# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
394674 | 2021-04-27T07:21:51 Z | ali_tavakoli | Network (BOI15_net) | C++14 | 508 ms | 45300 KB |
//In The Name Of Allah #include<bits/stdc++.h> using namespace std; typedef long long ll; #define pb push_back #define F first #define S second //#pragma GCC optimize("Ofast") const int maxn = 5e5 + 5; int n, st; vector<int> adj[maxn], leaf; void dfs(int v, int p = 0) { if(adj[v].size() == 1) leaf.pb(v); for(auto u : adj[v]) if(u != p) dfs(u, v); } int main() { ios::sync_with_stdio(0);cin.tie(0);cout.tie(0); cin >> n; for(int i = 0; i < n - 1; i++) { int a, b; cin >> a >> b; adj[a].pb(b); adj[b].pb(a); } for(int i = 1; i <= n; i++) if(adj[i].size() > 1) { dfs(i); st = i; break; } cout << (leaf.size() + 1) / 2 << '\n'; int last; //cout << leaf.size() << '\n'; //return 0; for(int i = 0; i + leaf.size() / 2 < leaf.size(); i ++) { cout << leaf[i] << " " << leaf[i + leaf.size() / 2] << '\n'; last = i + leaf.size() / 2; } if(last != leaf.size() - 1) cout << leaf[leaf.size() - 1] << " " << st << '\n'; } /* 6 1 2 2 3 2 4 5 4 6 4 8 1 2 2 3 3 4 4 5 3 6 3 7 3 8 */
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 11980 KB | Output is correct |
2 | Correct | 8 ms | 11980 KB | Output is correct |
3 | Correct | 8 ms | 11980 KB | Output is correct |
4 | Correct | 8 ms | 11980 KB | Output is correct |
5 | Correct | 8 ms | 11980 KB | Output is correct |
6 | Correct | 8 ms | 11980 KB | Output is correct |
7 | Correct | 8 ms | 12056 KB | Output is correct |
8 | Correct | 8 ms | 11980 KB | Output is correct |
9 | Correct | 8 ms | 12052 KB | Output is correct |
10 | Correct | 8 ms | 11980 KB | Output is correct |
11 | Correct | 9 ms | 11980 KB | Output is correct |
12 | Correct | 8 ms | 12028 KB | Output is correct |
13 | Correct | 8 ms | 12052 KB | Output is correct |
14 | Correct | 8 ms | 12024 KB | Output is correct |
15 | Correct | 8 ms | 11980 KB | Output is correct |
16 | Correct | 8 ms | 11980 KB | Output is correct |
17 | Correct | 8 ms | 11992 KB | Output is correct |
18 | Correct | 8 ms | 11980 KB | Output is correct |
19 | Correct | 8 ms | 11980 KB | Output is correct |
20 | Correct | 8 ms | 11980 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 11980 KB | Output is correct |
2 | Correct | 8 ms | 11980 KB | Output is correct |
3 | Correct | 8 ms | 11980 KB | Output is correct |
4 | Correct | 8 ms | 11980 KB | Output is correct |
5 | Correct | 8 ms | 11980 KB | Output is correct |
6 | Correct | 8 ms | 11980 KB | Output is correct |
7 | Correct | 8 ms | 12056 KB | Output is correct |
8 | Correct | 8 ms | 11980 KB | Output is correct |
9 | Correct | 8 ms | 12052 KB | Output is correct |
10 | Correct | 8 ms | 11980 KB | Output is correct |
11 | Correct | 9 ms | 11980 KB | Output is correct |
12 | Correct | 8 ms | 12028 KB | Output is correct |
13 | Correct | 8 ms | 12052 KB | Output is correct |
14 | Correct | 8 ms | 12024 KB | Output is correct |
15 | Correct | 8 ms | 11980 KB | Output is correct |
16 | Correct | 8 ms | 11980 KB | Output is correct |
17 | Correct | 8 ms | 11992 KB | Output is correct |
18 | Correct | 8 ms | 11980 KB | Output is correct |
19 | Correct | 8 ms | 11980 KB | Output is correct |
20 | Correct | 8 ms | 11980 KB | Output is correct |
21 | Correct | 8 ms | 11980 KB | Output is correct |
