oj.uz

Submission #630415

# Submission time Handle Problem Language Result Execution time Memory
630415 2022-08-16T10:42:37 Z MasterTaster Network (BOI15_net) C++14
100 / 100
 587 ms 43428 KB 
#include <bits/stdc++.h>
 
#define pb push_back
#define ll long long
#define pii pair<int, int>
#define xx first
#define yy second
#define MAXN 500010
 
using namespace std;
 
int n;
vector<int> g[MAXN], listovi;
bool bio[MAXN];
 
void dfs(int u)
{
    bio[u]=true;
    if (g[u].size()==1) listovi.pb(u);
    for (auto v:g[u]) if (!bio[v]) dfs(v);
}
 
int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
 
    cin>>n;
    if (n==1) { cout<<1<<endl<<1<<" "<<1; exit(0); }
    if (n==2) { cout<<1<<endl<<1<<" "<<2; exit(0); }
 
    for (int i=1; i<n; i++)
    {
        int u, v; cin>>u>>v;
        g[u].pb(v);
        g[v].pb(u);
    }
 
    for (int i=1; i<=n; i++) if (g[i].size()!=1) { dfs(i); break; }
 
    //for (int i=0; i<listovi.size(); i++) cout<<listovi[i]<<" ";
 
    cout<<(listovi.size()+1)/2<<endl;
    for (int i=0; i<listovi.size()/2; i++)
    {
        cout<<listovi[i]<<" "<<listovi[i+listovi.size()/2]<<endl;
    }
    if (listovi.size()%2) cout<<listovi[listovi.size()-2]<<" "<<listovi[listovi.size()-1];
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:43:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i=0; i<listovi.size()/2; i++)
      |                   ~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11988 KB Output is correct
2 Correct 6 ms 12064 KB Output is correct
3 Correct 7 ms 12064 KB Output is correct
4 Correct 6 ms 12072 KB Output is correct
5 Correct 6 ms 12072 KB Output is correct
6 Correct 6 ms 12072 KB Output is correct
7 Correct 6 ms 12072 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 7 ms 12072 KB Output is correct
12 Correct 6 ms 12000 KB Output is correct
13 Correct 7 ms 12068 KB Output is correct
14 Correct 6 ms 12068 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 12068 KB Output is correct
17 Correct 7 ms 12072 KB Output is correct
18 Correct 8 ms 12072 KB Output is correct
19 Correct 8 ms 11988 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11988 KB Output is correct
2 Correct 6 ms 12064 KB Output is correct
3 Correct 7 ms 12064 KB Output is correct
4 Correct 6 ms 12072 KB Output is correct
5 Correct 6 ms 12072 KB Output is correct
6 Correct 6 ms 12072 KB Output is correct
7 Correct 6 ms 12072 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 7 ms 12072 KB Output is correct
12 Correct 6 ms 12000 KB Output is correct
13 Correct 7 ms 12068 KB Output is correct
14 Correct 6 ms 12068 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 12068 KB Output is correct
17 Correct 7 ms 12072 KB Output is correct
18 Correct 8 ms 12072 KB Output is correct
19 Correct 8 ms 11988 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 7 ms 11984 KB Output is correct
22 Correct 8 ms 12116 KB Output is correct
23 Correct 8 ms 12108 KB Output is correct
24 Correct 8 ms 12116 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 8 ms 12136 KB Output is correct
28 Correct 9 ms 12084 KB Output is correct
29 Correct 8 ms 12116 KB Output is correct
30 Correct 8 ms 11988 KB Output is correct
31 Correct 9 ms 12076 KB Output is correct
32 Correct 8 ms 12072 KB Output is correct
33 Correct 6 ms 12072 KB Output is correct
34 Correct 8 ms 12052 KB Output is correct
35 Correct 6 ms 11988 KB Output is correct
36 Correct 8 ms 12068 KB Output is correct
37 Correct 12 ms 12080 KB Output is correct
38 Correct 7 ms 12116 KB Output is correct
39 Correct 7 ms 11988 KB Output is correct
40 Correct 7 ms 12016 KB Output is correct
41 Correct 7 ms 11988 KB Output is correct
42 Correct 9 ms 12068 KB Output is correct
43 Correct 7 ms 12116 KB Output is correct
44 Correct 7 ms 12064 KB Output is correct
45 Correct 6 ms 11988 KB Output is correct
46 Correct 8 ms 11988 KB Output is correct
47 Correct 6 ms 11988 KB Output is correct
48 Correct 7 ms 12064 KB Output is correct
