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Submission #580242

# Submission time Handle Problem Language Result Execution time Memory
580242 2022-06-20T19:26:06 Z Omar_Elgedawy Network (BOI15_net) C++14
100 / 100
 658 ms 53888 KB 
#include <bits/stdc++.h>
using namespace std;
#define cin(vec)        for(auto& i : vec) cin >> i
#define cout(vec)       for(auto& i : vec) cout << i << " "; cout << "\n";
#define fast            ios::sync_with_stdio(0);cin.tie(0);
#define loop(i,a,b)     for (int i = a; i < b; i++)
#define F               first
#define S               second
#define pb(n)           push_back(n)
#define pf(n)           push_front(n)
#define dci(d)          fixed<<setprecision(d)
#define sp              ' '
#define el              '\n'
#define all(v)          v.begin(),v.end()
#define int             long long
int dx[8]= {0,0,1,-1,-1,1,1,-1};
int dy[8]= {-1,1,0,0,-1,1,-1,1};
int const N=5e5+5,M=1e3+1,Mod=1e9+7;
vector<int>adj[N],par[N];
vector<int>leaf;
int n;
void dfs(int u,int p){
  if(adj[u].size()==1)leaf.push_back(u);
  for(auto v:adj[u]){
    if(v!=p)dfs(v,u);
  }
}
void testcase(int h){
  cin>>n;
  for(int i=0;i<n-1;i++){
    int u,v;cin>>u>>v;
    adj[u].pb(v);
    adj[v].pb(u);
  }
  dfs(1,-1);
  // cout(leaf);
  int sz=leaf.size();
  if(sz%2){
    cout<<sz/2+1<<el;
    for(int i=0;i<sz/2;i++){
      cout<<leaf[i]<<' '<<leaf[i+sz/2+1]<<el;
    }
    cout<<leaf[sz/2]<<' '<<1<<el;
  }
  else{
    cout<<sz/2<<el;
    for(int i=0;i<sz/2;i++){
      cout<<leaf[i]<<' '<<leaf[i+sz/2]<<el;
    }
  }
}
int32_t main()
{
  // fast
  testcase(1);
  // int tc;cin>>tc;for(int i=1;i<=tc;i++)testcase(i);
  return 0;
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23784 KB Output is correct
2 Correct 13 ms 23744 KB Output is correct
3 Correct 12 ms 23764 KB Output is correct
4 Correct 11 ms 23764 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 13 ms 23764 KB Output is correct
9 Correct 14 ms 23788 KB Output is correct
10 Correct 13 ms 23700 KB Output is correct
11 Correct 13 ms 23792 KB Output is correct
12 Correct 13 ms 23764 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 13 ms 23764 KB Output is correct
15 Correct 12 ms 23712 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 12 ms 23764 KB Output is correct
18 Correct 12 ms 23788 KB Output is correct
19 Correct 12 ms 23764 KB Output is correct
20 Correct 12 ms 23764 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23784 KB Output is correct
2 Correct 13 ms 23744 KB Output is correct
3 Correct 12 ms 23764 KB Output is correct
4 Correct 11 ms 23764 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 13 ms 23764 KB Output is correct
9 Correct 14 ms 23788 KB Output is correct
10 Correct 13 ms 23700 KB Output is correct
11 Correct 13 ms 23792 KB Output is correct
12 Correct 13 ms 23764 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 13 ms 23764 KB Output is correct
15 Correct 12 ms 23712 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 12 ms 23764 KB Output is correct
18 Correct 12 ms 23788 KB Output is correct
19 Correct 12 ms 23764 KB Output is correct
20 Correct 12 ms 23764 KB Output is correct
21 Correct 13 ms 23708 KB Output is correct
22 Correct 13 ms 23892 KB Output is correct
23 Correct 15 ms 23856 KB Output is correct
24 Correct 14 ms 23892 KB Output is correct
25 Correct 13 ms 23828 KB Output is correct
26 Correct 13 ms 23872 KB Output is correct
27 Correct 14 ms 23816 KB Output is correct
28 Correct 14 ms 23892 KB Output is correct
29 Correct 14 ms 23788 KB Output is correct
30 Correct 12 ms 23764 KB Output is correct
31 Correct 14 ms 23892 KB Output is correct
32 Correct 12 ms 23788 KB Output is correct
33 Correct 12 ms 23780 KB Output is correct
34 Correct 13 ms 23764 KB Output is correct
35 Correct 15 ms 23764 KB Output is correct
36 Correct 13 ms 23788 KB Output is correct
37 Correct 13 ms 23764 KB Output is correct
38 Correct 16 ms 23808 KB Output is correct
39 Correct 13 ms 23784 KB Output is correct
40 Correct 12 ms 23764 KB Output is correct
41 Correct 12 ms 23764 KB Output is correct
42 Correct 13 ms 23764 KB Output is correct
43 Correct 13 ms 23764 KB Output is correct
44 Correct 12 ms 23764 KB Output is correct
45 Correct 12 ms 23764 KB Output is correct
46 Correct 14 ms 23788 KB Output is correct
47 Correct 14 ms 23708 KB Output is correct