22 | Correct | 10 ms | 12108 KB | Output is correct |
23 | Correct | 10 ms | 12108 KB | Output is correct |
24 | Correct | 10 ms | 12108 KB | Output is correct |
25 | Correct | 9 ms | 12108 KB | Output is correct |
26 | Correct | 8 ms | 12124 KB | Output is correct |
27 | Correct | 9 ms | 12108 KB | Output is correct |
28 | Correct | 10 ms | 12088 KB | Output is correct |
29 | Correct | 8 ms | 12108 KB | Output is correct |
30 | Correct | 8 ms | 11980 KB | Output is correct |
31 | Correct | 9 ms | 12144 KB | Output is correct |
32 | Correct | 8 ms | 12020 KB | Output is correct |
33 | Correct | 8 ms | 12052 KB | Output is correct |
34 | Correct | 9 ms | 12016 KB | Output is correct |
35 | Correct | 8 ms | 11980 KB | Output is correct |
36 | Correct | 8 ms | 11976 KB | Output is correct |
37 | Correct | 8 ms | 11980 KB | Output is correct |
38 | Correct | 8 ms | 12108 KB | Output is correct |
39 | Correct | 8 ms | 11980 KB | Output is correct |
40 | Correct | 8 ms | 11980 KB | Output is correct |
41 | Correct | 8 ms | 12056 KB | Output is correct |
42 | Correct | 8 ms | 11980 KB | Output is correct |
43 | Correct | 8 ms | 12112 KB | Output is correct |
44 | Correct | 9 ms | 12036 KB | Output is correct |
45 | Correct | 9 ms | 12064 KB | Output is correct |
46 | Correct | 8 ms | 11980 KB | Output is correct |
47 | Correct | 8 ms | 11980 KB | Output is correct |
48 | Correct | 9 ms | 11980 KB | Output is correct |
49 | Correct | 8 ms | 12108 KB | Output is correct |
50 | Correct | 8 ms | 11980 KB | Output is correct |
51 | Correct | 8 ms | 11988 KB | Output is correct |
52 | Correct | 8 ms | 11996 KB | Output is correct |
53 | Correct | 9 ms | 12108 KB | Output is correct |
54 | Correct | 8 ms | 11980 KB | Output is correct |
55 | Correct | 9 ms | 11980 KB | Output is correct |
56 | Correct | 8 ms | 11980 KB | Output is correct |
57 | Correct | 8 ms | 11980 KB | Output is correct |
58 | Correct | 9 ms | 12092 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 11980 KB | Output is correct |
2 | Correct | 8 ms | 11980 KB | Output is correct |
3 | Correct | 8 ms | 11980 KB | Output is correct |
4 | Correct | 8 ms | 11980 KB | Output is correct |
5 | Correct | 8 ms | 11980 KB | Output is correct |
6 | Correct | 8 ms | 11980 KB | Output is correct |
7 | Correct | 8 ms | 12056 KB | Output is correct |
8 | Correct | 8 ms | 11980 KB | Output is correct |
9 | Correct | 8 ms | 12052 KB | Output is correct |
10 | Correct | 8 ms | 11980 KB | Output is correct |
11 | Correct | 9 ms | 11980 KB | Output is correct |
12 | Correct | 8 ms | 12028 KB | Output is correct |
13 | Correct | 8 ms | 12052 KB | Output is correct |
14 | Correct | 8 ms | 12024 KB | Output is correct |
15 | Correct | 8 ms | 11980 KB | Output is correct |
16 | Correct | 8 ms | 11980 KB | Output is correct |
17 | Correct | 8 ms | 11992 KB | Output is correct |
18 | Correct | 8 ms | 11980 KB | Output is correct |
19 | Correct | 8 ms | 11980 KB | Output is correct |
20 | Correct | 8 ms | 11980 KB | Output is correct |
21 | Correct | 8 ms | 11980 KB | Output is correct |
22 | Correct | 10 ms | 12108 KB | Output is correct |
23 | Correct | 10 ms | 12108 KB | Output is correct |
24 | Correct | 10 ms | 12108 KB | Output is correct |
25 | Correct | 9 ms | 12108 KB | Output is correct |
