Submission #434960

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
434960	2021-06-22T14:23:38 Z	Blobo2_Blobo2	Network (BOI15_net)	C++14	100 / 100	638 ms	53272 KB

/*
Editor: Abdelrahman Hossam
Nickname: Blobo2_Blobo2
IOI next year isA :)
*/
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#define all(v)  v.begin(),v.end()
#define gen(arr,n,nxt)  generate(arr,arr+n,nxt)
#define Blobo2_el_gamded_gedan_elly_3ayz_yro7_IOI_w_3ayz_yakol_jilaty ios_base::sync_with_stdio(false);cin.tie(0);

const int mo=1e9+7;
int nxt(){int x;cin>>x;return x;}
bool vis[500001];
vector<int>v;
void dfs(int &cnt,vector<int>adj[],int u=0){
    vis[u]=1;
    if(adj[u].size()==1){
        cnt++;
        v.push_back(u);
    }
    for(auto c:adj[u]){
        if(!vis[c]){
            dfs(cnt,adj,c);
        }
    }
}
signed main(){
    Blobo2_el_gamded_gedan_elly_3ayz_yro7_IOI_w_3ayz_yakol_jilaty
    int n=nxt();
    vector<int>adj[n];
    for(int i=0;i<n-1;i++){
        int x=nxt()-1,y=nxt()-1;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    int cnt=0;
    dfs(cnt,adj);
    cout<<(cnt+1)/2<<endl;
    if(cnt%2==0){
        for(int i=0;i<v.size()/2;i++)
            cout<<v[i]+1<<' '<<v[i+(cnt/2)]+1<<endl;
    }
    else{
        for(int i=0;i<v.size()/2;i++)
            cout<<v[i]+1<<' '<<v[i+(cnt/2+1)]+1<<endl;
        cout<<v[cnt/2]+1<<' ';
        int p = adj[v.back()][0];
        for(int i=0;i<n;i++){
            if(i!=p&&i!=v.back()){
                cout<<i+1<<endl;
                break;
            }
        }
    }
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:45:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for(int i=0;i<v.size()/2;i++)
      |                     ~^~~~~~~~~~~
net.cpp:49:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         for(int i=0;i<v.size()/2;i++)
      |                     ~^~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 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	204 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	204 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	204 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	316 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	204 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	204 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	204 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	204 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	316 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	204 KB	Output is correct
22	Correct	1 ms	460 KB	Output is correct
23	Correct	1 ms	460 KB	Output is correct
24	Correct	2 ms	460 KB	Output is correct
25	Correct	2 ms	460 KB	Output is correct
26	Correct	2 ms	328 KB	Output is correct
27	Correct	2 ms	460 KB	Output is correct
28	Correct	2 ms	460 KB	Output is correct
29	Correct	2 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	1 ms	460 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	324 KB	Output is correct
34	Correct	1 ms	316 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	1 ms	332 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	316 KB	Output is correct
41	Correct	1 ms	332 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	324 KB	Output is correct
44	Correct	1 ms	204 KB	Output is correct
45	Correct	3 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	320 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	1 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	332 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	332 KB	Output is correct
58	Correct	2 ms	504 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 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	204 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	204 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	204 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	316 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	204 KB	Output is correct
22	Correct	1 ms	460 KB	Output is correct
23	Correct	1 ms	460 KB	Output is correct
24	Correct	2 ms	460 KB	Output is correct
25	Correct	2 ms	460 KB	Output is correct
26	Correct	2 ms	328 KB	Output is correct
27	Correct	2 ms	460 KB	Output is correct
28	Correct	2 ms	460 KB	Output is correct
29	Correct	2 ms	332 KB	Output is correct
30	Correct	1 ms	204 KB	Output is correct
31	Correct	1 ms	460 KB	Output is correct
32	Correct	1 ms	204 KB	Output is correct
33	Correct	1 ms	324 KB	Output is correct
34	Correct	1 ms	316 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	1 ms	332 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	316 KB	Output is correct
41	Correct	1 ms	332 KB	Output is correct
42	Correct	1 ms	332 KB	Output is correct
43	Correct	1 ms	324 KB	Output is correct
44	Correct	1 ms	204 KB	Output is correct
45	Correct	3 ms	332 KB	Output is correct
46	Correct	1 ms	332 KB	Output is correct
47	Correct	1 ms	320 KB	Output is correct
48	Correct	1 ms	332 KB	Output is correct
49	Correct	1 ms	332 KB	Output is correct
50	Correct	1 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	332 KB	Output is correct
56	Correct	1 ms	204 KB	Output is correct
57	Correct	1 ms	332 KB	Output is correct
58	Correct	2 ms	504 KB	Output is correct
59	Correct	498 ms	39828 KB	Output is correct
60	Correct	599 ms	43948 KB	Output is correct
61	Correct	1 ms	204 KB	Output is correct
62	Correct	1 ms	204 KB	Output is correct
63	Correct	399 ms	34812 KB	Output is correct
64	Correct	3 ms	844 KB	Output is correct
65	Correct	13 ms	3104 KB	Output is correct
66	Correct	172 ms	23220 KB	Output is correct
67	Correct	595 ms	51660 KB	Output is correct
68	Correct	620 ms	53272 KB	Output is correct
69	Correct	7 ms	1740 KB	Output is correct
70	Correct	106 ms	15476 KB	Output is correct
71	Correct	377 ms	46236 KB	Output is correct
72	Correct	445 ms	44848 KB	Output is correct
73	Correct	94 ms	11672 KB	Output is correct
74	Correct	546 ms	41728 KB	Output is correct
75	Correct	26 ms	5188 KB	Output is correct
76	Correct	367 ms	45840 KB	Output is correct
77	Correct	372 ms	46092 KB	Output is correct
78	Correct	28 ms	5444 KB	Output is correct
79	Correct	638 ms	49328 KB	Output is correct
80	Correct	2 ms	588 KB	Output is correct
81	Correct	120 ms	14892 KB	Output is correct
82	Correct	454 ms	43756 KB	Output is correct
83	Correct	518 ms	41668 KB	Output is correct
84	Correct	528 ms	41636 KB	Output is correct
85	Correct	541 ms	41632 KB	Output is correct
86	Correct	532 ms	43820 KB	Output is correct
87	Correct	549 ms	44000 KB	Output is correct

Submission #434960

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