# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
666806 | 2022-11-29T18:23:11 Z | divad | Network (BOI15_net) | C++14 | 625 ms | 49668 KB |
#include <iostream> #include <algorithm> #include <vector> #define MAX 500002 using namespace std; int n,x,y,vf[MAX]; vector<int> v[MAX],frunze; void dfs(int nod){ vf[nod] = 1; bool ok = false; for(auto vecin: v[nod]){ if(vf[vecin] == 0){ ok |= true; dfs(vecin); } } if(!ok){ frunze.push_back(nod); } } int main() { cin >> n; for(int i = 1; i < n; i++){ cin >> x >> y; v[x].push_back(y); v[y].push_back(x); } int rad = 1; for(int i = 1; i <= n; i++){ if(v[i].size() > 1){ rad = i; break; } } dfs(rad); if(frunze.size()%2 == 0){ cout << frunze.size()/2 << "\n"; for(int i = 0; i < frunze.size()/2; i++){ cout << frunze[i] << " " << frunze[i + frunze.size()/2] << "\n"; } }else{ cout << (frunze.size()/2)+1 << "\n"; for(int i = 0; i < frunze.size()/2; i++){ cout << frunze[i] << " " << frunze[i + frunze.size()/2 + 1] << "\n"; } cout << rad << " " << frunze[frunze.size()/2]; } return 0; }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 6 ms | 11988 KB | Output is correct |
2 | Correct | 6 ms | 11988 KB | Output is correct |
3 | Correct | 6 ms | 11988 KB | Output is correct |
4 | Correct | 6 ms | 11988 KB | Output is correct |
5 | Correct | 7 ms | 11988 KB | Output is correct |
6 | Correct | 7 ms | 11988 KB | Output is correct |
7 | Correct | 6 ms | 11956 KB | Output is correct |
8 | Correct | 7 ms | 12016 KB | Output is correct |
9 | Correct | 6 ms | 11988 KB | Output is correct |
10 | Correct | 6 ms | 12052 KB | Output is correct |
11 | Correct | 6 ms | 11960 KB | Output is correct |
12 | Correct | 7 ms | 12036 KB | Output is correct |
13 | Correct | 6 ms | 11988 KB | Output is correct |
14 | Correct | 6 ms | 11988 KB | Output is correct |
15 | Correct | 7 ms | 11988 KB | Output is correct |
16 | Correct | 6 ms | 12056 KB | Output is correct |
17 | Correct | 6 ms | 12048 KB | Output is correct |
18 | Correct | 7 ms | 12052 KB | Output is correct |
19 | Correct | 7 ms | 11988 KB | Output is correct |
20 | Correct | 7 ms | 11988 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 6 ms | 11988 KB | Output is correct |
2 | Correct | 6 ms | 11988 KB | Output is correct |
3 | Correct | 6 ms | 11988 KB | Output is correct |
4 | Correct | 6 ms | 11988 KB | Output is correct |
5 | Correct | 7 ms | 11988 KB | Output is correct |
6 | Correct | 7 ms | 11988 KB | Output is correct |
7 | Correct | 6 ms | 11956 KB | Output is correct |
8 | Correct | 7 ms | 12016 KB | Output is correct |
9 | Correct | 6 ms | 11988 KB | Output is correct |
10 | Correct | 6 ms | 12052 KB | Output is correct |
11 | Correct | 6 ms | 11960 KB | Output is correct |
12 | Correct | 7 ms | 12036 KB | Output is correct |
13 | Correct | 6 ms | 11988 KB | Output is correct |
14 | Correct | 6 ms | 11988 KB | Output is correct |
15 | Correct | 7 ms | 11988 KB | Output is correct |
16 | Correct | 6 ms | 12056 KB | Output is correct |
17 | Correct | 6 ms | 12048 KB | Output is correct |
18 | Correct | 7 ms | 12052 KB | Output is correct |
19 | Correct | 7 ms | 11988 KB | Output is correct |
20 | Correct | 7 ms | 11988 KB | Output is correct |
21 | Correct | 6 ms | 11988 KB | Output is correct |
22 | Correct | 8 ms | 12116 KB | Output is correct |
