| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 277494 |
2020-08-21T05:22:53 Z |
Fidisk |
Network (BOI15_net) |
C++14 |
|
1 ms |
384 KB |
#include <bits/stdc++.h>
using namespace std;
#define oo 1e9
#define fi first
#define se second
#define sp(iiii) setprecision(iiii)
#define IO ios_base::sync_with_stdio(false); cin.tie(0)
#define ms(aaaa,xxxx) memset(aaaa,xxxx,sizeof(aaaa))
#define cntbit(xxxx) __builtin_popcount(xxxx)
#define getbit(xxxx,aaaa) ((xxxx>>(aaaa-1))&1)
#define _cos(xxxx) cos(xxxx*acos(-1)/180)
#define _sin(xxxx) sin(xxxx*acos(-1)/180)
#define _tan(xxxx) tan(xxxx*acos(-1)/180)
#define PE cout<<fixed
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<pair<int,int>,int> piii;
typedef pair<long long,long long> pll;
typedef pair<pair<long long,long long>,long long> plll;
const ld pi=acos(-1);
int u,v,i,deg[500009],n;
vector<int> ans;
int main() {
cin>>n;
for (i=1;i<n;i++) {
cin>>u>>v;
deg[u]++;
deg[v]++;
}
for (i=1;i<=n;i++) {
if (deg[i]==1) {
ans.push_back(i);
}
}
cout<<(ans.size()+1)/2<<'\n';
for (i=0;i<ans.size()/2;i++) {
cout<<ans[i*2]<<' '<<ans[i*2+1]<<'\n';
}
if (ans.size()%2!=0) {
cout<<ans[ans.size()-1]<<' '<<(ans[ans.size()-1]==1?2:1)<<'\n';
}
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:43:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
43 | for (i=0;i<ans.size()/2;i++) {
| ~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
256 KB |
Output is correct |
| 3 |
Correct |
1 ms |
384 KB |
Output is correct |
| 4 |
Correct |
0 ms |
256 KB |
Output is correct |
| 5 |
Correct |
1 ms |
256 KB |
Output is correct |
| 6 |
Correct |
1 ms |
256 KB |
Output is correct |
| 7 |
Correct |
1 ms |
256 KB |
Output is correct |
| 8 |
Correct |
0 ms |
256 KB |
Output is correct |
| 9 |
Correct |
1 ms |
256 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
256 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
256 KB |
Output is correct |
| 3 |
Correct |
1 ms |
384 KB |
Output is correct |
| 4 |
Correct |
0 ms |
256 KB |
Output is correct |
| 5 |
Correct |
1 ms |
256 KB |
Output is correct |
| 6 |
Correct |
1 ms |
256 KB |
Output is correct |
| 7 |
Correct |
1 ms |
256 KB |
Output is correct |
| 8 |
Correct |
0 ms |
256 KB |
Output is correct |
| 9 |
Correct |
1 ms |
256 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
256 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
256 KB |
Output is correct |
| 3 |
Correct |
1 ms |
384 KB |
Output is correct |
| 4 |
Correct |
0 ms |
256 KB |
Output is correct |
| 5 |
Correct |
1 ms |
256 KB |
Output is correct |
| 6 |
Correct |
1 ms |
256 KB |
Output is correct |
| 7 |
Correct |
1 ms |
256 KB |
Output is correct |
| 8 |
Correct |
0 ms |
256 KB |
Output is correct |
| 9 |
Correct |
1 ms |
256 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
256 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
