms	12492 KB	Output is correct
36	Correct	12 ms	12492 KB	Output is correct
37	Correct	13 ms	12492 KB	Output is correct
38	Correct	13 ms	12596 KB	Output is correct
39	Correct	16 ms	12596 KB	Output is correct
40	Correct	11 ms	12596 KB	Output is correct
41	Correct	12 ms	12596 KB	Output is correct
42	Correct	13 ms	12596 KB	Output is correct
43	Correct	14 ms	12596 KB	Output is correct
44	Correct	12 ms	12596 KB	Output is correct
45	Correct	12 ms	12596 KB	Output is correct
46	Correct	13 ms	12596 KB	Output is correct
47	Correct	12 ms	12596 KB	Output is correct
48	Correct	13 ms	12596 KB	Output is correct
49	Correct	14 ms	12596 KB	Output is correct
50	Correct	13 ms	12596 KB	Output is correct
51	Correct	13 ms	12596 KB	Output is correct
52	Correct	12 ms	12596 KB	Output is correct
53	Correct	13 ms	12596 KB	Output is correct
54	Correct	16 ms	12596 KB	Output is correct
55	Correct	16 ms	12596 KB	Output is correct
56	Correct	16 ms	12596 KB	Output is correct
57	Correct	12 ms	12596 KB	Output is correct
58	Correct	17 ms	12596 KB	Output is correct
59	Correct	457 ms	30564 KB	Output is correct
60	Correct	589 ms	32556 KB	Output is correct
61	Correct	13 ms	32556 KB	Output is correct
62	Correct	12 ms	32556 KB	Output is correct
63	Correct	423 ms	32556 KB	Output is correct
64	Correct	16 ms	32556 KB	Output is correct
65	Correct	25 ms	32556 KB	Output is correct
66	Correct	196 ms	32556 KB	Output is correct
67	Correct	687 ms	40892 KB	Output is correct
68	Correct	660 ms	41524 KB	Output is correct
69	Correct	19 ms	41524 KB	Output is correct
70	Correct	124 ms	41524 KB	Output is correct
71	Correct	387 ms	41524 KB	Output is correct
72	Correct	424 ms	41524 KB	Output is correct
73	Correct	104 ms	41524 KB	Output is correct
74	Correct	557 ms	41524 KB	Output is correct
75	Correct	38 ms	41524 KB	Output is correct
76	Correct	386 ms	41524 KB	Output is correct
77	Correct	371 ms	41524 KB	Output is correct
78	Correct	42 ms	41524 KB	Output is correct
79	Correct	603 ms	41524 KB	Output is correct
80	Correct	14 ms	41524 KB	Output is correct
81	Correct	130 ms	41524 KB	Output is correct
82	Correct	453 ms	41524 KB	Output is correct
83	Correct	533 ms	41524 KB	Output is correct
84	Correct	513 ms	41524 KB	Output is correct
85	Correct	525 ms	41524 KB	Output is correct
86	Correct	532 ms	41524 KB	Output is correct
87	Correct	581 ms	41524 KB	Output is correct

답안 #79559

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