| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 127521 |
2019-07-09T13:38:15 Z |
miguel |
Network (BOI15_net) |
C++14 |
|
641 ms |
49712 KB |
#include<bits/stdc++.h>
using namespace std;
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define sz size()
#define x first
#define y second
#define pi pair <int, int>
#define pii pair <int, pi>
#define vi vector <int>
const ll mod = 1e9 + 7;
int n, deg[500001];
vector <int> g[500001];
vector <int> leaves;
void dfs(int cur, int p){
//if(deg[cur]==1) cout<<p<<" "<<cur<<" ";
if(deg[cur]==1) leaves.pb(cur);
for(int i: g[cur]){
if(i!=p) dfs(i, cur);
}
}
int32_t main(){
ios_base :: sync_with_stdio(0); cin.tie(); cout.tie();
cin>>n;
for(int i=1; i<=n-1; i++){
int x, y;
cin>>x>>y;
g[x].pb(y);
g[y].pb(x);
deg[x]++, deg[y]++;
}
dfs(1, 0);
int xd=(leaves.size()+1)/2;
cout<<xd<<"\n";
for(int i=0; i<xd; i++) cout<<leaves[i]<<" "<<leaves[i+leaves.size()/2]<<"\n";
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 15 |
Correct |
13 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 |
12 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12152 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 15 |
Correct |
13 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 |
12 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12368 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
14 ms |
12280 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 31 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
13 ms |
12152 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 |
13 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 41 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 43 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 49 |
Correct |
11 ms |
12280 KB |
Output is correct |
| 50 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12152 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 15 |
Correct |
13 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 |
12 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12368 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
14 ms |
12280 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 31 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
13 ms |
12152 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 |
13 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 41 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12156 KB |
Output is correct |
| 43 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 49 |
Correct |
11 ms |
12280 KB |
Output is correct |
| 50 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 59 |
Correct |
455 ms |
37944 KB |
Output is correct |
| 60 |
Correct |
546 ms |
40732 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12028 KB |
Output is correct |
| 62 |
Correct |
13 ms |
12112 KB |
Output is correct |
| 63 |
Correct |
392 ms |
35196 KB |
Output is correct |
| 64 |
Correct |
15 ms |
12556 KB |
Output is correct |
| 65 |
Correct |
26 ms |
14104 KB |
Output is correct |
| 66 |
Correct |
186 ms |
28636 KB |
Output is correct |
| 67 |
Correct |
609 ms |
48860 KB |
Output is correct |
| 68 |
Correct |
641 ms |
49712 KB |
Output is correct |
| 69 |
Correct |
20 ms |
13048 KB |
Output is correct |
| 70 |
Correct |
134 ms |
21984 KB |
Output is correct |
| 71 |
Correct |
394 ms |
43836 KB |
Output is correct |
| 72 |
Correct |
448 ms |
42668 KB |
Output is correct |
| 73 |
Correct |
112 ms |
19736 KB |
Output is correct |
| 74 |
Correct |
553 ms |
39680 KB |
Output is correct |
| 75 |
Correct |
41 ms |
15452 KB |
Output is correct |
| 76 |
Correct |
401 ms |
43520 KB |
Output is correct |
| 77 |
Correct |
396 ms |
43640 KB |
Output is correct |
| 78 |
Correct |
42 ms |
15608 KB |
Output is correct |
| 79 |
Correct |
608 ms |
47192 KB |
Output is correct |
| 80 |
Correct |
15 ms |
12320 KB |
Output is correct |
| 81 |
Correct |
150 ms |
22008 KB |
Output is correct |
| 82 |
Correct |
467 ms |
41552 KB |
Output is correct |
| 83 |
Correct |
552 ms |
39668 KB |
Output is correct |
| 84 |
Correct |
588 ms |
39636 KB |
Output is correct |
| 85 |
Correct |
527 ms |
39768 KB |
Output is correct |
| 86 |
Correct |
524 ms |
40784 KB |
Output is correct |
| 87 |
Correct |
524 ms |
40680 KB |
Output is correct |
