Submission #397643

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
397643	2021-05-02T16:34:32 Z	Iwanttobreakfree	Network (BOI15_net)	C++	100 / 100	841 ms	58328 KB

#include <iostream>
#include <vector>
#include <queue>
using namespace std;
int g,maxi=0;
void dfs(int a,vector<vector<int> >& v,vector<int>& depth,vector<bool>& visto){
	if(depth[a]>maxi){
		maxi=depth[a];
		g=a;
	}
	visto[a]=true;
	for(int x:v[a]){
		if(!visto[x]){
			depth[x]=depth[a]+1;
			dfs(x,v,depth,visto);
		}
	}
}
void bfs(int a,vector<vector<int> >& v){
	int n=v.size();
	int cont=0;
	vector<bool> visto(n,false);
	vector<int> sol;
	queue<int> q;
	q.push(a);
	visto[a]=true;
	while(!q.empty()){
		int nodo=q.front();
		q.pop();
		for(int x:v[nodo]){
			if(!visto[x]){
				visto[x]=true;
				q.push(x);
			}
		}
		if(v[nodo].size()==1)sol.push_back(nodo+1);
	}
	int k=sol.size();
	if(k%2){
		cout<<k/2+1<<'\n';
		for(int i=0;i<k/2;i++){
			cout<<sol[i]<<' '<<sol[k/2+i]<<'\n';
		}
		cout<<sol[k-1]<<' '<<sol[0]<<'\n';
	}
	else{
		cout<<k/2<<'\n';
		for(int i=0;i<k/2;i++){
			cout<<sol[i]<<' '<<sol[k/2+i]<<'\n';
		}
	}
}
int main(){
	int n,a,b;
	cin>>n;
	vector<vector<int> >v(n,vector<int>());
	for(int i=0;i<n-1;i++){
		cin>>a>>b;
		a--;b--;
		v[a].push_back(b);
		v[b].push_back(a);
	}
	vector<bool> visto(n,false);
	vector<int> depth(n,0);
	dfs(0,v,depth,visto);
	bfs(g,v);
}

Compilation message

net.cpp: In function 'void bfs(int, std::vector<std::vector<int> >&)':
net.cpp:21:6: warning: unused variable 'cont' [-Wunused-variable]
   21 |  int cont=0;
      |      ^~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	208 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	208 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	296 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	204 KB	Output is correct
14	Correct	1 ms	208 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	208 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	208 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	296 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	204 KB	Output is correct
14	Correct	1 ms	208 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	296 KB	Output is correct
22	Correct	3 ms	428 KB	Output is correct
23	Correct	2 ms	436 KB	Output is correct
24	Correct	2 ms	460 KB	Output is correct
25	Correct	2 ms	332 KB	Output is correct
26	Correct	2 ms	332 KB	Output is correct
27	Correct	2 ms	440 KB	Output is correct
28	Correct	2 ms	332 KB	Output is correct
29	Correct	2 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	3 ms	332 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	204 KB	Output is correct
34	Correct	1 ms	300 KB	Output is correct
35	Correct	1 ms	204 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	2 ms	332 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	204 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	300 KB	Output is correct
44	Correct	1 ms	204 KB	Output is correct
45	Correct	1 ms	296 KB	Output is correct
46	Correct	1 ms	300 KB	Output is correct
47	Correct	1 ms	204 KB	Output is correct
48	Correct	1 ms	204 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	2 ms	204 KB	Output is correct
51	Correct	1 ms	204 KB	Output is correct
52	Correct	1 ms	332 KB	Output is correct
53	Correct	1 ms	332 KB	Output is correct
54	Correct	1 ms	204 KB	Output is correct
55	Correct	1 ms	204 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	296 KB	Output is correct
58	Correct	2 ms	460 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	208 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	208 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	296 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	1 ms	204 KB	Output is correct
14	Correct	1 ms	208 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	296 KB	Output is correct
22	Correct	3 ms	428 KB	Output is correct
23	Correct	2 ms	436 KB	Output is correct
24	Correct	2 ms	460 KB	Output is correct
25	Correct	2 ms	332 KB	Output is correct
26	Correct	2 ms	332 KB	Output is correct
27	Correct	2 ms	440 KB	Output is correct
28	Correct	2 ms	332 KB	Output is correct
29	Correct	2 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	3 ms	332 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	204 KB	Output is correct
34	Correct	1 ms	300 KB	Output is correct
35	Correct	1 ms	204 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	332 KB	Output is correct
38	Correct	2 ms	332 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	204 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	300 KB	Output is correct
44	Correct	1 ms	204 KB	Output is correct
45	Correct	1 ms	296 KB	Output is correct
46	Correct	1 ms	300 KB	Output is correct
47	Correct	1 ms	204 KB	Output is correct
48	Correct	1 ms	204 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	2 ms	204 KB	Output is correct
51	Correct	1 ms	204 KB	Output is correct
52	Correct	1 ms	332 KB	Output is correct
53	Correct	1 ms	332 KB	Output is correct
54	Correct	1 ms	204 KB	Output is correct
55	Correct	1 ms	204 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	296 KB	Output is correct
58	Correct	2 ms	460 KB	Output is correct
59	Correct	671 ms	37908 KB	Output is correct
60	Correct	775 ms	40836 KB	Output is correct
61	Correct	1 ms	204 KB	Output is correct
62	Correct	1 ms	204 KB	Output is correct
63	Correct	589 ms	34104 KB	Output is correct
64	Correct	5 ms	972 KB	Output is correct
65	Correct	22 ms	3408 KB	Output is correct
66	Correct	264 ms	26504 KB	Output is correct
67	Correct	828 ms	57532 KB	Output is correct
68	Correct	839 ms	58328 KB	Output is correct
69	Correct	13 ms	1612 KB	Output is correct
70	Correct	166 ms	14440 KB	Output is correct
71	Correct	592 ms	46116 KB	Output is correct
72	Correct	608 ms	44564 KB	Output is correct
73	Correct	163 ms	11244 KB	Output is correct
74	Correct	773 ms	39856 KB	Output is correct
75	Correct	51 ms	5072 KB	Output is correct
76	Correct	593 ms	44828 KB	Output is correct
77	Correct	582 ms	45032 KB	Output is correct
78	Correct	51 ms	5516 KB	Output is correct
79	Correct	841 ms	54556 KB	Output is correct
80	Correct	4 ms	588 KB	Output is correct
81	Correct	208 ms	14676 KB	Output is correct
82	Correct	683 ms	42688 KB	Output is correct
83	Correct	789 ms	39812 KB	Output is correct
84	Correct	778 ms	39852 KB	Output is correct
85	Correct	757 ms	39992 KB	Output is correct
86	Correct	743 ms	41012 KB	Output is correct
87	Correct	747 ms	41008 KB	Output is correct

Submission #397643

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0