# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
113186 |
2019-05-24T08:09:29 Z |
Abelyan |
Network (BOI15_net) |
C++17 |
|
832 ms |
78280 KB |
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#define FOR(i,a) for (int i=0;i<(a);++i)
#define FORD(i,a) for (int i=(a)-1;i>=0;i--)
#define FORT(i,a,b) for (int i=(a);i<=(b);++i)
#define FORTD(i,b,a) for (int i=(b);i>=(a);--i)
#define trav(i,v) for (auto i : v)
#define all(v) v.begin(),v.end()
#define ad push_back
#define fr first
#define sc second
#define mpr(a,b) make_pair(a,b)
#define pir pair<int,int>
#define all(v) v.begin(),v.end()
#define make_unique(v) v.erase(unique(all(v),v.end()))
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define dbg(x);
#define dbgv(v);
#define srng mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define y1 EsiHancagorcRepa
#ifdef ALEXPC
#define dbg(x); cout<<#x<<" = "<<x<<endl
#define dbgv(v); cout<<#v<<" = ["; trav(tv,v)cout<<"tv,";cout<<"]"<<endl
#endif
//const int N=100,M=N*N;
const ll MOD=1000*1000*1000+7;
const int N=2*1e6+6,M=6*N,MAXND=N;
const ll MX=1000000000ll*1000000000ll;
int n,d[N];
vector<int> g[N];
vector<int> ans;
void dfs(int v,int par=-1){
if (d[v]==1){
ans.push_back(v);
return;
}
trav(to,g[v])if (to!=par)dfs(to,v);
}
int main(){
fastio;
srng;
cin>>n;
FOR(i,n-1){
int a,b;
cin>>a>>b;
d[a]++;
d[b]++;
g[a].push_back(b);
g[b].push_back(a);
}
FORT(i,1,n){
if (d[i]!=1){
dfs(i);
break;
}
}
int k;
if (ans.size()%2)k=ans.size()/2+1;
else k=ans.size()/2;
cout<<k<<endl;
FOR(i,k){
if (i+k==ans.size()){
cout<<ans[i]<<" "<<ans.back()<<endl;
}
else cout<<ans[i]<<" "<<ans[i+k]<<endl;
}
return 0;
}
/*
3 4
1 2 5
2 3 2
3 1 4
2 3 8
5
2 1 5
2 1 2
2 2 5
2 3 4
2 3 2
*/
Compilation message
net.cpp: In function 'int main()':
net.cpp:71:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (i+k==ans.size()){
~~~^~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
43 ms |
47352 KB |
Output is correct |
2 |
Correct |
48 ms |
47480 KB |
Output is correct |
3 |
Correct |
41 ms |
47352 KB |
Output is correct |
4 |
Correct |
41 ms |
47224 KB |
Output is correct |
5 |
Correct |
41 ms |
47356 KB |
Output is correct |
6 |
Correct |
41 ms |
47352 KB |
Output is correct |
7 |
Correct |
41 ms |
47352 KB |
Output is correct |
8 |
Correct |
51 ms |
47356 KB |
Output is correct |
9 |
Correct |
49 ms |
47352 KB |
Output is correct |
10 |
Correct |
41 ms |
47352 KB |
Output is correct |
11 |
Correct |
40 ms |
47352 KB |
Output is correct |
12 |
Correct |
41 ms |
47360 KB |
Output is correct |
13 |
Correct |
40 ms |
47332 KB |
Output is correct |
14 |
Correct |
40 ms |
47352 KB |
Output is correct |
15 |
Correct |
40 ms |
47352 KB |
Output is correct |
16 |
Correct |
40 ms |
47356 KB |
Output is correct |
17 |
Correct |
41 ms |
47352 KB |
Output is correct |
18 |
Correct |
39 ms |
47312 KB |
Output is correct |
19 |
Correct |
39 ms |
47352 KB |
Output is correct |
20 |
Correct |
40 ms |
47224 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
43 ms |
47352 KB |
Output is correct |
2 |
Correct |
48 ms |
47480 KB |
Output is correct |
3 |
Correct |
41 ms |
47352 KB |
Output is correct |
4 |
Correct |
41 ms |
47224 KB |
Output is correct |
5 |
Correct |
41 ms |
47356 KB |
Output is correct |
6 |
Correct |
41 ms |
47352 KB |
Output is correct |
7 |
Correct |
41 ms |
47352 KB |
Output is correct |
8 |
Correct |
51 ms |
47356 KB |
Output is correct |
9 |
Correct |
49 ms |
47352 KB |
Output is correct |
10 |
Correct |
41 ms |
47352 KB |
Output is correct |
11 |
Correct |
40 ms |
47352 KB |
Output is correct |
12 |
Correct |
41 ms |
47360 KB |
Output is correct |
13 |
