# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
394763 |
2021-04-27T09:41:47 Z |
MHNaderi |
Network (BOI15_net) |
C++14 |
|
501 ms |
45684 KB |
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
//#define int long long
#define pb push_back
#define pii pair<int,int>
#define F first
#define S second
const int maxn=5e5+7;
int n;
vector<int> adj[maxn];
void preprocess(){
cin>>n;
for(int i=1;i<n;i++){
int u,v;
cin>>u>>v;
adj[u].pb(v);
adj[v].pb(u);
}
}
vector<int> ans;
void dfs(int u,int p){
for(auto v : adj[u])
if(v != p)
dfs(v,u);
if(adj[u].size() == 1)
ans.pb(u);
}
void process(){
dfs(1,1);
}
void afterprocess(){
int javab=ans.size()/2;
cout<<javab+(ans.size()%2)<<'\n';
for(int i=0;i<javab;i++)
cout<<ans[i]<<' '<<ans[i+javab]<<'\n';
if(ans.size()%2)
cout<<ans[2*javab]<<' '<<ans[0]<<'\n';
}
int32_t main(){
ios_base::sync_with_stdio(0);
preprocess();process();afterprocess();
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
11980 KB |
Output is correct |
2 |
Correct |
8 ms |
12040 KB |
Output is correct |
3 |
Correct |
8 ms |
12056 KB |
Output is correct |
4 |
Correct |
8 ms |
11980 KB |
Output is correct |
5 |
Correct |
8 ms |
11980 KB |
Output is correct |
6 |
Correct |
8 ms |
11980 KB |
Output is correct |
7 |
Correct |
8 ms |
11984 KB |
Output is correct |
8 |
Correct |
8 ms |
11980 KB |
Output is correct |
9 |
Correct |
8 ms |
12056 KB |
Output is correct |
10 |
Correct |
8 ms |
11984 KB |
Output is correct |
11 |
Correct |
8 ms |
12052 KB |
Output is correct |
12 |
Correct |
8 ms |
12032 KB |
Output is correct |
13 |
Correct |
8 ms |
12056 KB |
Output is correct |
14 |
Correct |
8 ms |
12100 KB |
Output is correct |
15 |
Correct |
8 ms |
12056 KB |
Output is correct |
16 |
Correct |
8 ms |
12064 KB |
Output is correct |
17 |
Correct |
8 ms |
11972 KB |
Output is correct |
18 |
Correct |
8 ms |
12056 KB |
Output is correct |
19 |
Correct |
8 ms |
12044 KB |
Output is correct |
20 |
Correct |
8 ms |
11980 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
11980 KB |
Output is correct |
2 |
Correct |
8 ms |
12040 KB |
Output is correct |
3 |
Correct |
8 ms |
12056 KB |
Output is correct |
4 |
Correct |
8 ms |
11980 KB |
Output is correct |
5 |
Correct |
8 ms |
11980 KB |
Output is correct |
6 |
Correct |
8 ms |
11980 KB |
Output is correct |
7 |
Correct |
8 ms |
11984 KB |
Output is correct |
8 |
Correct |
8 ms |
11980 KB |
Output is correct |
9 |
Correct |
8 ms |
12056 KB |
Output is correct |
10 |
Correct |
8 ms |
11984 KB |
Output is correct |
11 |
Correct |
8 ms |
12052 KB |
Output is correct |
12 |
Correct |
8 ms |
12032 KB |
Output is correct |
13 |
Correct |
8 ms |
12056 KB |
Output is correct |
14 |
Correct |
8 ms |
12100 KB |
Output is correct |
15 |
Correct |
8 ms |
12056 KB |
Output is correct |
16 |
Correct |
8 ms |
12064 KB |
Output is correct |
17 |
Correct |
8 ms |
11972 KB |
Output is correct |
18 |
Correct |
8 ms |
12056 KB |
Output is correct |
19 |
Correct |
8 ms |
12044 KB |
Output is correct |
20 |
Correct |
8 ms |
11980 KB |
Output is correct |
21 |
Correct |
8 ms |
11980 KB |
Output is correct |
22 |
Correct |
9 ms |
12068 KB |
Output is correct |
23 |
Correct |
9 ms |
12108 KB |
Output is correct |
24 |
Correct |
9 ms |
12108 KB |
