oj.uz

Submission #330592

# Submission time Handle Problem Language Result Execution time Memory
330592 2020-11-25T21:19:50 Z Sho10 Network (BOI15_net) C++14
100 / 100
 537 ms 52984 KB 
#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10
#define ll long long
#define double long double
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod (10*10*10*10*10*10*10*10*10+7)
#define PI 3.14159265359
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005ll
#define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n;
vector<ll>g[500005];
vector<ll>leaf;
void dfs(ll node,ll par){
if(g[node].size()==1){
    leaf.pb(node);
}
for(auto it : g[node]){
    if(it==par){
        continue;
    }else {
    //cnt++;
    dfs(it,node);
    }
}
}
int32_t main(){
CODE_START;
cin>>n;
for(ll i=1;i<=n-1;i++)
{
    ll x,y;
    cin>>x>>y;
    g[x].pb(y);
    g[y].pb(x);
}
ll cnt=0;
for(ll i=1;i<=n;i++)
{
    if(g[i].size()!=1){
            dfs(i,0);
            break;
    }
}
cout<<(leaf.size()+1)/2<<endl;
for(ll i=0;i<leaf.size()/2;i++)
{
    cout<<leaf[i]<<' '<<leaf[i+leaf.size()/2]<<endl;
}
if(leaf.size()%2){
    cout<<leaf[0]<<' '<<leaf.back()<<endl;
}
}

