| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 226249 |
2020-04-23T08:05:21 Z |
Fasho |
Network (BOI15_net) |
C++14 |
|
540 ms |
69112 KB |
#include <bits/stdc++.h>
#define N 1000005
#define ll long long int
#define MP make_pair
#define pb push_back
#define ppb pop_back
#define sp " "
#define endl "\n"
#define fi first
#define se second
#define ii pair<int,int>
#define lli pair<ll,ll>
#define fast cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(false)
#define fast2 freopen ("badhair.gir","r",stdin);freopen ("badhair.cik","w",stdout);
#define mod 1000000007
#define fs(x,y) for(ll i=1;i<=y;i++) cin>>x[i]
#define fo(i,x,y) for(ll i=x;i<=y;i++)
#define INF 1000000000005
#define ull unsigned long long int
using namespace std;
ll n,m,ar[N],sum,t;
vector<int> v[N],ans;
void f(int ind,int back)
{
for(int i=0;i<v[ind].size();i++)
{
if(v[ind][i]!=back)
f(v[ind][i],ind);
}
if(v[ind].size()==1)
ans.pb(ind);
}
int main()
{
fast;
cin>>n;
int root=1;
fo(i,1,n-1)
{
int a,b;
cin>>a>>b;
v[a].pb(b);
v[b].pb(a);
if(v[a].size()!=1)
root=a;
if(v[b].size()!=1)
root=b;
}
f(root,root);
cout<<(ans.size()+1)/2<<endl;
for(int i=0;i<ans.size()/2;i++)
cout<<ans[i]<<sp<<ans[i+ans.size()/2]<<endl;
if(ans.size()%2==1)
cout<<ans[ans.size()-1]<<sp<<ans[0]<<endl;
}
Compilation message
net.cpp: In function 'void f(int, int)':
net.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<v[ind].size();i++)
~^~~~~~~~~~~~~~
net.cpp: In function 'int main()':
net.cpp:56:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<ans.size()/2;i++)
~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 2 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 3 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 4 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 5 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 6 |
Correct |
21 ms |
23808 KB |
Output is correct |
| 7 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 8 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 9 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 10 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 11 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 12 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 13 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 14 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 15 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 16 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 17 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 18 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 19 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 20 |
Correct |
18 ms |
23808 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 2 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 3 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 4 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 5 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 6 |
Correct |
21 ms |
23808 KB |
Output is correct |
| 7 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 8 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 9 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 10 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 11 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 12 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 13 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 14 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 15 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 16 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 17 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 18 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 19 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 20 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 21 |
Correct |
22 ms |
23808 KB |
Output is correct |
| 22 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 23 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 24 |
Correct |
19 ms |
23936 KB |
Output is correct |
| 25 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 26 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 27 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 28 |
Correct |
19 ms |
23936 KB |
Output is correct |
| 29 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 30 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 31 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 32 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 33 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 34 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 35 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 36 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 37 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 38 |
Correct |
19 ms |
23920 KB |
Output is correct |
| 39 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 40 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 41 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 42 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 43 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 44 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 45 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 46 |
Correct |
18 ms |
24064 KB |
Output is correct |
| 47 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 48 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 49 |
Correct |
18 ms |
23816 KB |
Output is correct |
| 50 |
Correct |
19 ms |
23808 KB |
Output is correct |
| 51 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 52 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 53 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 54 |
Correct |
20 ms |
24056 KB |
Output is correct |
| 55 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 56 |
Correct |
20 ms |
23808 KB |
Output is correct |
| 57 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 58 |
Correct |
18 ms |
23936 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 2 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 3 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 4 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 5 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 6 |
Correct |
21 ms |
23808 KB |
Output is correct |
| 7 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 8 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 9 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 10 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 11 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 12 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 13 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 14 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 15 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 16 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 17 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 18 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 19 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 20 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 21 |
Correct |
22 ms |
23808 KB |
Output is correct |
| 22 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 23 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 24 |
Correct |
19 ms |
23936 KB |
Output is correct |
| 25 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 26 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 27 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 28 |
Correct |
19 ms |
23936 KB |
Output is correct |
| 29 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 30 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 31 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 32 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 33 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 34 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 35 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 36 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 37 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 38 |
Correct |
19 ms |
23920 KB |
Output is correct |
| 39 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 40 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 41 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 42 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 43 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 44 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 45 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 46 |
Correct |
18 ms |
24064 KB |
Output is correct |
| 47 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 48 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 49 |
Correct |
18 ms |
23816 KB |
Output is correct |
| 50 |
Correct |
19 ms |
23808 KB |
Output is correct |
| 51 |
Correct |
17 ms |
23808 KB |
Output is correct |
| 52 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 53 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 54 |
Correct |
20 ms |
24056 KB |
Output is correct |
| 55 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 56 |
Correct |
20 ms |
23808 KB |
Output is correct |
| 57 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 58 |
Correct |
18 ms |
23936 KB |
Output is correct |
| 59 |
Correct |
382 ms |
47844 KB |
Output is correct |
| 60 |
Correct |
468 ms |
50596 KB |
Output is correct |
| 61 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 62 |
Correct |
18 ms |
23808 KB |
Output is correct |
| 63 |
Correct |
327 ms |
45412 KB |
Output is correct |
| 64 |
Correct |
19 ms |
24192 KB |
Output is correct |
| 65 |
Correct |
31 ms |
25592 KB |
Output is correct |
| 66 |
Correct |
160 ms |
37240 KB |
Output is correct |
| 67 |
Correct |
520 ms |
69112 KB |
Output is correct |
| 68 |
Correct |
526 ms |
59004 KB |
Output is correct |
| 69 |
Correct |
24 ms |
24696 KB |
Output is correct |
| 70 |
Correct |
102 ms |
33152 KB |
Output is correct |
| 71 |
Correct |
348 ms |
53728 KB |
Output is correct |
| 72 |
Correct |
336 ms |
52448 KB |
Output is correct |
| 73 |
Correct |
103 ms |
30964 KB |
Output is correct |
| 74 |
Correct |
457 ms |
49512 KB |
Output is correct |
| 75 |
Correct |
44 ms |
27136 KB |
Output is correct |
| 76 |
Correct |
340 ms |
53328 KB |
Output is correct |
| 77 |
Correct |
319 ms |
53456 KB |
Output is correct |
| 78 |
Correct |
47 ms |
27256 KB |
Output is correct |
| 79 |
Correct |
540 ms |
60664 KB |
Output is correct |
| 80 |
Correct |
19 ms |
24064 KB |
Output is correct |
| 81 |
Correct |
124 ms |
33132 KB |
Output is correct |
| 82 |
Correct |
427 ms |
51304 KB |
Output is correct |
| 83 |
Correct |
445 ms |
49476 KB |
Output is correct |
| 84 |
Correct |
473 ms |
49516 KB |
Output is correct |
| 85 |
Correct |
472 ms |
49444 KB |
Output is correct |
| 86 |
Correct |
460 ms |
50664 KB |
Output is correct |
| 87 |
Correct |
464 ms |
50684 KB |
Output is correct |
