oj.uz

Submission #151237

# Submission time Handle Problem Language Result Execution time Memory
151237 2019-09-02T09:43:09 Z cfalas Network (BOI15_net) C++14
63 / 100
 1610 ms 262148 KB 
#include<bits/stdc++.h>
using namespace std;
vector<vector<int> > adj;
vector<int> ans;

void dfs(int s, int p=-1){
	if(adj[s].size()==1){
		ans.push_back(s);
	}
	for(auto v : adj[s] ){
		if(v!=p) dfs(v, s);
	}
}
 
int main(){
	int n;
	adj.assign(n+10000000, vector<int>());
	cin>>n;
	for(int i=0;i<n-1;i++){
		int b, c;
		cin>>b>>c;
		adj[b].push_back(c);
		adj[c].push_back(b);
	}
	dfs(1);
	cout<<(ans.size()+1)/2<<endl;
	for(int i=0;i<(ans.size()+1)/2;i++){
		cout<<ans[i]<<" "<<ans[(i+(ans.size()+1)/2)%ans.size()]<<endl;
	}
 
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<(ans.size()+1)/2;i++){
              ~^~~~~~~~~~~~~~~~~
net.cpp:17:14: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  adj.assign(n+10000000, vector<int>());
             ~^~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 233 ms 235208 KB Output is correct
2 Correct 232 ms 235256 KB Output is correct
3 Correct 232 ms 235188 KB Output is correct
4 Correct 237 ms 235196 KB Output is correct
5 Correct 233 ms 235256 KB Output is correct
6 Correct 234 ms 235192 KB Output is correct
7 Correct 242 ms 235252 KB Output is correct
8 Correct 234 ms 235128 KB Output is correct
9 Correct 244 ms 235256 KB Output is correct
10 Correct 269 ms 235312 KB Output is correct
11 Correct 231 ms 235256 KB Output is correct
12 Correct 233 ms 235256 KB Output is correct
13 Correct 276 ms 235128 KB Output is correct
14 Correct 234 ms 235128 KB Output is correct
15 Correct 268 ms 235092 KB Output is correct
16 Correct 249 ms 235304 KB Output is correct
17 Correct 232 ms 235332 KB Output is correct
18 Correct 234 ms 235256 KB Output is correct
19 Correct 237 ms 235232 KB Output is correct
20 Correct 232 ms 235180 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 233 ms 235208 KB Output is correct
2 Correct 232 ms 235256 KB Output is correct
3 Correct 232 ms 235188 KB Output is correct
4 Correct 237 ms 235196 KB Output is correct
5 Correct 233 ms 235256 KB Output is correct
6 Correct 234 ms 235192 KB Output is correct
7 Correct 242 ms 235252 KB Output is correct
8 Correct 234 ms 235128 KB Output is correct
9 Correct 244 ms 235256 KB Output is correct
10 Correct 269 ms 235312 KB Output is correct
11 Correct 231 ms 235256 KB Output is correct
12 Correct 233 ms 235256 KB Output is correct
13 Correct 276 ms 235128 KB Output is correct
14 Correct 234 ms 235128 KB Output is correct
15 Correct 268 ms 235092 KB Output is correct
16 Correct 249 ms 235304 KB Output is correct
17 Correct 232 ms 235332 KB Output is correct
18 Correct 234 ms 235256 KB Output is correct
19 Correct 237 ms 235232 KB Output is correct
20 Correct 232 ms 235180 KB Output is correct
21 Correct 233 ms 235124 KB Output is correct
22 Correct 240 ms 235364 KB Output is correct
23 Correct 272 ms 235268 KB Output is correct
24 Correct 271 ms 235240 KB Output is correct
25 Correct 267 ms 235260 KB Output is correct
26 Correct 265 ms 235360 KB Output is correct
27 Correct 246 ms 235236 KB Output is correct
28 Correct 236 ms 235240 KB Output is correct
29 Correct 246 ms 235180 KB Output is correct
30 Correct 242 ms 235308 KB Output is correct
31 Correct 260 ms 235252 KB Output is correct
32 Correct 239 ms 235256 KB Output is correct
33 Correct 234 ms 235128 KB Output is correct
34 Correct 232 ms 235128 KB Output is correct
35 Correct 234 ms 235268 KB Output is correct
36 Correct 235 ms 235180 KB Output is correct
37 Correct 236 ms 235212 KB Output is correct
38 Correct 236 ms 235384 KB Output is correct
39 Correct 234 ms 235288 KB Output is correct
40 Correct 234 ms 235228 KB Output is correct
41 Correct 234 ms 235120 KB Output is correct
42 Correct 235 ms 235256 KB Output is correct
43 Correct 239 ms 235256 KB Output is correct
44 Correct 232 ms 235144 KB Output is correct
45 Correct 233 ms 235220 KB Output is correct
46 Correct 236 ms 235176 KB Output is correct
47 Correct 233 ms 235128 KB Output is correct
48 Correct 235 ms 235396 KB Output is correct
49 Correct 236 ms 235208 KB Output is correct
50 Correct 233 ms 235256 KB Output is correct
51 Correct 234 ms 235128 KB Output is correct
52 Correct 234 ms 235128 KB Output is correct
53 Correct 261 ms 235256 KB Output is correct
54 Correct 232 ms 235128 KB Output is correct
55 Correct 243 ms 235128 KB Output is correct
56 Correct 241 ms 235200 KB Output is correct
57 Correct 234 ms 235128 KB Output is correct
58 Correct 236 ms 235256 KB Output is correct