Output is correct |
25 |
Correct |
9 ms |
12108 KB |
Output is correct |
26 |
Correct |
8 ms |
12072 KB |
Output is correct |
27 |
Correct |
9 ms |
12164 KB |
Output is correct |
28 |
Correct |
10 ms |
12108 KB |
Output is correct |
29 |
Correct |
9 ms |
12112 KB |
Output is correct |
30 |
Correct |
9 ms |
12060 KB |
Output is correct |
31 |
Correct |
9 ms |
12080 KB |
Output is correct |
32 |
Correct |
8 ms |
11980 KB |
Output is correct |
33 |
Correct |
8 ms |
11980 KB |
Output is correct |
34 |
Correct |
8 ms |
11996 KB |
Output is correct |
35 |
Correct |
8 ms |
12056 KB |
Output is correct |
36 |
Correct |
8 ms |
11980 KB |
Output is correct |
37 |
Correct |
8 ms |
12108 KB |
Output is correct |
38 |
Correct |
8 ms |
12064 KB |
Output is correct |
39 |
Correct |
8 ms |
11980 KB |
Output is correct |
40 |
Correct |
8 ms |
11980 KB |
Output is correct |
41 |
Correct |
9 ms |
12056 KB |
Output is correct |
42 |
Correct |
10 ms |
11980 KB |
Output is correct |
43 |
Correct |
10 ms |
12064 KB |
Output is correct |
44 |
Correct |
8 ms |
11980 KB |
Output is correct |
45 |
Correct |
8 ms |
11980 KB |
Output is correct |
46 |
Correct |
8 ms |
11980 KB |
Output is correct |
47 |
Correct |
8 ms |
11980 KB |
Output is correct |
48 |
Correct |
8 ms |
11980 KB |
Output is correct |
49 |
Correct |
8 ms |
12104 KB |
Output is correct |
50 |
Correct |
8 ms |
11980 KB |
Output is correct |
51 |
Correct |
8 ms |
12024 KB |
Output is correct |
52 |
Correct |
8 ms |
11980 KB |
Output is correct |
53 |
Correct |
8 ms |
12096 KB |
Output is correct |
54 |
Correct |
8 ms |
11980 KB |
Output is correct |
55 |
Correct |
8 ms |
12076 KB |
Output is correct |
56 |
Correct |
8 ms |
11980 KB |
Output is correct |
57 |
Correct |
8 ms |
12140 KB |
Output is correct |
58 |
Correct |
9 ms |
12108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
11980 KB |
Output is correct |
2 |
Correct |
8 ms |
12040 KB |
Output is correct |
3 |
Correct |
8 ms |
12056 KB |
Output is correct |
4 |
Correct |
8 ms |
11980 KB |
Output is correct |
5 |
Correct |
8 ms |
11980 KB |
Output is correct |
6 |
Correct |
8 ms |
11980 KB |
Output is correct |
7 |
Correct |
8 ms |
11984 KB |
Output is correct |
8 |
Correct |
8 ms |
11980 KB |
Output is correct |
9 |
Correct |
8 ms |
12056 KB |
Output is correct |
10 |
Correct |
8 ms |
11984 KB |
Output is correct |
11 |
Correct |
8 ms |
12052 KB |
Output is correct |
12 |
Correct |
8 ms |
12032 KB |
Output is correct |
13 |
Correct |
8 ms |
12056 KB |
Output is correct |
14 |
Correct |
8 ms |
12100 KB |
Output is correct |
15 |
Correct |
8 ms |
12056 KB |
Output is correct |
16 |
Correct |
8 ms |
12064 KB |
Output is correct |
17 |
Correct |
8 ms |
11972 KB |
Output is correct |
18 |
Correct |
8 ms |
12056 KB |
Output is correct |
19 |
Correct |
8 ms |
12044 KB |
Output is correct |
20 |
Correct |
8 ms |
11980 KB |
Output is correct |
21 |
Correct |
8 ms |
11980 KB |
Output is correct |
22 |
Correct |
9 ms |
12068 KB |
Output is correct |
23 |
Correct |
9 ms |
12108 KB |
Output is correct |
24 |
Correct |
9 ms |
12108 KB |
Output is correct |
25 |
Correct |
9 ms |
12108 KB |
Output is correct |
26 |
Correct |
8 ms |
12072 KB |
Output is correct |
27 |
Correct |
9 ms |
12164 KB |
Output is correct |