Correct |
40 ms |
47332 KB |
Output is correct |
14 |
Correct |
40 ms |
47352 KB |
Output is correct |
15 |
Correct |
40 ms |
47352 KB |
Output is correct |
16 |
Correct |
40 ms |
47356 KB |
Output is correct |
17 |
Correct |
41 ms |
47352 KB |
Output is correct |
18 |
Correct |
39 ms |
47312 KB |
Output is correct |
19 |
Correct |
39 ms |
47352 KB |
Output is correct |
20 |
Correct |
40 ms |
47224 KB |
Output is correct |
21 |
Correct |
41 ms |
47352 KB |
Output is correct |
22 |
Correct |
42 ms |
47480 KB |
Output is correct |
23 |
Correct |
41 ms |
47460 KB |
Output is correct |
24 |
Correct |
42 ms |
47484 KB |
Output is correct |
25 |
Correct |
42 ms |
47480 KB |
Output is correct |
26 |
Correct |
41 ms |
47360 KB |
Output is correct |
27 |
Correct |
42 ms |
47480 KB |
Output is correct |
28 |
Correct |
40 ms |
47480 KB |
Output is correct |
29 |
Correct |
41 ms |
47352 KB |
Output is correct |
30 |
Correct |
40 ms |
47352 KB |
Output is correct |
31 |
Correct |
41 ms |
47488 KB |
Output is correct |
32 |
Correct |
40 ms |
47324 KB |
Output is correct |
33 |
Correct |
41 ms |
47352 KB |
Output is correct |
34 |
Correct |
39 ms |
47352 KB |
Output is correct |
35 |
Correct |
40 ms |
47352 KB |
Output is correct |
36 |
Correct |
40 ms |
47352 KB |
Output is correct |
37 |
Correct |
39 ms |
47352 KB |
Output is correct |
38 |
Correct |
40 ms |
47352 KB |
Output is correct |
39 |
Correct |
41 ms |
47276 KB |
Output is correct |
40 |
Correct |
43 ms |
47352 KB |
Output is correct |
41 |
Correct |
107 ms |
47324 KB |
Output is correct |
42 |
Correct |
41 ms |
47324 KB |
Output is correct |
43 |
Correct |
41 ms |
47352 KB |
Output is correct |
44 |
Correct |
40 ms |
47224 KB |
Output is correct |
45 |
Correct |
42 ms |
47352 KB |
Output is correct |
46 |
Correct |
42 ms |
47352 KB |
Output is correct |
47 |
Correct |
42 ms |
47360 KB |
Output is correct |
48 |
Correct |
41 ms |
47352 KB |
Output is correct |
49 |
Correct |
40 ms |
47352 KB |
Output is correct |
50 |
Correct |
40 ms |
47352 KB |
Output is correct |
51 |
Correct |
39 ms |
47356 KB |
Output is correct |
52 |
Correct |
39 ms |
47352 KB |
Output is correct |
53 |
Correct |
39 ms |
47352 KB |
Output is correct |
54 |
Correct |
40 ms |
47360 KB |
Output is correct |
55 |
Correct |
40 ms |
47360 KB |
Output is correct |
56 |
Correct |
41 ms |
47352 KB |
Output is correct |
57 |
Correct |
42 ms |
47332 KB |
Output is correct |
58 |
Correct |
41 ms |
47488 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
43 ms |
47352 KB |
Output is correct |
2 |
Correct |
48 ms |
47480 KB |
Output is correct |
3 |
Correct |
41 ms |
47352 KB |
Output is correct |
4 |
Correct |
41 ms |
47224 KB |
Output is correct |
5 |
Correct |
41 ms |
47356 KB |
Output is correct |
6 |
Correct |
41 ms |
47352 KB |
Output is correct |
7 |
Correct |
41 ms |
47352 KB |
Output is correct |
8 |
Correct |
51 ms |
47356 KB |
Output is correct |
9 |
Correct |
49 ms |
47352 KB |
Output is correct |
10 |
Correct |
41 ms |
47352 KB |
Output is correct |
11 |
Correct |
40 ms |
47352 KB |
Output is correct |
12 |
Correct |
41 ms |
47360 KB |
Output is correct |
13 |
Correct |
40 ms |
47332 KB |
Output is correct |
14 |
Correct |
40 ms |
47352 KB |
Output is correct |
15 |
Correct |
40 ms |
47352 KB |
Output is correct |
16 |
Correct |
40 ms |
47356 KB |
Output is correct |
17 |
Correct |
41 ms |
47352 KB |
Output is correct |
18 |
Correct |
39 ms |
47312 KB |
Output is correct |
19 |
Correct |
39 ms |
47352 KB |
Output is correct |
20 |
Correct |
40 ms |
47224 KB |
Output is correct |
21 |
Correct |
41 ms |
47352 KB |