48 Correct 16 ms 23764 KB Output is correct
49 Correct 14 ms 23808 KB Output is correct
50 Correct 13 ms 23764 KB Output is correct
51 Correct 13 ms 23764 KB Output is correct
52 Correct 12 ms 23764 KB Output is correct
53 Correct 13 ms 23892 KB Output is correct
54 Correct 13 ms 23764 KB Output is correct
55 Correct 13 ms 23764 KB Output is correct
56 Correct 13 ms 23764 KB Output is correct
57 Correct 12 ms 23768 KB Output is correct
58 Correct 14 ms 23832 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23784 KB Output is correct
2 Correct 13 ms 23744 KB Output is correct
3 Correct 12 ms 23764 KB Output is correct
4 Correct 11 ms 23764 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 13 ms 23764 KB Output is correct
7 Correct 12 ms 23764 KB Output is correct
8 Correct 13 ms 23764 KB Output is correct
9 Correct 14 ms 23788 KB Output is correct
10 Correct 13 ms 23700 KB Output is correct
11 Correct 13 ms 23792 KB Output is correct
12 Correct 13 ms 23764 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 13 ms 23764 KB Output is correct
15 Correct 12 ms 23712 KB Output is correct
16 Correct 12 ms 23764 KB Output is correct
17 Correct 12 ms 23764 KB Output is correct
18 Correct 12 ms 23788 KB Output is correct
19 Correct 12 ms 23764 KB Output is correct
20 Correct 12 ms 23764 KB Output is correct
21 Correct 13 ms 23708 KB Output is correct
22 Correct 13 ms 23892 KB Output is correct
23 Correct 15 ms 23856 KB Output is correct
24 Correct 14 ms 23892 KB Output is correct
25 Correct 13 ms 23828 KB Output is correct
26 Correct 13 ms 23872 KB Output is correct
27 Correct 14 ms 23816 KB Output is correct
28 Correct 14 ms 23892 KB Output is correct
29 Correct 14 ms 23788 KB Output is correct
30 Correct 12 ms 23764 KB Output is correct
31 Correct 14 ms 23892 KB Output is correct
32 Correct 12 ms 23788 KB Output is correct
33 Correct 12 ms 23780 KB Output is correct
34 Correct 13 ms 23764 KB Output is correct
35 Correct 15 ms 23764 KB Output is correct
36 Correct 13 ms 23788 KB Output is correct
37 Correct 13 ms 23764 KB Output is correct
38 Correct 16 ms 23808 KB Output is correct
39 Correct 13 ms 23784 KB Output is correct
40 Correct 12 ms 23764 KB Output is correct
41 Correct 12 ms 23764 KB Output is correct
42 Correct 13 ms 23764 KB Output is correct
43 Correct 13 ms 23764 KB Output is correct
44 Correct 12 ms 23764 KB Output is correct
45 Correct 12 ms 23764 KB Output is correct
46 Correct 14 ms 23788 KB Output is correct
47 Correct 14 ms 23708 KB Output is correct
48 Correct 16 ms 23764 KB Output is correct
49 Correct 14 ms 23808 KB Output is correct
50 Correct 13 ms 23764 KB Output is correct
51 Correct 13 ms 23764 KB Output is correct
52 Correct 12 ms 23764 KB Output is correct
53 Correct 13 ms 23892 KB Output is correct
54 Correct 13 ms 23764 KB Output is correct
55 Correct 13 ms 23764 KB Output is correct
56 Correct 13 ms 23764 KB Output is correct
57 Correct 12 ms 23768 KB Output is correct
58 Correct 14 ms 23832 KB Output is correct
59 Correct 494 ms 46496 KB Output is correct
60 Correct 577 ms 48648 KB Output is correct
61 Correct 14 ms 23764 KB Output is correct
62 Correct 12 ms 23764 KB Output is correct
63 Correct 434 ms 43388 KB Output is correct
64 Correct 16 ms 24148 KB Output is correct
65 Correct 32 ms 25496 KB Output is correct
66 Correct 218 ms 37628 KB Output is correct
67 Correct 638 ms 52340 KB Output is correct
68 Correct 658 ms 53888 KB Output is correct
69 Correct 22 ms 24780 KB Output is correct
70 Correct 165 ms 33144 KB Output is correct
71 Correct 480 ms 51008 KB Output is correct
72 Correct 498 ms 49892 KB Output is correct
73 Correct 177 ms 30376 KB Output is correct
74 Correct 597 ms 46496 KB Output is correct
75 Correct 69 ms 27012 KB Output is correct
76 Correct 463 ms 50664 KB Output is correct
77 Correct 493 ms 51008 KB Output is correct
78 Correct 68 ms 26860 KB Output is correct
79 Correct 637 ms 50480 KB Output is correct
80 Correct 22 ms 23988 KB Output is correct
81 Correct 188 ms 32368 KB Output is correct
82 Correct 538 ms 48836 KB Output is correct
83 Correct 583 ms 46448 KB Output is correct
84 Correct 572 ms 46588 KB Output is correct
85 Correct 584 ms 46456 KB Output is correct
86 Correct 588 ms 48780 KB Output is correct
87 Correct 592 ms 48568 KB Output is correct