oj.uz

Submission #923294

# Submission time Handle Problem Language Result Execution time Memory
923294 2024-02-07T05:19:10 Z Aiperiii Network (BOI15_net) C++14
100 / 100
 539 ms 48612 KB 
#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
const int N=5e5+5;
vector <int> g[N];
vector <int> lf;
void dfs(int v,int p){
   if(g[v].size()==1)lf.pb(v);
   for(auto to : g[v]){
      if(to!=p){
         dfs(to,v);
      }
   }
}
signed main(){
   ios_base::sync_with_stdio();
   cin.tie(0);cout.tie(0);
   int n;cin>>n;
   for(int i=0;i<n-1;i++){
      int u,v;
      cin>>u>>v;
      g[u].pb(v);
      g[v].pb(u);
   }
   
   dfs(1,0);
   cout<<(lf.size()+1)/2<<"\n";
   for(int i=0;i<(lf.size()+1)/2;i++){
      cout<<lf[i]<<" "<<lf[i+lf.size()/2]<<"\n";
   }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:32:17: 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]
   32 |    for(int i=0;i<(lf.size()+1)/2;i++){
      |                ~^~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12120 KB Output is correct
2 Correct 3 ms 12120 KB Output is correct
3 Correct 3 ms 12120 KB Output is correct
4 Correct 3 ms 12124 KB Output is correct
5 Correct 3 ms 12120 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12124 KB Output is correct
8 Correct 5 ms 12124 KB Output is correct
9 Correct 4 ms 12180 KB Output is correct
10 Correct 3 ms 12176 KB Output is correct
11 Correct 3 ms 12120 KB Output is correct
12 Correct 3 ms 12124 KB Output is correct
13 Correct 4 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 3 ms 12124 KB Output is correct
16 Correct 3 ms 12120 KB Output is correct
17 Correct 3 ms 12124 KB Output is correct
18 Correct 3 ms 12124 KB Output is correct
19 Correct 4 ms 12124 KB Output is correct
20 Correct 3 ms 12124 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12120 KB Output is correct
2 Correct 3 ms 12120 KB Output is correct
3 Correct 3 ms 12120 KB Output is correct
4 Correct 3 ms 12124 KB Output is correct
5 Correct 3 ms 12120 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12124 KB Output is correct
8 Correct 5 ms 12124 KB Output is correct
9 Correct 4 ms 12180 KB Output is correct
10 Correct 3 ms 12176 KB Output is correct
11 Correct 3 ms 12120 KB Output is correct
12 Correct 3 ms 12124 KB Output is correct
13 Correct 4 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 3 ms 12124 KB Output is correct
16 Correct 3 ms 12120 KB Output is correct
17 Correct 3 ms 12124 KB Output is correct
18 Correct 3 ms 12124 KB Output is correct
19 Correct 4 ms 12124 KB Output is correct
20 Correct 3 ms 12124 KB Output is correct
21 Correct 3 ms 12124 KB Output is correct
22 Correct 4 ms 12124 KB Output is correct
23 Correct 4 ms 12124 KB Output is correct
24 Correct 4 ms 12124 KB Output is correct
25 Correct 4 ms 12120 KB Output is correct
26 Correct 4 ms 12124 KB Output is correct
27 Correct 4 ms 12220 KB Output is correct
28 Correct 4 ms 12124 KB Output is correct
29 Correct 4 ms 12280 KB Output is correct
30 Correct 4 ms 12124 KB Output is correct
31 Correct 4 ms 12124 KB Output is correct
32 Correct 3 ms 12120 KB Output is correct
33 Correct 4 ms 12124 KB Output is correct
34 Correct 3 ms 12124 KB Output is correct
35 Correct 3 ms 12120 KB Output is correct
36 Correct 3 ms 12376 KB Output is correct
37 Correct 4 ms 12124 KB Output is correct
38 Correct 4 ms 12180 KB Output is correct
39 Correct 3 ms 12176 KB Output is correct
40 Correct 3 ms 12120 KB Output is correct
41 Correct 3 ms 12124 KB Output is correct
42 Correct 4 ms 12124 KB Output is correct
43 Correct 3 ms 12124 KB Output is correct
44 Correct 3 ms 12124 KB Output is correct
45 Correct 3 ms 12120 KB Output is correct
46 Correct 4 ms 12124 KB Output is correct
47 Correct 3 ms 12124 KB Output is correct
48 Correct 3 ms 12124 KB Output is correct
49 Correct 3 ms 12124 KB Output is correct
50 Correct 3 ms 12124 KB Output is correct
51 Correct 3 ms 12124 KB Output is correct
52 Correct 3 ms 12120 KB Output is correct
