| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 79580 |
2018-10-15T03:42:04 Z |
Vinhspm |
Network (BOI15_net) |
C++14 |
|
699 ms |
45592 KB |
#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
typedef pair<int, int> ii;
const int N = 5e5 + 10;
const int oo = 1e9;
int n, cnt;
int leaf[N];
bool visit[N];
vector<int> lef, rig, vi[N];
void dfs(int pre, int u) {
for(int v: vi[u]) if(v != pre)
dfs(u, v);
if(vi[u].size() == 1) leaf[++cnt] = u;
}
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
cin >> n;
for(int i = 1; i < n; ++i) {
int u, v; cin >> u >> v;
vi[u].pb(v); vi[v].pb(u);
}
dfs(1, 1);
cout << (cnt + 1) / 2 << '\n' ;
for(int i = 1; i <= cnt / 2; ++i) cout << leaf[i] << ' ' << leaf[i + cnt / 2] << '\n' ;
if(cnt % 2 == 1) cout << leaf[cnt] << ' ' << leaf[cnt - 1] << '\n';
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12268 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12360 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12360 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 10 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 11 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 14 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 15 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 16 |
Correct |
16 ms |
12432 KB |
Output is correct |
| 17 |
Correct |
16 ms |
12432 KB |
Output is correct |
| 18 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12432 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12432 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12268 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12360 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12360 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 10 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 11 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 14 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 15 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 16 |
Correct |
16 ms |
12432 KB |
Output is correct |
| 17 |
Correct |
16 ms |
12432 KB |
Output is correct |
| 18 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12432 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 21 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 22 |
Correct |
17 ms |
12432 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12432 KB |
Output is correct |
| 25 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 26 |
Correct |
12 ms |
12444 KB |
Output is correct |
| 27 |
Correct |
14 ms |
12444 KB |
Output is correct |
| 28 |
Correct |
17 ms |
12452 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12460 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 31 |
Correct |
17 ms |
12460 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12460 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12460 KB |
Output is correct |
| 38 |
Correct |
16 ms |
12464 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 43 |
Correct |
13 ms |
12464 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 46 |
Correct |
14 ms |
12464 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12464 KB |
Output is correct |
| 50 |
Correct |
15 ms |
12464 KB |
Output is correct |
| 51 |
Correct |
15 ms |
12464 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12464 KB |
Output is correct |
| 53 |
Correct |
12 ms |
12480 KB |
Output is correct |
| 54 |
Correct |
16 ms |
12480 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12480 KB |
Output is correct |
| 56 |
Correct |
14 ms |
12480 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12480 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12480 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12268 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12360 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12360 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 10 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 11 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 14 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 15 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 16 |
Correct |
16 ms |
12432 KB |
Output is correct |
| 17 |
Correct |
16 ms |
12432 KB |
Output is correct |
| 18 |
Correct |
15 ms |
12432 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12432 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 21 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 22 |
Correct |
17 ms |
12432 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12432 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12432 KB |
Output is correct |
| 25 |
Correct |
12 ms |
12432 KB |
Output is correct |
| 26 |
Correct |
12 ms |
12444 KB |
Output is correct |
| 27 |
Correct |
14 ms |
12444 KB |
Output is correct |
| 28 |
Correct |
17 ms |
12452 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12460 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 31 |
Correct |
17 ms |
12460 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12460 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12460 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12460 KB |
Output is correct |
| 38 |
Correct |
16 ms |
12464 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 43 |
Correct |
13 ms |
12464 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 46 |
Correct |
14 ms |
12464 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12464 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12464 KB |
Output is correct |
| 50 |
Correct |
15 ms |
12464 KB |
Output is correct |
| 51 |
Correct |
15 ms |
12464 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12464 KB |
Output is correct |
| 53 |
Correct |
12 ms |
12480 KB |
Output is correct |
| 54 |
Correct |
16 ms |
12480 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12480 KB |
Output is correct |
| 56 |
Correct |
14 ms |
12480 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12480 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12480 KB |
Output is correct |
| 59 |
Correct |
391 ms |
30256 KB |
Output is correct |
| 60 |
Correct |
479 ms |
32444 KB |
Output is correct |
| 61 |
Correct |
12 ms |
32444 KB |
Output is correct |
| 62 |
Correct |
13 ms |
32444 KB |
Output is correct |
| 63 |
Correct |
384 ms |
32444 KB |
Output is correct |
| 64 |
Correct |
15 ms |
32444 KB |
Output is correct |
| 65 |
Correct |
25 ms |
32444 KB |
Output is correct |
| 66 |
Correct |
180 ms |
32444 KB |
Output is correct |
| 67 |
Correct |
563 ms |
44860 KB |
Output is correct |
| 68 |
Correct |
672 ms |
45592 KB |
Output is correct |
| 69 |
Correct |
29 ms |
45592 KB |
Output is correct |
| 70 |
Correct |
163 ms |
45592 KB |
Output is correct |
| 71 |
Correct |
365 ms |
45592 KB |
Output is correct |
| 72 |
Correct |
460 ms |
45592 KB |
Output is correct |
| 73 |
Correct |
134 ms |
45592 KB |
Output is correct |
| 74 |
Correct |
564 ms |
45592 KB |
Output is correct |
| 75 |
Correct |
43 ms |
45592 KB |
Output is correct |
| 76 |
Correct |
375 ms |
45592 KB |
Output is correct |
| 77 |
Correct |
376 ms |
45592 KB |
Output is correct |
| 78 |
Correct |
45 ms |
45592 KB |
Output is correct |
| 79 |
Correct |
699 ms |
45592 KB |
Output is correct |
| 80 |
Correct |
14 ms |
45592 KB |
Output is correct |
| 81 |
Correct |
122 ms |
45592 KB |
Output is correct |
| 82 |
Correct |
431 ms |
45592 KB |
Output is correct |
| 83 |
Correct |
514 ms |
45592 KB |
Output is correct |
| 84 |
Correct |
515 ms |
45592 KB |
Output is correct |
| 85 |
Correct |
512 ms |
45592 KB |
Output is correct |
| 86 |
Correct |
497 ms |
45592 KB |
Output is correct |
| 87 |
Correct |
554 ms |
45592 KB |
Output is correct |
