| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 394601 |
2021-04-27T05:41:38 Z |
Nima_Naderi |
Network (BOI15_net) |
C++14 |
|
496 ms |
55108 KB |
//In the name of GOD
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll MXN = 5e5 + 10;
ll n, rt, lf;
ll d[MXN];
vector<ll> adj[MXN], L;
void dfs(ll u, ll par){
if(d[u] == 1){
L.push_back(u), lf ++;
}
for(auto v : adj[u]){
if(v != par) dfs(v, u);
}
}
int main(){
ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
cin >> n;
for(int i = 1; i < n; i ++){
ll u, v; cin >> u >> v; d[u] ++, d[v] ++;
adj[u].push_back(v), adj[v].push_back(u);
}
for(int i = 1; i <= n; i ++) if(d[i] > 1) rt = i;
dfs(rt, 0);
cout << (lf + 1) / 2 << '\n';
for(int i = 0; i < lf - lf / 2; i ++){
cout << L[i] << ' ' << L[i + lf / 2] << '\n';
}
return 0;
}
// N.N_2004
// THIS IS THE PAYOFF
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11956 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 8 |
Correct |
7 ms |
11972 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11984 KB |
Output is correct |
| 11 |
Correct |
7 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 |
7 ms |
12064 KB |
Output is correct |
| 15 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 16 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11980 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11956 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 8 |
Correct |
7 ms |
11972 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11984 KB |
Output is correct |
| 11 |
Correct |
7 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 |
7 ms |
12064 KB |
Output is correct |
| 15 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 16 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12176 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12100 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12088 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12044 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11956 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12004 KB |
Output is correct |
| 38 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 41 |
Correct |
8 ms |
12016 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12112 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12108 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11956 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 8 |
Correct |
7 ms |
11972 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11984 KB |
Output is correct |
| 11 |
Correct |
7 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 |
7 ms |
12064 KB |
Output is correct |
| 15 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 16 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12176 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12100 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12088 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12044 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11956 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12004 KB |
Output is correct |
| 38 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 41 |
Correct |
8 ms |
12016 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12112 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 59 |
Correct |
371 ms |
38192 KB |
Output is correct |
| 60 |
Correct |
438 ms |
40948 KB |
Output is correct |
| 61 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 62 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 63 |
Correct |
354 ms |
34868 KB |
Output is correct |
| 64 |
Correct |
9 ms |
12364 KB |
Output is correct |
| 65 |
Correct |
17 ms |
13752 KB |
Output is correct |
| 66 |
Correct |
129 ms |
24436 KB |
Output is correct |
| 67 |
Correct |
490 ms |
55108 KB |
Output is correct |
| 68 |
Correct |
490 ms |
48820 KB |
Output is correct |
| 69 |
Correct |
15 ms |
13008 KB |
Output is correct |
| 70 |
Correct |
88 ms |
22592 KB |
Output is correct |
| 71 |
Correct |
341 ms |
43060 KB |
Output is correct |
| 72 |
Correct |
330 ms |
42012 KB |
Output is correct |
| 73 |
Correct |
90 ms |
19516 KB |
Output is correct |
| 74 |
Correct |
454 ms |
38576 KB |
Output is correct |
| 75 |
Correct |
31 ms |
15504 KB |
Output is correct |
| 76 |
Correct |
320 ms |
42592 KB |
Output is correct |
| 77 |
Correct |
319 ms |
43124 KB |
Output is correct |
| 78 |
Correct |
32 ms |
15428 KB |
Output is correct |
| 79 |
Correct |
496 ms |
42436 KB |
Output is correct |
| 80 |
Correct |
9 ms |
12332 KB |
Output is correct |
| 81 |
Correct |
120 ms |
21832 KB |
Output is correct |
| 82 |
Correct |
404 ms |
40764 KB |
Output is correct |
| 83 |
Correct |
489 ms |
38576 KB |
Output is correct |
| 84 |
Correct |
449 ms |
38520 KB |
Output is correct |
| 85 |
Correct |
447 ms |
38532 KB |
Output is correct |
| 86 |
Correct |
441 ms |
40868 KB |
Output is correct |
| 87 |
Correct |
446 ms |
40752 KB |
Output is correct |
