# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
503958 | 2022-01-09T09:44:56 Z | goodluck2020 | Network (BOI15_net) | C++14 | 433 ms | 47816 KB |
#include <bits/stdc++.h> #define task "BOI15_net" #define sz(X) ((int)X.size()) using namespace std; const int N = 5e5 + 5; int n; vector < int > adj[N], Leaf; vector < pair < int , int > > res; void DFS(int u, int par) { if(sz(adj[u]) == 1) Leaf.push_back(u); for(int v : adj[u]) if(v != par) DFS(v, u); } int main() { if(fopen(task ".inp","r")) { freopen(task ".inp","r",stdin); freopen(task ".out","w",stdout); } ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin >> n; for(int i = 1; i < n; i++) { int u, v; cin >> u >> v; adj[u].push_back(v); adj[v].push_back(u); } DFS(1, 0); for(int i = 0; i < (sz(Leaf) + 1)/2; i++) res.push_back({Leaf[i], Leaf[i + sz(Leaf)/2]}); cout << sz(res) << '\n'; for(auto it : res) cout << it.first << " " << it.second << '\n'; }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 9 ms | 11980 KB | Output is correct |
2 | Correct | 6 ms | 11980 KB | Output is correct |
3 | Correct | 8 ms | 12072 KB | Output is correct |
4 | Correct | 7 ms | 11980 KB | Output is correct |
5 | Correct | 7 ms | 11980 KB | Output is correct |
6 | Correct | 7 ms | 11980 KB | Output is correct |
7 | Correct | 8 ms | 11980 KB | Output is correct |
8 | Correct | 7 ms | 11980 KB | Output is correct |
9 | Correct | 7 ms | 11980 KB | Output is correct |
10 | Correct | 7 ms | 11936 KB | Output is correct |
11 | Correct | 6 ms | 11980 KB | Output is correct |
12 | Correct | 7 ms | 11980 KB | Output is correct |
13 | Correct | 7 ms | 11980 KB | Output is correct |
14 | Correct | 6 ms | 11980 KB | Output is correct |
15 | Correct | 7 ms | 11980 KB | Output is correct |
16 | Correct | 6 ms | 12024 KB | Output is correct |
17 | Correct | 8 ms | 11980 KB | Output is correct |
18 | Correct | 6 ms | 11980 KB | Output is correct |
19 | Correct | 7 ms | 11980 KB | Output is correct |
20 | Correct | 6 ms | 11988 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 9 ms | 11980 KB | Output is correct |
2 | Correct | 6 ms | 11980 KB | Output is correct |
3 | Correct | 8 ms | 12072 KB | Output is correct |
4 | Correct | 7 ms | 11980 KB | Output is correct |
5 | Correct | 7 ms | 11980 KB | Output is correct |
6 | Correct | 7 ms | 11980 KB | Output is correct |
7 | Correct | 8 ms | 11980 KB | Output is correct |
8 | Correct | 7 ms | 11980 KB | Output is correct |
9 | Correct | 7 ms | 11980 KB | Output is correct |
10 | Correct | 7 ms | 11936 KB | Output is correct |
11 | Correct | 6 ms | 11980 KB | Output is correct |
12 | Correct | 7 ms | 11980 KB | Output is correct |
13 | Correct | 7 ms | 11980 KB | Output is correct |
14 | Correct | 6 ms | 11980 KB | Output is correct |
15 | Correct | 7 ms | 11980 KB | Output is correct |
16 | Correct | 6 ms | 12024 KB | Output is correct |
17 | Correct | 8 ms | 11980 KB | Output is correct |
18 | Correct | 6 ms | 11980 KB | Output is correct |
19 | Correct | 7 ms | 11980 KB | Output is correct |
20 | Correct | 6 ms | 11988 KB | Output is correct |
21 | Correct | 7 ms | 11980 KB | Output is correct |
22 | Correct | 10 ms | 12068 KB | Output is correct |
23 | Correct | 8 ms | 12108 KB | Output is correct |