28 |
Correct |
10 ms |
12108 KB |
Output is correct |
29 |
Correct |
9 ms |
12112 KB |
Output is correct |
30 |
Correct |
9 ms |
12060 KB |
Output is correct |
31 |
Correct |
9 ms |
12080 KB |
Output is correct |
32 |
Correct |
8 ms |
11980 KB |
Output is correct |
33 |
Correct |
8 ms |
11980 KB |
Output is correct |
34 |
Correct |
8 ms |
11996 KB |
Output is correct |
35 |
Correct |
8 ms |
12056 KB |
Output is correct |
36 |
Correct |
8 ms |
11980 KB |
Output is correct |
37 |
Correct |
8 ms |
12108 KB |
Output is correct |
38 |
Correct |
8 ms |
12064 KB |
Output is correct |
39 |
Correct |
8 ms |
11980 KB |
Output is correct |
40 |
Correct |
8 ms |
11980 KB |
Output is correct |
41 |
Correct |
9 ms |
12056 KB |
Output is correct |
42 |
Correct |
10 ms |
11980 KB |
Output is correct |
43 |
Correct |
10 ms |
12064 KB |
Output is correct |
44 |
Correct |
8 ms |
11980 KB |
Output is correct |
45 |
Correct |
8 ms |
11980 KB |
Output is correct |
46 |
Correct |
8 ms |
11980 KB |
Output is correct |
47 |
Correct |
8 ms |
11980 KB |
Output is correct |
48 |
Correct |
8 ms |
11980 KB |
Output is correct |
49 |
Correct |
8 ms |
12104 KB |
Output is correct |
50 |
Correct |
8 ms |
11980 KB |
Output is correct |
51 |
Correct |
8 ms |
12024 KB |
Output is correct |
52 |
Correct |
8 ms |
11980 KB |
Output is correct |
53 |
Correct |
8 ms |
12096 KB |
Output is correct |
54 |
Correct |
8 ms |
11980 KB |
Output is correct |
55 |
Correct |
8 ms |
12076 KB |
Output is correct |
56 |
Correct |
8 ms |
11980 KB |
Output is correct |
57 |
Correct |
8 ms |
12140 KB |
Output is correct |
58 |
Correct |
9 ms |
12108 KB |
Output is correct |
59 |
Correct |
374 ms |
30536 KB |
Output is correct |
60 |
Correct |
440 ms |
32500 KB |
Output is correct |
61 |
Correct |
8 ms |
11980 KB |
Output is correct |
62 |
Correct |
8 ms |
11984 KB |
Output is correct |
63 |
Correct |
324 ms |
28696 KB |
Output is correct |
64 |
Correct |
10 ms |
12492 KB |
Output is correct |
65 |
Correct |
19 ms |
14004 KB |
Output is correct |
66 |
Correct |
151 ms |
28492 KB |
Output is correct |
67 |
Correct |
480 ms |
44868 KB |
Output is correct |
68 |
Correct |
501 ms |
45684 KB |
Output is correct |
69 |
Correct |
14 ms |
12876 KB |
Output is correct |
70 |
Correct |
91 ms |
19348 KB |
Output is correct |
71 |
Correct |
311 ms |
35464 KB |
Output is correct |
72 |
Correct |
359 ms |
34784 KB |
Output is correct |
73 |
Correct |
88 ms |
17604 KB |
Output is correct |
74 |
Correct |
446 ms |
31472 KB |
Output is correct |
75 |
Correct |
34 ms |
14704 KB |
Output is correct |
76 |
Correct |
324 ms |
35220 KB |
Output is correct |
77 |
Correct |
321 ms |
35532 KB |
Output is correct |
78 |
Correct |
33 ms |
15044 KB |
Output is correct |
79 |
Correct |
491 ms |
42620 KB |
Output is correct |
80 |
Correct |
10 ms |
12236 KB |
Output is correct |
81 |
Correct |
110 ms |
19380 KB |
Output is correct |
82 |
Correct |
393 ms |
33484 KB |
Output is correct |
83 |
Correct |
447 ms |
31412 KB |
Output is correct |
84 |
Correct |
448 ms |
31444 KB |
Output is correct |
85 |
Correct |
440 ms |
31416 KB |
Output is correct |
86 |
Correct |
442 ms |
32624 KB |
Output is correct |
87 |
Correct |
438 ms |
32436 KB |
Output is correct |