Subtask #3
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 233 ms 235208 KB Output is correct
2 Correct 232 ms 235256 KB Output is correct
3 Correct 232 ms 235188 KB Output is correct
4 Correct 237 ms 235196 KB Output is correct
5 Correct 233 ms 235256 KB Output is correct
6 Correct 234 ms 235192 KB Output is correct
7 Correct 242 ms 235252 KB Output is correct
8 Correct 234 ms 235128 KB Output is correct
9 Correct 244 ms 235256 KB Output is correct
10 Correct 269 ms 235312 KB Output is correct
11 Correct 231 ms 235256 KB Output is correct
12 Correct 233 ms 235256 KB Output is correct
13 Correct 276 ms 235128 KB Output is correct
14 Correct 234 ms 235128 KB Output is correct
15 Correct 268 ms 235092 KB Output is correct
16 Correct 249 ms 235304 KB Output is correct
17 Correct 232 ms 235332 KB Output is correct
18 Correct 234 ms 235256 KB Output is correct
19 Correct 237 ms 235232 KB Output is correct
20 Correct 232 ms 235180 KB Output is correct
21 Correct 233 ms 235124 KB Output is correct
22 Correct 240 ms 235364 KB Output is correct
23 Correct 272 ms 235268 KB Output is correct
24 Correct 271 ms 235240 KB Output is correct
25 Correct 267 ms 235260 KB Output is correct
26 Correct 265 ms 235360 KB Output is correct
27 Correct 246 ms 235236 KB Output is correct
28 Correct 236 ms 235240 KB Output is correct
29 Correct 246 ms 235180 KB Output is correct
30 Correct 242 ms 235308 KB Output is correct
31 Correct 260 ms 235252 KB Output is correct
32 Correct 239 ms 235256 KB Output is correct
33 Correct 234 ms 235128 KB Output is correct
34 Correct 232 ms 235128 KB Output is correct
35 Correct 234 ms 235268 KB Output is correct
36 Correct 235 ms 235180 KB Output is correct
37 Correct 236 ms 235212 KB Output is correct
38 Correct 236 ms 235384 KB Output is correct
39 Correct 234 ms 235288 KB Output is correct
40 Correct 234 ms 235228 KB Output is correct
41 Correct 234 ms 235120 KB Output is correct
42 Correct 235 ms 235256 KB Output is correct
43 Correct 239 ms 235256 KB Output is correct
44 Correct 232 ms 235144 KB Output is correct
45 Correct 233 ms 235220 KB Output is correct
46 Correct 236 ms 235176 KB Output is correct
47 Correct 233 ms 235128 KB Output is correct
48 Correct 235 ms 235396 KB Output is correct
49 Correct 236 ms 235208 KB Output is correct
50 Correct 233 ms 235256 KB Output is correct
51 Correct 234 ms 235128 KB Output is correct
52 Correct 234 ms 235128 KB Output is correct
53 Correct 261 ms 235256 KB Output is correct
54 Correct 232 ms 235128 KB Output is correct
55 Correct 243 ms 235128 KB Output is correct
56 Correct 241 ms 235200 KB Output is correct
57 Correct 234 ms 235128 KB Output is correct
58 Correct 236 ms 235256 KB Output is correct
59 Correct 1477 ms 253584 KB Output is correct
60 Correct 1610 ms 255624 KB Output is correct
61 Correct 235 ms 235128 KB Output is correct
62 Correct 240 ms 235128 KB Output is correct
63 Correct 1305 ms 251960 KB Output is correct
64 Correct 239 ms 235660 KB Output is correct
65 Correct 265 ms 237168 KB Output is correct
66 Correct 550 ms 249208 KB Output is correct
67 Runtime error 1115 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
68 Halted 0 ms 0 KB -