24 | Correct | 9 ms | 12108 KB | Output is correct |
25 | Correct | 7 ms | 12108 KB | Output is correct |
26 | Correct | 7 ms | 12108 KB | Output is correct |
27 | Correct | 7 ms | 12108 KB | Output is correct |
28 | Correct | 7 ms | 12108 KB | Output is correct |
29 | Correct | 7 ms | 12092 KB | Output is correct |
30 | Correct | 6 ms | 11980 KB | Output is correct |
31 | Correct | 8 ms | 12148 KB | Output is correct |
32 | Correct | 8 ms | 12108 KB | Output is correct |
33 | Correct | 7 ms | 11980 KB | Output is correct |
34 | Correct | 7 ms | 11980 KB | Output is correct |
35 | Correct | 7 ms | 11980 KB | Output is correct |
36 | Correct | 7 ms | 11980 KB | Output is correct |
37 | Correct | 7 ms | 12032 KB | Output is correct |
38 | Correct | 7 ms | 12108 KB | Output is correct |
39 | Correct | 6 ms | 11980 KB | Output is correct |
40 | Correct | 6 ms | 11980 KB | Output is correct |
41 | Correct | 6 ms | 11980 KB | Output is correct |
42 | Correct | 7 ms | 12084 KB | Output is correct |
43 | Correct | 7 ms | 12108 KB | Output is correct |
44 | Correct | 6 ms | 11980 KB | Output is correct |
45 | Correct | 7 ms | 11980 KB | Output is correct |
46 | Correct | 9 ms | 12064 KB | Output is correct |
47 | Correct | 7 ms | 11980 KB | Output is correct |
48 | Correct | 7 ms | 11980 KB | Output is correct |
49 | Correct | 8 ms | 12108 KB | Output is correct |
50 | Correct | 7 ms | 11976 KB | Output is correct |
51 | Correct | 8 ms | 11980 KB | Output is correct |
52 | Correct | 6 ms | 11980 KB | Output is correct |
53 | Correct | 7 ms | 12108 KB | Output is correct |
54 | Correct | 6 ms | 11980 KB | Output is correct |
55 | Correct | 7 ms | 11980 KB | Output is correct |
56 | Correct | 6 ms | 11980 KB | Output is correct |
57 | Correct | 9 ms | 12092 KB | Output is correct |
58 | Correct | 7 ms | 12108 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 9 ms | 11980 KB | Output is correct |
2 | Correct | 6 ms | 11980 KB | Output is correct |
3 | Correct | 8 ms | 12072 KB | Output is correct |
4 | Correct | 7 ms | 11980 KB | Output is correct |
5 | Correct | 7 ms | 11980 KB | Output is correct |
6 | Correct | 7 ms | 11980 KB | Output is correct |
7 | Correct | 8 ms | 11980 KB | Output is correct |
8 | Correct | 7 ms | 11980 KB | Output is correct |
9 | Correct | 7 ms | 11980 KB | Output is correct |
10 | Correct | 7 ms | 11936 KB | Output is correct |
11 | Correct | 6 ms | 11980 KB | Output is correct |
12 | Correct | 7 ms | 11980 KB | Output is correct |
13 | Correct | 7 ms | 11980 KB | Output is correct |
14 | Correct | 6 ms | 11980 KB | Output is correct |
15 | Correct | 7 ms | 11980 KB | Output is correct |
16 | Correct | 6 ms | 12024 KB | Output is correct |
17 | Correct | 8 ms | 11980 KB | Output is correct |
18 | Correct | 6 ms | 11980 KB | Output is correct |
19 | Correct | 7 ms | 11980 KB | Output is correct |
20 | Correct | 6 ms | 11988 KB | Output is correct |
21 | Correct | 7 ms | 11980 KB | Output is correct |
22 | Correct | 10 ms | 12068 KB | Output is correct |
23 | Correct | 8 ms | 12108 KB | Output is correct |
24 | Correct | 9 ms | 12108 KB | Output is correct |
25 | Correct | 7 ms | 12108 KB | Output is correct |
26 | Correct | 7 ms | 12108 KB | Output is correct |
