| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 91780 |
2018-12-30T02:41:05 Z |
ngot23 |
Network (BOI15_net) |
C++11 |
|
727 ms |
49956 KB |
#include <bits/stdc++.h>
#define rep(i, a, b) for(int i=(a) ; i<=(b) ; ++i)
#define mp make_pair
#define PB push_back
#define pii pair<int,int>
#define F first
#define S second
#define Task "net"
using namespace std;
const int N=500005;
int n, leaf[N], dem, cnt, s[N], deg[N], root;
vector <int > g[N];
vector <pii > ans;
void setup() {
cin >> n;
rep(i, 2, n) {
int u, v; cin >> u >> v;
g[u].PB(v); g[v].PB(u);
++deg[u]; ++deg[v];
}
}
void DFS(int u, int prv) {
bool check=1;
for(int v:g[u]) {
if(v==prv) continue;
check=0;
DFS(v, u);
}
if(check) leaf[++dem]=u;
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen(Task".inp", "r", stdin);
//freopen(Task".out", "w", stdout);
setup();
rep(i, 1, n) {
if(deg[i]>1) { root=i; break; }
}
DFS(root, 0);
rep(i, 1, dem) {
s[++cnt]=leaf[i];
if(cnt>2) {
ans.PB(mp(s[cnt-2], s[cnt]));
s[cnt-2]=s[cnt-1];
cnt-=2;
}
}
if(cnt==2) ans.PB(mp(s[1], s[2]));
else ans.PB(mp(s[1], root));
cout << ans.size() << '\n';
for(auto P:ans) {
cout << P.F << ' ' << P.S << '\n';
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12132 KB |
Output is correct |
| 5 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 13 |
Correct |
11 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 19 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 20 |
Correct |
11 ms |
12024 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12132 KB |
Output is correct |
| 5 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 13 |
Correct |
11 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 19 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 20 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 22 |
Correct |
11 ms |
12280 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12272 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12324 KB |
Output is correct |
| 27 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 28 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 31 |
Correct |
14 ms |
12272 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
13 ms |
12136 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 46 |
Correct |
12 ms |
12196 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 48 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 49 |
Correct |
12 ms |
12188 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 53 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 57 |
Correct |
12 ms |
12100 KB |
Output is correct |
| 58 |
Correct |
12 ms |
12280 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12132 KB |
Output is correct |
| 5 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 13 |
Correct |
11 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 19 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 20 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 22 |
Correct |
11 ms |
12280 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12272 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12324 KB |
Output is correct |
| 27 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 28 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 31 |
Correct |
14 ms |
12272 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
13 ms |
12136 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 46 |
Correct |
12 ms |
12196 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 48 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 49 |
Correct |
12 ms |
12188 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 53 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 57 |
Correct |
12 ms |
12100 KB |
Output is correct |
| 58 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 59 |
Correct |
484 ms |
39016 KB |
Output is correct |
| 60 |
Correct |
557 ms |
42028 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 62 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 63 |
Correct |
423 ms |
36400 KB |
Output is correct |
| 64 |
Correct |
14 ms |
12536 KB |
Output is correct |
| 65 |
Correct |
23 ms |
14072 KB |
Output is correct |
| 66 |
Correct |
214 ms |
28664 KB |
Output is correct |
| 67 |
Correct |
674 ms |
49100 KB |
Output is correct |
| 68 |
Correct |
727 ms |
49956 KB |
Output is correct |
| 69 |
Correct |
19 ms |
13096 KB |
Output is correct |
| 70 |
Correct |
120 ms |
22476 KB |
Output is correct |
| 71 |
Correct |
410 ms |
45812 KB |
Output is correct |
| 72 |
Correct |
432 ms |
44360 KB |
Output is correct |
| 73 |
Correct |
130 ms |
19956 KB |
Output is correct |
| 74 |
Correct |
624 ms |
40692 KB |
Output is correct |
| 75 |
Correct |
43 ms |
15736 KB |
Output is correct |
| 76 |
Correct |
438 ms |
45456 KB |
Output is correct |
| 77 |
Correct |
430 ms |
45520 KB |
Output is correct |
| 78 |
Correct |
56 ms |
15864 KB |
Output is correct |
| 79 |
Correct |
683 ms |
47348 KB |
Output is correct |
| 80 |
Correct |
12 ms |
12408 KB |
Output is correct |
| 81 |
Correct |
100 ms |
22520 KB |
Output is correct |
| 82 |
Correct |
654 ms |
43116 KB |
Output is correct |
| 83 |
Correct |
427 ms |
40684 KB |
Output is correct |
| 84 |
Correct |
482 ms |
40684 KB |
Output is correct |
| 85 |
Correct |
467 ms |
40684 KB |
Output is correct |
| 86 |
Correct |
593 ms |
42176 KB |
Output is correct |
| 87 |
Correct |
591 ms |
42216 KB |
Output is correct |