49 Correct 8 ms 12076 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 7 ms 11976 KB Output is correct
52 Correct 7 ms 12076 KB Output is correct
53 Correct 7 ms 12048 KB Output is correct
54 Correct 7 ms 11988 KB Output is correct
55 Correct 7 ms 11988 KB Output is correct
56 Correct 6 ms 11988 KB Output is correct
57 Correct 7 ms 12064 KB Output is correct
58 Correct 9 ms 12176 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11988 KB Output is correct
2 Correct 6 ms 12064 KB Output is correct
3 Correct 7 ms 12064 KB Output is correct
4 Correct 6 ms 12072 KB Output is correct
5 Correct 6 ms 12072 KB Output is correct
6 Correct 6 ms 12072 KB Output is correct
7 Correct 6 ms 12072 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 7 ms 12072 KB Output is correct
12 Correct 6 ms 12000 KB Output is correct
13 Correct 7 ms 12068 KB Output is correct
14 Correct 6 ms 12068 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 12068 KB Output is correct
17 Correct 7 ms 12072 KB Output is correct
18 Correct 8 ms 12072 KB Output is correct
19 Correct 8 ms 11988 KB Output is correct
20 Correct 7 ms 12068 KB Output is correct
21 Correct 7 ms 11984 KB Output is correct
22 Correct 8 ms 12116 KB Output is correct
23 Correct 8 ms 12108 KB Output is correct
24 Correct 8 ms 12116 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 8 ms 12136 KB Output is correct
28 Correct 9 ms 12084 KB Output is correct
29 Correct 8 ms 12116 KB Output is correct
30 Correct 8 ms 11988 KB Output is correct
31 Correct 9 ms 12076 KB Output is correct
32 Correct 8 ms 12072 KB Output is correct
33 Correct 6 ms 12072 KB Output is correct
34 Correct 8 ms 12052 KB Output is correct
35 Correct 6 ms 11988 KB Output is correct
36 Correct 8 ms 12068 KB Output is correct
37 Correct 12 ms 12080 KB Output is correct
38 Correct 7 ms 12116 KB Output is correct
39 Correct 7 ms 11988 KB Output is correct
40 Correct 7 ms 12016 KB Output is correct
41 Correct 7 ms 11988 KB Output is correct
42 Correct 9 ms 12068 KB Output is correct
43 Correct 7 ms 12116 KB Output is correct
44 Correct 7 ms 12064 KB Output is correct
45 Correct 6 ms 11988 KB Output is correct
46 Correct 8 ms 11988 KB Output is correct
47 Correct 6 ms 11988 KB Output is correct
48 Correct 7 ms 12064 KB Output is correct
49 Correct 8 ms 12076 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 7 ms 11976 KB Output is correct
52 Correct 7 ms 12076 KB Output is correct
53 Correct 7 ms 12048 KB Output is correct
54 Correct 7 ms 11988 KB Output is correct
55 Correct 7 ms 11988 KB Output is correct
56 Correct 6 ms 11988 KB Output is correct
57 Correct 7 ms 12064 KB Output is correct
58 Correct 9 ms 12176 KB Output is correct
59 Correct 503 ms 32232 KB Output is correct
60 Correct 577 ms 34528 KB Output is correct
61 Correct 7 ms 11988 KB Output is correct
62 Correct 6 ms 12064 KB Output is correct
63 Correct 458 ms 30416 KB Output is correct
64 Correct 8 ms 12500 KB Output is correct
65 Correct 20 ms 13964 KB Output is correct
66 Correct 138 ms 27380 KB Output is correct
67 Correct 431 ms 42584 KB Output is correct
68 Correct 471 ms 43428 KB Output is correct
69 Correct 21 ms 12844 KB Output is correct
70 Correct 150 ms 20792 KB Output is correct
71 Correct 576 ms 37400 KB Output is correct
72 Correct 534 ms 36640 KB Output is correct
73 Correct 116 ms 18988 KB Output is correct
74 Correct 531 ms 33336 KB Output is correct
75 Correct 53 ms 15324 KB Output is correct
76 Correct 531 ms 37072 KB Output is correct
77 Correct 587 ms 37332 KB Output is correct
78 Correct 42 ms 15520 KB Output is correct
79 Correct 446 ms 40844 KB Output is correct
80 Correct 9 ms 12244 KB Output is correct
81 Correct 156 ms 20764 KB Output is correct
82 Correct 567 ms 35212 KB Output is correct
83 Correct 519 ms 33168 KB Output is correct
84 Correct 572 ms 33268 KB Output is correct
85 Correct 520 ms 33208 KB Output is correct
86 Correct 557 ms 34380 KB Output is correct
87 Correct 568 ms 34352 KB Output is correct