27 | Correct | 7 ms | 12108 KB | Output is correct |
28 | Correct | 7 ms | 12108 KB | Output is correct |
29 | Correct | 7 ms | 12092 KB | Output is correct |
30 | Correct | 6 ms | 11980 KB | Output is correct |
31 | Correct | 8 ms | 12148 KB | Output is correct |
32 | Correct | 8 ms | 12108 KB | Output is correct |
33 | Correct | 7 ms | 11980 KB | Output is correct |
34 | Correct | 7 ms | 11980 KB | Output is correct |
35 | Correct | 7 ms | 11980 KB | Output is correct |
36 | Correct | 7 ms | 11980 KB | Output is correct |
37 | Correct | 7 ms | 12032 KB | Output is correct |
38 | Correct | 7 ms | 12108 KB | Output is correct |
39 | Correct | 6 ms | 11980 KB | Output is correct |
40 | Correct | 6 ms | 11980 KB | Output is correct |
41 | Correct | 6 ms | 11980 KB | Output is correct |
42 | Correct | 7 ms | 12084 KB | Output is correct |
43 | Correct | 7 ms | 12108 KB | Output is correct |
44 | Correct | 6 ms | 11980 KB | Output is correct |
45 | Correct | 7 ms | 11980 KB | Output is correct |
46 | Correct | 9 ms | 12064 KB | Output is correct |
47 | Correct | 7 ms | 11980 KB | Output is correct |
48 | Correct | 7 ms | 11980 KB | Output is correct |
49 | Correct | 8 ms | 12108 KB | Output is correct |
50 | Correct | 7 ms | 11976 KB | Output is correct |
51 | Correct | 8 ms | 11980 KB | Output is correct |
52 | Correct | 6 ms | 11980 KB | Output is correct |
53 | Correct | 7 ms | 12108 KB | Output is correct |
54 | Correct | 6 ms | 11980 KB | Output is correct |
55 | Correct | 7 ms | 11980 KB | Output is correct |
56 | Correct | 6 ms | 11980 KB | Output is correct |
57 | Correct | 9 ms | 12092 KB | Output is correct |
58 | Correct | 7 ms | 12108 KB | Output is correct |
59 | Correct | 301 ms | 37096 KB | Output is correct |
60 | Correct | 355 ms | 39964 KB | Output is correct |
61 | Correct | 7 ms | 11980 KB | Output is correct |
62 | Correct | 7 ms | 11980 KB | Output is correct |
63 | Correct | 265 ms | 34704 KB | Output is correct |
64 | Correct | 7 ms | 12448 KB | Output is correct |
65 | Correct | 14 ms | 13880 KB | Output is correct |
66 | Correct | 101 ms | 27788 KB | Output is correct |
67 | Correct | 433 ms | 46888 KB | Output is correct |
68 | Correct | 423 ms | 47816 KB | Output is correct |
69 | Correct | 13 ms | 13004 KB | Output is correct |
70 | Correct | 71 ms | 21824 KB | Output is correct |
71 | Correct | 274 ms | 43832 KB | Output is correct |
72 | Correct | 267 ms | 42452 KB | Output is correct |
73 | Correct | 81 ms | 19348 KB | Output is correct |
74 | Correct | 357 ms | 38604 KB | Output is correct |
75 | Correct | 24 ms | 15432 KB | Output is correct |
76 | Correct | 255 ms | 43408 KB | Output is correct |
77 | Correct | 245 ms | 43540 KB | Output is correct |
78 | Correct | 26 ms | 15304 KB | Output is correct |
79 | Correct | 384 ms | 45232 KB | Output is correct |
80 | Correct | 8 ms | 12236 KB | Output is correct |
81 | Correct | 77 ms | 21692 KB | Output is correct |
82 | Correct | 315 ms | 41008 KB | Output is correct |
83 | Correct | 359 ms | 38588 KB | Output is correct |
84 | Correct | 356 ms | 38592 KB | Output is correct |
85 | Correct | 378 ms | 38732 KB | Output is correct |
86 | Correct | 344 ms | 39992 KB | Output is correct |
87 | Correct | 399 ms | 40104 KB | Output is correct |