26 | Correct | 8 ms | 12124 KB | Output is correct |
27 | Correct | 9 ms | 12108 KB | Output is correct |
28 | Correct | 10 ms | 12088 KB | Output is correct |
29 | Correct | 8 ms | 12108 KB | Output is correct |
30 | Correct | 8 ms | 11980 KB | Output is correct |
31 | Correct | 9 ms | 12144 KB | Output is correct |
32 | Correct | 8 ms | 12020 KB | Output is correct |
33 | Correct | 8 ms | 12052 KB | Output is correct |
34 | Correct | 9 ms | 12016 KB | Output is correct |
35 | Correct | 8 ms | 11980 KB | Output is correct |
36 | Correct | 8 ms | 11976 KB | Output is correct |
37 | Correct | 8 ms | 11980 KB | Output is correct |
38 | Correct | 8 ms | 12108 KB | Output is correct |
39 | Correct | 8 ms | 11980 KB | Output is correct |
40 | Correct | 8 ms | 11980 KB | Output is correct |
41 | Correct | 8 ms | 12056 KB | Output is correct |
42 | Correct | 8 ms | 11980 KB | Output is correct |
43 | Correct | 8 ms | 12112 KB | Output is correct |
44 | Correct | 9 ms | 12036 KB | Output is correct |
45 | Correct | 9 ms | 12064 KB | Output is correct |
46 | Correct | 8 ms | 11980 KB | Output is correct |
47 | Correct | 8 ms | 11980 KB | Output is correct |
48 | Correct | 9 ms | 11980 KB | Output is correct |
49 | Correct | 8 ms | 12108 KB | Output is correct |
50 | Correct | 8 ms | 11980 KB | Output is correct |
51 | Correct | 8 ms | 11988 KB | Output is correct |
52 | Correct | 8 ms | 11996 KB | Output is correct |
53 | Correct | 9 ms | 12108 KB | Output is correct |
54 | Correct | 8 ms | 11980 KB | Output is correct |
55 | Correct | 9 ms | 11980 KB | Output is correct |
56 | Correct | 8 ms | 11980 KB | Output is correct |
57 | Correct | 8 ms | 11980 KB | Output is correct |
58 | Correct | 9 ms | 12092 KB | Output is correct |
59 | Correct | 369 ms | 30016 KB | Output is correct |
60 | Correct | 435 ms | 32048 KB | Output is correct |
61 | Correct | 8 ms | 11980 KB | Output is correct |
62 | Correct | 8 ms | 11980 KB | Output is correct |
63 | Correct | 322 ms | 28308 KB | Output is correct |
64 | Correct | 11 ms | 12492 KB | Output is correct |
65 | Correct | 23 ms | 13956 KB | Output is correct |
66 | Correct | 156 ms | 28204 KB | Output is correct |
67 | Correct | 498 ms | 44460 KB | Output is correct |
68 | Correct | 502 ms | 45300 KB | Output is correct |
69 | Correct | 17 ms | 12808 KB | Output is correct |
70 | Correct | 91 ms | 19124 KB | Output is correct |
71 | Correct | 318 ms | 35064 KB | Output is correct |
72 | Correct | 357 ms | 34404 KB | Output is correct |
73 | Correct | 91 ms | 17348 KB | Output is correct |
74 | Correct | 445 ms | 31088 KB | Output is correct |
75 | Correct | 32 ms | 14576 KB | Output is correct |
76 | Correct | 386 ms | 34848 KB | Output is correct |
77 | Correct | 330 ms | 35104 KB | Output is correct |
78 | Correct | 36 ms | 15180 KB | Output is correct |
79 | Correct | 508 ms | 42068 KB | Output is correct |
80 | Correct | 10 ms | 12236 KB | Output is correct |
81 | Correct | 108 ms | 19204 KB | Output is correct |
82 | Correct | 409 ms | 33176 KB | Output is correct |
83 | Correct | 469 ms | 31032 KB | Output is correct |
84 | Correct | 461 ms | 31052 KB | Output is correct |
85 | Correct | 465 ms | 31224 KB | Output is correct |
86 | Correct | 498 ms | 32116 KB | Output is correct |
87 | Correct | 433 ms | 32256 KB | Output is correct |