53 Correct 4 ms 12132 KB Output is correct
54 Correct 3 ms 12120 KB Output is correct
55 Correct 4 ms 12120 KB Output is correct
56 Correct 3 ms 12124 KB Output is correct
57 Correct 3 ms 12124 KB Output is correct
58 Correct 4 ms 12120 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12120 KB Output is correct
2 Correct 3 ms 12120 KB Output is correct
3 Correct 3 ms 12120 KB Output is correct
4 Correct 3 ms 12124 KB Output is correct
5 Correct 3 ms 12120 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12124 KB Output is correct
8 Correct 5 ms 12124 KB Output is correct
9 Correct 4 ms 12180 KB Output is correct
10 Correct 3 ms 12176 KB Output is correct
11 Correct 3 ms 12120 KB Output is correct
12 Correct 3 ms 12124 KB Output is correct
13 Correct 4 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 3 ms 12124 KB Output is correct
16 Correct 3 ms 12120 KB Output is correct
17 Correct 3 ms 12124 KB Output is correct
18 Correct 3 ms 12124 KB Output is correct
19 Correct 4 ms 12124 KB Output is correct
20 Correct 3 ms 12124 KB Output is correct
21 Correct 3 ms 12124 KB Output is correct
22 Correct 4 ms 12124 KB Output is correct
23 Correct 4 ms 12124 KB Output is correct
24 Correct 4 ms 12124 KB Output is correct
25 Correct 4 ms 12120 KB Output is correct
26 Correct 4 ms 12124 KB Output is correct
27 Correct 4 ms 12220 KB Output is correct
28 Correct 4 ms 12124 KB Output is correct
29 Correct 4 ms 12280 KB Output is correct
30 Correct 4 ms 12124 KB Output is correct
31 Correct 4 ms 12124 KB Output is correct
32 Correct 3 ms 12120 KB Output is correct
33 Correct 4 ms 12124 KB Output is correct
34 Correct 3 ms 12124 KB Output is correct
35 Correct 3 ms 12120 KB Output is correct
36 Correct 3 ms 12376 KB Output is correct
37 Correct 4 ms 12124 KB Output is correct
38 Correct 4 ms 12180 KB Output is correct
39 Correct 3 ms 12176 KB Output is correct
40 Correct 3 ms 12120 KB Output is correct
41 Correct 3 ms 12124 KB Output is correct
42 Correct 4 ms 12124 KB Output is correct
43 Correct 3 ms 12124 KB Output is correct
44 Correct 3 ms 12124 KB Output is correct
45 Correct 3 ms 12120 KB Output is correct
46 Correct 4 ms 12124 KB Output is correct
47 Correct 3 ms 12124 KB Output is correct
48 Correct 3 ms 12124 KB Output is correct
49 Correct 3 ms 12124 KB Output is correct
50 Correct 3 ms 12124 KB Output is correct
51 Correct 3 ms 12124 KB Output is correct
52 Correct 3 ms 12120 KB Output is correct
53 Correct 4 ms 12132 KB Output is correct
54 Correct 3 ms 12120 KB Output is correct
55 Correct 4 ms 12120 KB Output is correct
56 Correct 3 ms 12124 KB Output is correct
57 Correct 3 ms 12124 KB Output is correct
58 Correct 4 ms 12120 KB Output is correct
59 Correct 374 ms 40976 KB Output is correct
60 Correct 452 ms 43336 KB Output is correct
61 Correct 3 ms 12120 KB Output is correct
62 Correct 3 ms 12124 KB Output is correct
63 Correct 354 ms 36844 KB Output is correct
64 Correct 5 ms 12376 KB Output is correct
65 Correct 16 ms 13980 KB Output is correct
66 Correct 113 ms 27996 KB Output is correct
67 Correct 539 ms 46992 KB Output is correct
68 Correct 534 ms 48612 KB Output is correct
69 Correct 11 ms 13148 KB Output is correct
70 Correct 94 ms 23444 KB Output is correct
71 Correct 350 ms 45872 KB Output is correct
72 Correct 368 ms 44644 KB Output is correct
73 Correct 82 ms 20220 KB Output is correct
74 Correct 458 ms 41136 KB Output is correct
75 Correct 41 ms 15688 KB Output is correct
76 Correct 357 ms 45392 KB Output is correct
77 Correct 340 ms 45436 KB Output is correct
78 Correct 32 ms 15700 KB Output is correct
79 Correct 514 ms 45308 KB Output is correct
80 Correct 5 ms 12376 KB Output is correct
81 Correct 137 ms 22428 KB Output is correct
82 Correct 373 ms 43312 KB Output is correct
83 Correct 450 ms 41380 KB Output is correct
84 Correct 441 ms 41260 KB Output is correct
85 Correct 490 ms 41480 KB Output is correct
86 Correct 425 ms 43488 KB Output is correct
87 Correct 427 ms 44276 KB Output is correct