Output is correct |
22 |
Correct |
42 ms |
47480 KB |
Output is correct |
23 |
Correct |
41 ms |
47460 KB |
Output is correct |
24 |
Correct |
42 ms |
47484 KB |
Output is correct |
25 |
Correct |
42 ms |
47480 KB |
Output is correct |
26 |
Correct |
41 ms |
47360 KB |
Output is correct |
27 |
Correct |
42 ms |
47480 KB |
Output is correct |
28 |
Correct |
40 ms |
47480 KB |
Output is correct |
29 |
Correct |
41 ms |
47352 KB |
Output is correct |
30 |
Correct |
40 ms |
47352 KB |
Output is correct |
31 |
Correct |
41 ms |
47488 KB |
Output is correct |
32 |
Correct |
40 ms |
47324 KB |
Output is correct |
33 |
Correct |
41 ms |
47352 KB |
Output is correct |
34 |
Correct |
39 ms |
47352 KB |
Output is correct |
35 |
Correct |
40 ms |
47352 KB |
Output is correct |
36 |
Correct |
40 ms |
47352 KB |
Output is correct |
37 |
Correct |
39 ms |
47352 KB |
Output is correct |
38 |
Correct |
40 ms |
47352 KB |
Output is correct |
39 |
Correct |
41 ms |
47276 KB |
Output is correct |
40 |
Correct |
43 ms |
47352 KB |
Output is correct |
41 |
Correct |
107 ms |
47324 KB |
Output is correct |
42 |
Correct |
41 ms |
47324 KB |
Output is correct |
43 |
Correct |
41 ms |
47352 KB |
Output is correct |
44 |
Correct |
40 ms |
47224 KB |
Output is correct |
45 |
Correct |
42 ms |
47352 KB |
Output is correct |
46 |
Correct |
42 ms |
47352 KB |
Output is correct |
47 |
Correct |
42 ms |
47360 KB |
Output is correct |
48 |
Correct |
41 ms |
47352 KB |
Output is correct |
49 |
Correct |
40 ms |
47352 KB |
Output is correct |
50 |
Correct |
40 ms |
47352 KB |
Output is correct |
51 |
Correct |
39 ms |
47356 KB |
Output is correct |
52 |
Correct |
39 ms |
47352 KB |
Output is correct |
53 |
Correct |
39 ms |
47352 KB |
Output is correct |
54 |
Correct |
40 ms |
47360 KB |
Output is correct |
55 |
Correct |
40 ms |
47360 KB |
Output is correct |
56 |
Correct |
41 ms |
47352 KB |
Output is correct |
57 |
Correct |
42 ms |
47332 KB |
Output is correct |
58 |
Correct |
41 ms |
47488 KB |
Output is correct |
59 |
Correct |
588 ms |
67176 KB |
Output is correct |
60 |
Correct |
832 ms |
69480 KB |
Output is correct |
61 |
Correct |
40 ms |
47360 KB |
Output is correct |
62 |
Correct |
41 ms |
47480 KB |
Output is correct |
63 |
Correct |
543 ms |
65188 KB |
Output is correct |
64 |
Correct |
42 ms |
47736 KB |
Output is correct |
65 |
Correct |
58 ms |
49016 KB |
Output is correct |
66 |
Correct |
233 ms |
61688 KB |
Output is correct |
67 |
Correct |
640 ms |
77460 KB |
Output is correct |
68 |
Correct |
653 ms |
78280 KB |
Output is correct |
69 |
Correct |
59 ms |
48120 KB |
Output is correct |
70 |
Correct |
247 ms |
55140 KB |
Output is correct |
71 |
Correct |
669 ms |
72416 KB |
Output is correct |
72 |
Correct |
684 ms |
71652 KB |
Output is correct |
73 |
Correct |
186 ms |
53236 KB |
Output is correct |
74 |
Correct |
760 ms |
68284 KB |
Output is correct |
75 |
Correct |
94 ms |
50168 KB |
Output is correct |
76 |
Correct |
641 ms |
72060 KB |
Output is correct |
77 |
Correct |
661 ms |
72524 KB |
Output is correct |
78 |
Correct |
74 ms |
50428 KB |
Output is correct |
79 |
Correct |
608 ms |
75876 KB |
Output is correct |
80 |
Correct |
43 ms |
47480 KB |
Output is correct |
81 |
Correct |
222 ms |
55132 KB |
Output is correct |
82 |
Correct |
739 ms |
70372 KB |
Output is correct |
83 |
Correct |
706 ms |
68372 KB |
Output is correct |
84 |
Correct |
716 ms |
68208 KB |
Output is correct |
85 |
Correct |
704 ms |
68356 KB |
Output is correct |
86 |
Correct |
738 ms |
69540 KB |
Output is correct |
87 |
Correct |
750 ms |
69452 KB |
Output is correct |