| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 252222 |
2020-07-24T22:05:32 Z |
Blagojce |
Network (BOI15_net) |
C++11 |
|
1 ms |
384 KB |
#include <bits/stdc++.h>
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)
#include <time.h>
#include <cmath>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1000000007;
const ld eps = 1e-13;
const ld pi = 3.14159265359;
mt19937 _rand(time(NULL));
clock_t timer = clock();
const int mxn = 1e5;
int n;
void solve(){
cin >> n;
int deg[n];
memset(deg, 0, sizeof(deg));
fr(i, 0, n-1){
int u, v;
cin >> u >> v;
--u, --v;
++deg[u];
++deg[v];
}
vector<pii> v;
int pr = -1;
fr(i, 0, n){
if(deg[i] == 1){
if(pr == -1) pr = i;
else{
v.pb({pr, i});
pr = -1;
}
}
}
if(pr != -1){
if(pr == 0) ++pr;
v.pb({0, pr});
}
cout<<v.size()<<endl;
for(auto u : v) cout<<u.st+1<<' '<<u.nd+1<<endl;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
solve();
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
384 KB |
Output is correct |
| 3 |
Correct |
0 ms |
384 KB |
Output is correct |
| 4 |
Correct |
0 ms |
384 KB |
Output is correct |
| 5 |
Correct |
0 ms |
384 KB |
Output is correct |
| 6 |
Correct |
1 ms |
384 KB |
Output is correct |
| 7 |
Correct |
0 ms |
384 KB |
Output is correct |
| 8 |
Correct |
0 ms |
384 KB |
Output is correct |
| 9 |
Correct |
0 ms |
384 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
384 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
384 KB |
Output is correct |
| 3 |
Correct |
0 ms |
384 KB |
Output is correct |
| 4 |
Correct |
0 ms |
384 KB |
Output is correct |
| 5 |
Correct |
0 ms |
384 KB |
Output is correct |
| 6 |
Correct |
1 ms |
384 KB |
Output is correct |
| 7 |
Correct |
0 ms |
384 KB |
Output is correct |
| 8 |
Correct |
0 ms |
384 KB |
Output is correct |
| 9 |
Correct |
0 ms |
384 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
384 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
384 KB |
Output is correct |
| 3 |
Correct |
0 ms |
384 KB |
Output is correct |
| 4 |
Correct |
0 ms |
384 KB |
Output is correct |
| 5 |
Correct |
0 ms |
384 KB |
Output is correct |
| 6 |
Correct |
1 ms |
384 KB |
Output is correct |
| 7 |
Correct |
0 ms |
384 KB |
Output is correct |
| 8 |
Correct |
0 ms |
384 KB |
Output is correct |
| 9 |
Correct |
0 ms |
384 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
384 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