23 | Correct | 8 ms | 12116 KB | Output is correct |
24 | Correct | 8 ms | 12144 KB | Output is correct |
25 | Correct | 8 ms | 12064 KB | Output is correct |
26 | Correct | 7 ms | 12116 KB | Output is correct |
27 | Correct | 8 ms | 12116 KB | Output is correct |
28 | Correct | 8 ms | 12064 KB | Output is correct |
29 | Correct | 8 ms | 12132 KB | Output is correct |
30 | Correct | 7 ms | 11988 KB | Output is correct |
31 | Correct | 8 ms | 12116 KB | Output is correct |
32 | Correct | 6 ms | 11988 KB | Output is correct |
33 | Correct | 7 ms | 11988 KB | Output is correct |
34 | Correct | 6 ms | 11988 KB | Output is correct |
35 | Correct | 7 ms | 11988 KB | Output is correct |
36 | Correct | 7 ms | 11988 KB | Output is correct |
37 | Correct | 7 ms | 11988 KB | Output is correct |
38 | Correct | 7 ms | 12064 KB | Output is correct |
39 | Correct | 7 ms | 11988 KB | Output is correct |
40 | Correct | 7 ms | 12048 KB | Output is correct |
41 | Correct | 7 ms | 11960 KB | Output is correct |
42 | Correct | 9 ms | 11964 KB | Output is correct |
43 | Correct | 8 ms | 12104 KB | Output is correct |
44 | Correct | 6 ms | 11988 KB | Output is correct |
45 | Correct | 7 ms | 12048 KB | Output is correct |
46 | Correct | 7 ms | 12060 KB | Output is correct |
47 | Correct | 6 ms | 11988 KB | Output is correct |
48 | Correct | 7 ms | 12116 KB | Output is correct |
49 | Correct | 7 ms | 12116 KB | Output is correct |
50 | Correct | 7 ms | 11988 KB | Output is correct |
51 | Correct | 7 ms | 11988 KB | Output is correct |
52 | Correct | 7 ms | 11988 KB | Output is correct |
53 | Correct | 9 ms | 12080 KB | Output is correct |
54 | Correct | 7 ms | 12016 KB | Output is correct |
55 | Correct | 7 ms | 12052 KB | Output is correct |
56 | Correct | 6 ms | 12052 KB | Output is correct |
57 | Correct | 7 ms | 11988 KB | Output is correct |
58 | Correct | 8 ms | 12116 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 6 ms | 11988 KB | Output is correct |
2 | Correct | 6 ms | 11988 KB | Output is correct |
3 | Correct | 6 ms | 11988 KB | Output is correct |
4 | Correct | 6 ms | 11988 KB | Output is correct |
5 | Correct | 7 ms | 11988 KB | Output is correct |
6 | Correct | 7 ms | 11988 KB | Output is correct |
7 | Correct | 6 ms | 11956 KB | Output is correct |
8 | Correct | 7 ms | 12016 KB | Output is correct |
9 | Correct | 6 ms | 11988 KB | Output is correct |
10 | Correct | 6 ms | 12052 KB | Output is correct |
11 | Correct | 6 ms | 11960 KB | Output is correct |
12 | Correct | 7 ms | 12036 KB | Output is correct |
13 | Correct | 6 ms | 11988 KB | Output is correct |
14 | Correct | 6 ms | 11988 KB | Output is correct |
15 | Correct | 7 ms | 11988 KB | Output is correct |
16 | Correct | 6 ms | 12056 KB | Output is correct |
17 | Correct | 6 ms | 12048 KB | Output is correct |
18 | Correct | 7 ms | 12052 KB | Output is correct |
19 | Correct | 7 ms | 11988 KB | Output is correct |
20 | Correct | 7 ms | 11988 KB | Output is correct |
21 | Correct | 6 ms | 11988 KB | Output is correct |
22 | Correct | 8 ms | 12116 KB | Output is correct |
23 | Correct | 8 ms | 12116 KB | Output is correct |
24 | Correct | 8 ms | 12144 KB | Output is correct |
25 | Correct | 8 ms | 12064 KB | Output is correct |
26 | Correct | 7 ms | 12116 KB | Output is correct |
