oj.uz

Submission #108164

# Submission time Handle Problem Language Result Execution time Memory
108164 2019-04-27T19:33:07 Z brcode Network (BOI15_net) C++14
100 / 100
 1217 ms 47860 KB 
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
const int MAXN = 5e5+5;

vector<int> v1[MAXN];
vector<int> v2;
void dfs(int curr,int par){
    if(v1[curr].size() == 1){
        v2.push_back(curr);
    }
    for(int x:v1[curr]){
        if(x != par){
            dfs(x,curr);
        }
    }
}
int main(){
    int n;
    cin>>n;
    for(int i=1;i<n;i++){
        int x,y;
        cin>>x>>y;
        v1[x].push_back(y);
        v1[y].push_back(x);
        
    }
    dfs(1,1);
    if(v2.size()%2 == 0){
        cout<<v2.size()/2<<endl;
        for(int i=0;i<v2.size()/2;i++){
            cout<<v2[i]<<" "<<v2[i+(v2.size()/2)]<<endl;
        }
    }else{
        cout<<(v2.size()/2)+1<<endl;
        for(int i=0;i<v2.size()/2;i++){
            cout<<v2[i]<<" "<<v2[i+(v2.size()/2)+1]<<endl;
        }
        cout<<v2[(v2.size())/2]<<" "<<1<<endl;
    }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<v2.size()/2;i++){
                     ~^~~~~~~~~~~~
net.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<v2.size()/2;i++){
                     ~^~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12032 KB Output is correct
2 Correct 12 ms 12032 KB Output is correct
3 Correct 12 ms 12032 KB Output is correct
4 Correct 13 ms 12032 KB Output is correct
5 Correct 16 ms 12032 KB Output is correct
6 Correct 12 ms 12032 KB Output is correct
7 Correct 12 ms 12032 KB Output is correct
8 Correct 12 ms 12032 KB Output is correct
9 Correct 12 ms 12032 KB Output is correct
10 Correct 12 ms 12032 KB Output is correct
11 Correct 13 ms 12016 KB Output is correct
12 Correct 13 ms 12032 KB Output is correct
13 Correct 13 ms 12032 KB Output is correct
14 Correct 12 ms 12032 KB Output is correct
15 Correct 13 ms 12032 KB Output is correct
16 Correct 14 ms 12032 KB Output is correct
17 Correct 15 ms 12160 KB Output is correct
18 Correct 18 ms 12032 KB Output is correct
19 Correct 13 ms 12032 KB Output is correct
20 Correct 13 ms 12032 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12032 KB Output is correct
2 Correct 12 ms 12032 KB Output is correct
3 Correct 12 ms 12032 KB Output is correct
4 Correct 13 ms 12032 KB Output is correct
5 Correct 16 ms 12032 KB Output is correct
6 Correct 12 ms 12032 KB Output is correct
7 Correct 12 ms 12032 KB Output is correct
8 Correct 12 ms 12032 KB Output is correct
9 Correct 12 ms 12032 KB Output is correct
10 Correct 12 ms 12032 KB Output is correct
11 Correct 13 ms 12016 KB Output is correct
12 Correct 13 ms 12032 KB Output is correct
13 Correct 13 ms 12032 KB Output is correct
14 Correct 12 ms 12032 KB Output is correct
15 Correct 13 ms 12032 KB Output is correct
16 Correct 14 ms 12032 KB Output is correct
17 Correct 15 ms 12160 KB Output is correct
18 Correct 18 ms 12032 KB Output is correct
19 Correct 13 ms 12032 KB Output is correct
20 Correct 13 ms 12032 KB Output is correct
21 Correct 13 ms 12032 KB Output is correct
22 Correct 17 ms 12160 KB Output is correct
23 Correct 17 ms 12160 KB Output is correct
24 Correct 16 ms 12160 KB Output is correct
25 Correct 15 ms 12160 KB Output is correct
26 Correct 18 ms 12160 KB Output is correct
27 Correct 18 ms 12160 KB Output is correct
28 Correct 15 ms 12160 KB Output is correct
29 Correct 16 ms 12032 KB Output is correct
30 Correct 14 ms 12032 KB Output is correct
31 Correct 19 ms 12160 KB Output is correct
32 Correct 13 ms 12032 KB Output is correct
33 Correct 14 ms 12032 KB Output is correct
34 Correct 13 ms 12032 KB Output is correct
35 Correct 14 ms 12032 KB Output is correct
36 Correct 13 ms 12160 KB Output is correct
37 Correct 11 ms 12032 KB Output is correct
38 Correct 12 ms 12156 KB Output is correct
39 Correct 12 ms 12032 KB Output is correct
40 Correct 14 ms 12032 KB Output is correct
41 Correct 14 ms 12004 KB Output is correct
42 Correct 14 ms 12152 KB Output is correct
43 Correct 14 ms 12160 KB Output is correct
44 Correct 12 ms 12032 KB Output is correct
45 Correct 12 ms 12032 KB Output is correct
46 Correct 13 ms 12160 KB Output is correct
47 Correct 13 ms 12032 KB Output is correct
48 Correct 13 ms 12032 KB Output is correct
