| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 244153 |
2020-07-02T16:55:17 Z |
kimbj0709 |
Network (BOI15_net) |
C++14 |
|
669 ms |
48112 KB |
#include <bits/stdc++.h>
using namespace std;
#define maxn 500050
vector<vector<int> > adj(maxn);
vector<int> leaf;
void dfs(int node,int parent){
for(auto k:adj[node]){
if(k==parent){
continue;
}
dfs(k,node);
}
if(adj[node].size()==1){
leaf.push_back(node);
return;
}
}
int32_t main() {
ios::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
int no_of_input;
int input1,input2;
cin >> no_of_input;
for(int i=0;i<no_of_input-1;i++){
cin >> input1 >> input2;
adj[input1].push_back(input2);
adj[input2].push_back(input1);
}
if(no_of_input==2){
cout << 1 << "\n";
cout << "1 2";
return 0;
}
int root = -1;
for(int i=1;i<=no_of_input;i++){
if(adj[i].size()>=2){
root = i;
break;
}
}
//cout << root << "--\n";
dfs(root,-1);
leaf.push_back(root);
vector<pair<int,int> > ans;
for(int i=0;i<leaf.size()/2;i++){
ans.push_back({leaf[i],leaf[i+leaf.size()/2]});
}
cout << ans.size() << "\n";
for(auto k:ans){
cout << k.first << " " << k.second << "\n";
}
}
Compilation message
net.cpp: In function 'int32_t main()':
net.cpp:45:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<leaf.size()/2;i++){
~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
13 ms |
12148 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 7 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 8 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 19 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
13 ms |
12148 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 7 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 8 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 19 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 22 |
Correct |
16 ms |
12288 KB |
Output is correct |
| 23 |
Correct |
12 ms |
12288 KB |
Output is correct |
| 24 |
Correct |
13 ms |
12288 KB |
Output is correct |
| 25 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 27 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
14 ms |
12288 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 31 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 33 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 36 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
15 ms |
12288 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 46 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 57 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12288 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
13 ms |
12148 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 7 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 8 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 19 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 22 |
Correct |
16 ms |
12288 KB |
Output is correct |
| 23 |
Correct |
12 ms |
12288 KB |
Output is correct |
| 24 |
Correct |
13 ms |
12288 KB |
Output is correct |
| 25 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 27 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
14 ms |
12288 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 31 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 33 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 36 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
15 ms |
12288 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 46 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 57 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12288 KB |
Output is correct |
| 59 |
Correct |
389 ms |
37220 KB |
Output is correct |
| 60 |
Correct |
564 ms |
40292 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 62 |
Correct |
11 ms |
12032 KB |
Output is correct |
| 63 |
Correct |
345 ms |
34908 KB |
Output is correct |
| 64 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 65 |
Correct |
22 ms |
13952 KB |
Output is correct |
| 66 |
Correct |
159 ms |
27896 KB |
Output is correct |
| 67 |
Correct |
669 ms |
46968 KB |
Output is correct |
| 68 |
Correct |
546 ms |
48112 KB |
Output is correct |
| 69 |
Correct |
17 ms |
13056 KB |
Output is correct |
| 70 |
Correct |
99 ms |
21868 KB |
Output is correct |
| 71 |
Correct |
335 ms |
44132 KB |
Output is correct |
| 72 |
Correct |
350 ms |
42464 KB |
Output is correct |
| 73 |
Correct |
113 ms |
19444 KB |
Output is correct |
| 74 |
Correct |
542 ms |
38760 KB |
Output is correct |
| 75 |
Correct |
63 ms |
15604 KB |
Output is correct |
| 76 |
Correct |
352 ms |
43480 KB |
Output is correct |
| 77 |
Correct |
356 ms |
43604 KB |
Output is correct |
| 78 |
Correct |
44 ms |
15608 KB |
Output is correct |
| 79 |
Correct |
579 ms |
45192 KB |
Output is correct |
| 80 |
Correct |
15 ms |
12416 KB |
Output is correct |
| 81 |
Correct |
124 ms |
21896 KB |
Output is correct |
| 82 |
Correct |
424 ms |
41088 KB |
Output is correct |
| 83 |
Correct |
595 ms |
38700 KB |
Output is correct |
| 84 |
Correct |
485 ms |
38764 KB |
Output is correct |
| 85 |
Correct |
535 ms |
38800 KB |
Output is correct |
| 86 |
Correct |
499 ms |
40144 KB |
Output is correct |
| 87 |
Correct |
490 ms |
40172 KB |
Output is correct |