27 | Correct | 8 ms | 12116 KB | Output is correct |
28 | Correct | 8 ms | 12064 KB | Output is correct |
29 | Correct | 8 ms | 12132 KB | Output is correct |
30 | Correct | 7 ms | 11988 KB | Output is correct |
31 | Correct | 8 ms | 12116 KB | Output is correct |
32 | Correct | 6 ms | 11988 KB | Output is correct |
33 | Correct | 7 ms | 11988 KB | Output is correct |
34 | Correct | 6 ms | 11988 KB | Output is correct |
35 | Correct | 7 ms | 11988 KB | Output is correct |
36 | Correct | 7 ms | 11988 KB | Output is correct |
37 | Correct | 7 ms | 11988 KB | Output is correct |
38 | Correct | 7 ms | 12064 KB | Output is correct |
39 | Correct | 7 ms | 11988 KB | Output is correct |
40 | Correct | 7 ms | 12048 KB | Output is correct |
41 | Correct | 7 ms | 11960 KB | Output is correct |
42 | Correct | 9 ms | 11964 KB | Output is correct |
43 | Correct | 8 ms | 12104 KB | Output is correct |
44 | Correct | 6 ms | 11988 KB | Output is correct |
45 | Correct | 7 ms | 12048 KB | Output is correct |
46 | Correct | 7 ms | 12060 KB | Output is correct |
47 | Correct | 6 ms | 11988 KB | Output is correct |
48 | Correct | 7 ms | 12116 KB | Output is correct |
49 | Correct | 7 ms | 12116 KB | Output is correct |
50 | Correct | 7 ms | 11988 KB | Output is correct |
51 | Correct | 7 ms | 11988 KB | Output is correct |
52 | Correct | 7 ms | 11988 KB | Output is correct |
53 | Correct | 9 ms | 12080 KB | Output is correct |
54 | Correct | 7 ms | 12016 KB | Output is correct |
55 | Correct | 7 ms | 12052 KB | Output is correct |
56 | Correct | 6 ms | 12052 KB | Output is correct |
57 | Correct | 7 ms | 11988 KB | Output is correct |
58 | Correct | 8 ms | 12116 KB | Output is correct |
59 | Correct | 467 ms | 37680 KB | Output is correct |
60 | Correct | 566 ms | 40644 KB | Output is correct |
61 | Correct | 7 ms | 11988 KB | Output is correct |
62 | Correct | 8 ms | 11988 KB | Output is correct |
63 | Correct | 422 ms | 35092 KB | Output is correct |
64 | Correct | 10 ms | 12532 KB | Output is correct |
65 | Correct | 24 ms | 13924 KB | Output is correct |
66 | Correct | 188 ms | 28592 KB | Output is correct |
67 | Correct | 625 ms | 48984 KB | Output is correct |
68 | Correct | 621 ms | 49668 KB | Output is correct |
69 | Correct | 22 ms | 12896 KB | Output is correct |
70 | Correct | 150 ms | 21892 KB | Output is correct |
71 | Correct | 494 ms | 43804 KB | Output is correct |
72 | Correct | 493 ms | 42604 KB | Output is correct |
73 | Correct | 153 ms | 19520 KB | Output is correct |
74 | Correct | 597 ms | 39516 KB | Output is correct |
75 | Correct | 47 ms | 15436 KB | Output is correct |
76 | Correct | 473 ms | 43408 KB | Output is correct |
77 | Correct | 444 ms | 43508 KB | Output is correct |
78 | Correct | 48 ms | 15744 KB | Output is correct |
79 | Correct | 608 ms | 46988 KB | Output is correct |
80 | Correct | 9 ms | 12244 KB | Output is correct |
81 | Correct | 156 ms | 21932 KB | Output is correct |
82 | Correct | 503 ms | 41588 KB | Output is correct |
83 | Correct | 558 ms | 39624 KB | Output is correct |
84 | Correct | 555 ms | 39544 KB | Output is correct |
85 | Correct | 575 ms | 39708 KB | Output is correct |
86 | Correct | 581 ms | 40728 KB | Output is correct |
87 | Correct | 552 ms | 40720 KB | Output is correct |