| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 397314 |
2021-05-01T21:48:16 Z |
Bitmasking |
Network (BOI15_net) |
C++14 |
|
452 ms |
52880 KB |
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define f(i,a,b) for( ll i = a; i < b ; i++ )
#define af(i,a,b) for( ll i = a; i >= b ; i--)
#define rep(i,a,b,k) for(ll i = a; i < b ; i+= k )
#define arep(i,a,b,k) for( ll i = a; i >= b ; i-= k)
#define ones(ini) (ll) __builtin_popcountll(x)
#define todo(y,val) all_of(all(y),[&val](ll x) {return (x == ((ll)val));})
#define nada(y,val) none_of(all(y),[&val](ll x) {return (x == ((ll)val));})
#define algu(y,val) any_of(all(y),[&val](ll x) {return (x == ((ll)val));})
#define cuantos(a,x) count(all(a),x)
#define fs first
#define sc second
#define pb push_back
#define po pop_back
#define sz(a) (ll) a.size()
#define all(a) a.begin(), a.end()
#define sor(a) sort( a.begin(), a.end() )
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ller ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr)
#define watch(x) cout << (#x) << " is " << (x) <<"\n"
#define test ll deftestcases;cin>>deftestcases;while(deftestcases--)
#define PI acos(-1)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
template<class T> using ordered_set =tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update> ;
const ll inf = 2e9;
const ll mod = 1e9+7;
const ll MAX = 5e5+10;
vi adj[MAX];
vi hojas;
void dfs(ll u,ll par){
for(auto v : adj[u]){
if(v!=par) dfs(v,u);
}
if(sz(adj[u])==1) hojas.pb(u);
}
int main(){
fastio;
ll n;cin>>n;
f(i,0,n-1){
ll u,v;
cin>>u>>v;
adj[u].pb(v);
adj[v].pb(u);
}
dfs(1,0);
n = sz(hojas);
cout<<(n + n%2)/2<<"\n";
f(i,0,n/2) cout<<hojas[i]<<" "<<hojas[n/2+i]<<"\n";
if(n&1) cout<<hojas[0]<<" "<<hojas[n-1]<<"\n";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
7 ms |
11980 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 |
12060 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 12 |
Correct |
7 ms |
12004 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12060 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 |
12060 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11980 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
7 ms |
11980 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 |
12060 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 12 |
Correct |
7 ms |
12004 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12060 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 |
12060 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12196 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12184 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12072 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 32 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12028 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 40 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 42 |
Correct |
8 ms |
12080 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 49 |
Correct |
8 ms |
12068 KB |
Output is correct |
| 50 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 51 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 52 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
8 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 |
8 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12200 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
7 ms |
11980 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 |
12060 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 12 |
Correct |
7 ms |
12004 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12060 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 |
12060 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12196 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12184 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12072 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 32 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12028 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 40 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 42 |
Correct |
8 ms |
12080 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 49 |
Correct |
8 ms |
12068 KB |
Output is correct |
| 50 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 51 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 52 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
8 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 |
8 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12200 KB |
Output is correct |
| 59 |
Correct |
339 ms |
40616 KB |
Output is correct |
| 60 |
Correct |
417 ms |
43376 KB |
Output is correct |
| 61 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 62 |
Correct |
7 ms |
11992 KB |
Output is correct |
| 63 |
Correct |
300 ms |
36616 KB |
Output is correct |
| 64 |
Correct |
9 ms |
12492 KB |
Output is correct |
| 65 |
Correct |
18 ms |
14176 KB |
Output is correct |
| 66 |
Correct |
136 ms |
30532 KB |
Output is correct |
| 67 |
Correct |
451 ms |
51084 KB |
Output is correct |
| 68 |
Correct |
452 ms |
52880 KB |
Output is correct |
| 69 |
Correct |
13 ms |
13004 KB |
Output is correct |
| 70 |
Correct |
83 ms |
23268 KB |
Output is correct |
| 71 |
Correct |
294 ms |
45792 KB |
Output is correct |
| 72 |
Correct |
313 ms |
44320 KB |
Output is correct |
| 73 |
Correct |
85 ms |
20016 KB |
Output is correct |
| 74 |
Correct |
418 ms |
41136 KB |
Output is correct |
| 75 |
Correct |
32 ms |
15796 KB |
Output is correct |
| 76 |
Correct |
302 ms |
45364 KB |
Output is correct |
| 77 |
Correct |
296 ms |
45448 KB |
Output is correct |
| 78 |
Correct |
32 ms |
15808 KB |
Output is correct |
| 79 |
Correct |
448 ms |
48748 KB |
Output is correct |
| 80 |
Correct |
9 ms |
12236 KB |
Output is correct |
| 81 |
Correct |
102 ms |
22468 KB |
Output is correct |
| 82 |
Correct |
369 ms |
43248 KB |
Output is correct |
| 83 |
Correct |
432 ms |
41132 KB |
Output is correct |
| 84 |
Correct |
429 ms |
41264 KB |
Output is correct |
| 85 |
Correct |
439 ms |
41088 KB |
Output is correct |
| 86 |
Correct |
433 ms |
43308 KB |
Output is correct |
| 87 |
Correct |
428 ms |
43316 KB |
Output is correct |
