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답안 #653417

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
653417 2022-10-26T19:34:18 Z pauloamed Network (BOI15_net) C++14
100 / 100
 653 ms 51836 KB 
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 500010;

vector<int> v[MAXN];

vector<int> fol;
void solve(int x, int p){
  bool folha = (v[x].size() == 1);
  for(auto y : v[x]) if(y != p){
    solve(y, x);
  }
  if(folha) fol.push_back(x);
}

int main(){
  int n; cin >> n;
  for(int i = 0; i + 1 < n; ++i){
    int a, b; cin >> a >> b;
    a--; b--;
    v[a].push_back(b);
    v[b].push_back(a);
  }

  solve(0, -1);

  int m = fol.size();
  int mid = (m + 1) / 2;

  cout << mid << "\n";
  for(int i = 0; i < mid; ++i){
    cout << fol[i] + 1 << " " << fol[min(i + mid, m - 1)] + 1 << "\n";
  }

}

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12040 KB Output is correct
2 Correct 13 ms 12028 KB Output is correct
3 Correct 9 ms 11988 KB Output is correct
4 Correct 10 ms 12044 KB Output is correct
5 Correct 8 ms 11988 KB Output is correct
6 Correct 9 ms 11988 KB Output is correct
7 Correct 9 ms 11988 KB Output is correct
8 Correct 8 ms 11988 KB Output is correct
9 Correct 12 ms 11940 KB Output is correct
10 Correct 10 ms 11988 KB Output is correct
11 Correct 10 ms 12012 KB Output is correct
12 Correct 8 ms 12020 KB Output is correct
13 Correct 8 ms 11988 KB Output is correct
14 Correct 8 ms 11988 KB Output is correct
15 Correct 9 ms 11988 KB Output is correct
16 Correct 9 ms 11988 KB Output is correct
17 Correct 10 ms 11988 KB Output is correct
18 Correct 8 ms 11988 KB Output is correct
19 Correct 9 ms 11988 KB Output is correct
20 Correct 9 ms 11988 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12040 KB Output is correct
2 Correct 13 ms 12028 KB Output is correct
3 Correct 9 ms 11988 KB Output is correct
4 Correct 10 ms 12044 KB Output is correct
5 Correct 8 ms 11988 KB Output is correct
6 Correct 9 ms 11988 KB Output is correct
7 Correct 9 ms 11988 KB Output is correct
8 Correct 8 ms 11988 KB Output is correct
9 Correct 12 ms 11940 KB Output is correct
10 Correct 10 ms 11988 KB Output is correct
11 Correct 10 ms 12012 KB Output is correct
12 Correct 8 ms 12020 KB Output is correct
13 Correct 8 ms 11988 KB Output is correct
14 Correct 8 ms 11988 KB Output is correct
15 Correct 9 ms 11988 KB Output is correct
16 Correct 9 ms 11988 KB Output is correct
17 Correct 10 ms 11988 KB Output is correct
18 Correct 8 ms 11988 KB Output is correct
19 Correct 9 ms 11988 KB Output is correct
20 Correct 9 ms 11988 KB Output is correct
21 Correct 9 ms 11988 KB Output is correct
22 Correct 13 ms 12024 KB Output is correct
23 Correct 10 ms 12116 KB Output is correct
24 Correct 8 ms 12116 KB Output is correct
25 Correct 7 ms 12116 KB Output is correct
26 Correct 8 ms 12052 KB Output is correct
27 Correct 9 ms 12116 KB Output is correct
28 Correct 8 ms 12116 KB Output is correct
29 Correct 8 ms 12088 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 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 6 ms 11960 KB Output is correct
36 Correct 7 ms 11988 KB Output is correct
37 Correct 8 ms 11988 KB Output is correct
38 Correct 7 ms 12116 KB Output is correct
39 Correct 8 ms 11988 KB Output is correct
40 Correct 7 ms 11988 KB Output is correct
41 Correct 7 ms 11988 KB Output is correct
42 Correct 7 ms 11988 KB Output is correct
43 Correct 7 ms 11988 KB Output is correct
44 Correct 6 ms 12032 KB Output is correct
45 Correct 7 ms 12084 KB Output is correct
46 Correct 9 ms 11988 KB Output is correct
47 Correct 7 ms 11988 KB Output is correct
48 Correct 7 ms 12012 KB Output is correct
49 Correct 8 ms 11988 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 8 ms 11988 KB Output is correct
52 Correct 7 ms 11988 KB Output is correct
53 Correct 7 ms 11988 KB Output is correct
54 Correct 7 ms 11948 KB Output is correct
55 Correct 7 ms 11988 KB Output is correct
56 Correct 8 ms 11988 KB Output is correct
57 Correct 8 ms 11988 KB Output is correct
58 Correct 10 ms 12136 KB Output is correct