49 Correct 14 ms 12032 KB Output is correct
50 Correct 13 ms 12032 KB Output is correct
51 Correct 15 ms 12032 KB Output is correct
52 Correct 13 ms 12032 KB Output is correct
53 Correct 15 ms 12160 KB Output is correct
54 Correct 13 ms 12032 KB Output is correct
55 Correct 15 ms 12056 KB Output is correct
56 Correct 13 ms 12032 KB Output is correct
57 Correct 14 ms 12032 KB Output is correct
58 Correct 16 ms 12160 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12032 KB Output is correct
2 Correct 12 ms 12032 KB Output is correct
3 Correct 12 ms 12032 KB Output is correct
4 Correct 13 ms 12032 KB Output is correct
5 Correct 16 ms 12032 KB Output is correct
6 Correct 12 ms 12032 KB Output is correct
7 Correct 12 ms 12032 KB Output is correct
8 Correct 12 ms 12032 KB Output is correct
9 Correct 12 ms 12032 KB Output is correct
10 Correct 12 ms 12032 KB Output is correct
11 Correct 13 ms 12016 KB Output is correct
12 Correct 13 ms 12032 KB Output is correct
13 Correct 13 ms 12032 KB Output is correct
14 Correct 12 ms 12032 KB Output is correct
15 Correct 13 ms 12032 KB Output is correct
16 Correct 14 ms 12032 KB Output is correct
17 Correct 15 ms 12160 KB Output is correct
18 Correct 18 ms 12032 KB Output is correct
19 Correct 13 ms 12032 KB Output is correct
20 Correct 13 ms 12032 KB Output is correct
21 Correct 13 ms 12032 KB Output is correct
22 Correct 17 ms 12160 KB Output is correct
23 Correct 17 ms 12160 KB Output is correct
24 Correct 16 ms 12160 KB Output is correct
25 Correct 15 ms 12160 KB Output is correct
26 Correct 18 ms 12160 KB Output is correct
27 Correct 18 ms 12160 KB Output is correct
28 Correct 15 ms 12160 KB Output is correct
29 Correct 16 ms 12032 KB Output is correct
30 Correct 14 ms 12032 KB Output is correct
31 Correct 19 ms 12160 KB Output is correct
32 Correct 13 ms 12032 KB Output is correct
33 Correct 14 ms 12032 KB Output is correct
34 Correct 13 ms 12032 KB Output is correct
35 Correct 14 ms 12032 KB Output is correct
36 Correct 13 ms 12160 KB Output is correct
37 Correct 11 ms 12032 KB Output is correct
38 Correct 12 ms 12156 KB Output is correct
39 Correct 12 ms 12032 KB Output is correct
40 Correct 14 ms 12032 KB Output is correct
41 Correct 14 ms 12004 KB Output is correct
42 Correct 14 ms 12152 KB Output is correct
43 Correct 14 ms 12160 KB Output is correct
44 Correct 12 ms 12032 KB Output is correct
45 Correct 12 ms 12032 KB Output is correct
46 Correct 13 ms 12160 KB Output is correct
47 Correct 13 ms 12032 KB Output is correct
48 Correct 13 ms 12032 KB Output is correct
49 Correct 14 ms 12032 KB Output is correct
50 Correct 13 ms 12032 KB Output is correct
51 Correct 15 ms 12032 KB Output is correct
52 Correct 13 ms 12032 KB Output is correct
53 Correct 15 ms 12160 KB Output is correct
54 Correct 13 ms 12032 KB Output is correct
55 Correct 15 ms 12056 KB Output is correct
56 Correct 13 ms 12032 KB Output is correct
57 Correct 14 ms 12032 KB Output is correct
58 Correct 16 ms 12160 KB Output is correct
59 Correct 908 ms 36168 KB Output is correct
60 Correct 1031 ms 38860 KB Output is correct
61 Correct 12 ms 12032 KB Output is correct
62 Correct 12 ms 12032 KB Output is correct
63 Correct 732 ms 33640 KB Output is correct
64 Correct 20 ms 12416 KB Output is correct
65 Correct 47 ms 13916 KB Output is correct
66 Correct 278 ms 28000 KB Output is correct
67 Correct 838 ms 46968 KB Output is correct
68 Correct 1051 ms 47860 KB Output is correct
69 Correct 67 ms 13048 KB Output is correct
70 Correct 303 ms 21352 KB Output is correct
71 Correct 981 ms 41988 KB Output is correct
72 Correct 871 ms 40672 KB Output is correct
73 Correct 257 ms 19292 KB Output is correct
74 Correct 999 ms 37872 KB Output is correct
75 Correct 116 ms 15352 KB Output is correct
76 Correct 1008 ms 41568 KB Output is correct
77 Correct 988 ms 41816 KB Output is correct
78 Correct 113 ms 15344 KB Output is correct
79 Correct 936 ms 45180 KB Output is correct
80 Correct 18 ms 12288 KB Output is correct
81 Correct 282 ms 21232 KB Output is correct
82 Correct 1089 ms 39656 KB Output is correct
83 Correct 886 ms 37756 KB Output is correct
84 Correct 996 ms 37872 KB Output is correct
85 Correct 1025 ms 37744 KB Output is correct
86 Correct 1217 ms 38884 KB Output is correct
87 Correct 1047 ms 39016 KB Output is correct