Subtask #3
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12040 KB Output is correct
2 Correct 13 ms 12028 KB Output is correct
3 Correct 9 ms 11988 KB Output is correct
4 Correct 10 ms 12044 KB Output is correct
5 Correct 8 ms 11988 KB Output is correct
6 Correct 9 ms 11988 KB Output is correct
7 Correct 9 ms 11988 KB Output is correct
8 Correct 8 ms 11988 KB Output is correct
9 Correct 12 ms 11940 KB Output is correct
10 Correct 10 ms 11988 KB Output is correct
11 Correct 10 ms 12012 KB Output is correct
12 Correct 8 ms 12020 KB Output is correct
13 Correct 8 ms 11988 KB Output is correct
14 Correct 8 ms 11988 KB Output is correct
15 Correct 9 ms 11988 KB Output is correct
16 Correct 9 ms 11988 KB Output is correct
17 Correct 10 ms 11988 KB Output is correct
18 Correct 8 ms 11988 KB Output is correct
19 Correct 9 ms 11988 KB Output is correct
20 Correct 9 ms 11988 KB Output is correct
21 Correct 9 ms 11988 KB Output is correct
22 Correct 13 ms 12024 KB Output is correct
23 Correct 10 ms 12116 KB Output is correct
24 Correct 8 ms 12116 KB Output is correct
25 Correct 7 ms 12116 KB Output is correct
26 Correct 8 ms 12052 KB Output is correct
27 Correct 9 ms 12116 KB Output is correct
28 Correct 8 ms 12116 KB Output is correct
29 Correct 8 ms 12088 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 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 6 ms 11960 KB Output is correct
36 Correct 7 ms 11988 KB Output is correct
37 Correct 8 ms 11988 KB Output is correct
38 Correct 7 ms 12116 KB Output is correct
39 Correct 8 ms 11988 KB Output is correct
40 Correct 7 ms 11988 KB Output is correct
41 Correct 7 ms 11988 KB Output is correct
42 Correct 7 ms 11988 KB Output is correct
43 Correct 7 ms 11988 KB Output is correct
44 Correct 6 ms 12032 KB Output is correct
45 Correct 7 ms 12084 KB Output is correct
46 Correct 9 ms 11988 KB Output is correct
47 Correct 7 ms 11988 KB Output is correct
48 Correct 7 ms 12012 KB Output is correct
49 Correct 8 ms 11988 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 8 ms 11988 KB Output is correct
52 Correct 7 ms 11988 KB Output is correct
53 Correct 7 ms 11988 KB Output is correct
54 Correct 7 ms 11948 KB Output is correct
55 Correct 7 ms 11988 KB Output is correct
56 Correct 8 ms 11988 KB Output is correct
57 Correct 8 ms 11988 KB Output is correct
58 Correct 10 ms 12136 KB Output is correct
59 Correct 586 ms 30052 KB Output is correct
60 Correct 602 ms 38712 KB Output is correct
61 Correct 8 ms 12048 KB Output is correct
62 Correct 7 ms 11952 KB Output is correct
63 Correct 463 ms 33600 KB Output is correct
64 Correct 12 ms 12500 KB Output is correct
65 Correct 32 ms 14100 KB Output is correct
66 Correct 198 ms 30472 KB Output is correct
67 Correct 623 ms 51112 KB Output is correct
68 Correct 643 ms 51836 KB Output is correct
69 Correct 19 ms 12824 KB Output is correct
70 Correct 144 ms 21248 KB Output is correct
71 Correct 502 ms 41908 KB Output is correct
72 Correct 504 ms 40684 KB Output is correct
73 Correct 156 ms 19012 KB Output is correct
74 Correct 591 ms 37760 KB Output is correct
75 Correct 48 ms 15160 KB Output is correct
76 Correct 495 ms 41456 KB Output is correct
77 Correct 528 ms 41516 KB Output is correct
78 Correct 47 ms 15564 KB Output is correct
79 Correct 653 ms 48748 KB Output is correct
80 Correct 11 ms 12188 KB Output is correct
81 Correct 155 ms 21176 KB Output is correct
82 Correct 519 ms 39524 KB Output is correct
83 Correct 593 ms 37600 KB Output is correct
84 Correct 617 ms 37564 KB Output is correct
85 Correct 584 ms 37604 KB Output is correct
86 Correct 607 ms 38784 KB Output is correct
87 Correct 586 ms 38868 KB Output is correct