Compilation message

net.cpp: In function 'int32_t main()':
net.cpp:56:13: 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]
   56 | for(ll i=0;i<leaf.size()/2;i++)
      |            ~^~~~~~~~~~~~~~
net.cpp:47:4: warning: unused variable 'cnt' [-Wunused-variable]
   47 | ll cnt=0;
      |    ^~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 12012 KB Output is correct
2 Correct 8 ms 12012 KB Output is correct
3 Correct 8 ms 12012 KB Output is correct
4 Correct 8 ms 12012 KB Output is correct
5 Correct 8 ms 12012 KB Output is correct
6 Correct 9 ms 12012 KB Output is correct
7 Correct 8 ms 12012 KB Output is correct
8 Correct 8 ms 12012 KB Output is correct
9 Correct 9 ms 12012 KB Output is correct
10 Correct 8 ms 12012 KB Output is correct
11 Correct 8 ms 12012 KB Output is correct
12 Correct 9 ms 12012 KB Output is correct
13 Correct 9 ms 12012 KB Output is correct
14 Correct 8 ms 12012 KB Output is correct
15 Correct 8 ms 12012 KB Output is correct
16 Correct 8 ms 12012 KB Output is correct
17 Correct 9 ms 12012 KB Output is correct
18 Correct 8 ms 12012 KB Output is correct
19 Correct 10 ms 12012 KB Output is correct
20 Correct 9 ms 12012 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 12012 KB Output is correct
2 Correct 8 ms 12012 KB Output is correct
3 Correct 8 ms 12012 KB Output is correct
4 Correct 8 ms 12012 KB Output is correct
5 Correct 8 ms 12012 KB Output is correct
6 Correct 9 ms 12012 KB Output is correct
7 Correct 8 ms 12012 KB Output is correct
8 Correct 8 ms 12012 KB Output is correct
9 Correct 9 ms 12012 KB Output is correct
10 Correct 8 ms 12012 KB Output is correct
11 Correct 8 ms 12012 KB Output is correct
12 Correct 9 ms 12012 KB Output is correct
13 Correct 9 ms 12012 KB Output is correct
14 Correct 8 ms 12012 KB Output is correct
15 Correct 8 ms 12012 KB Output is correct
16 Correct 8 ms 12012 KB Output is correct
17 Correct 9 ms 12012 KB Output is correct
18 Correct 8 ms 12012 KB Output is correct
19 Correct 10 ms 12012 KB Output is correct
20 Correct 9 ms 12012 KB Output is correct
21 Correct 8 ms 12012 KB Output is correct
22 Correct 9 ms 12140 KB Output is correct
23 Correct 9 ms 12140 KB Output is correct
24 Correct 9 ms 12140 KB Output is correct
25 Correct 9 ms 12140 KB Output is correct
26 Correct 9 ms 12140 KB Output is correct
27 Correct 9 ms 12140 KB Output is correct
28 Correct 9 ms 12140 KB Output is correct
29 Correct 9 ms 12140 KB Output is correct
30 Correct 8 ms 12012 KB Output is correct
31 Correct 9 ms 12140 KB Output is correct
32 Correct 8 ms 12012 KB Output is correct
33 Correct 11 ms 12012 KB Output is correct
34 Correct 9 ms 12012 KB Output is correct
35 Correct 9 ms 12012 KB Output is correct
36 Correct 9 ms 12012 KB Output is correct
37 Correct 9 ms 12140 KB Output is correct
38 Correct 9 ms 12140 KB Output is correct
39 Correct 8 ms 12032 KB Output is correct
40 Correct 8 ms 12012 KB Output is correct
41 Correct 8 ms 12140 KB Output is correct
42 Correct 9 ms 12160 KB Output is correct
43 Correct 9 ms 12140 KB Output is correct
44 Correct 8 ms 12012 KB Output is correct
45 Correct 8 ms 12140 KB Output is correct
46 Correct 10 ms 12140 KB Output is correct
47 Correct 8 ms 12012 KB Output is correct
48 Correct 8 ms 12140 KB Output is correct
49 Correct 9 ms 12140 KB Output is correct
50 Correct 8 ms 12012 KB Output is correct
51 Correct 8 ms 12012 KB Output is correct
52 Correct 8 ms 12140 KB Output is correct
53 Correct 9 ms 12268 KB Output is correct
54 Correct 9 ms 12012 KB Output is correct
55 Correct 9 ms 12140 KB Output is correct
56 Correct 8 ms 12012 KB Output is correct
57 Correct 9 ms 12140 KB Output is correct
58 Correct 10 ms 12268 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 12012 KB Output is correct
2 Correct 8 ms 12012 KB Output is correct
3 Correct 8 ms 12012 KB Output is correct
4 Correct 8 ms 12012 KB Output is correct
5 Correct 8 ms 12012 KB Output is correct
6 Correct 9 ms 12012 KB Output is correct
7 Correct 8 ms 12012 KB Output is correct
8 Correct 8 ms 12012 KB Output is correct
9 Correct 9 ms 12012 KB Output is correct
10 Correct 8 ms 12012 KB Output is correct
11 Correct 8 ms 12012 KB Output is correct
12 Correct 9 ms 12012 KB Output is correct
13 Correct 9 ms 12012 KB Output is correct
14 Correct 8 ms 12012 KB Output is correct
15 Correct 8 ms 12012 KB Output is correct
16 Correct 8 ms 12012 KB Output is correct
17 Correct 9 ms 12012 KB Output is correct
18 Correct 8 ms 12012 KB Output is correct
19 Correct 10 ms 12012 KB Output is correct
20 Correct 9 ms 12012 KB Output is correct
21 Correct 8 ms 12012 KB Output is correct
22 Correct 9 ms 12140 KB Output is correct
23 Correct 9 ms 12140 KB Output is correct
24 Correct 9 ms 12140 KB Output is correct
25 Correct 9 ms 12140 KB Output is correct
26 Correct 9 ms 12140 KB Output is correct
27 Correct 9 ms 12140 KB Output is correct
28 Correct 9 ms 12140 KB Output is correct
29 Correct 9 ms 12140 KB Output is correct
30 Correct 8 ms 12012 KB Output is correct
31 Correct 9 ms 12140 KB Output is correct
32 Correct 8 ms 12012 KB Output is correct
33 Correct 11 ms 12012 KB Output is correct
34 Correct 9 ms 12012 KB Output is correct
35 Correct 9 ms 12012 KB Output is correct
36 Correct 9 ms 12012 KB Output is correct
37 Correct 9 ms 12140 KB Output is correct
38 Correct 9 ms 12140 KB Output is correct
39 Correct 8 ms 12032 KB Output is correct
40 Correct 8 ms 12012 KB Output is correct
41 Correct 8 ms 12140 KB Output is correct
42 Correct 9 ms 12160 KB Output is correct
43 Correct 9 ms 12140 KB Output is correct
44 Correct 8 ms 12012 KB Output is correct
45 Correct 8 ms 12140 KB Output is correct
46 Correct 10 ms 12140 KB Output is correct
47 Correct 8 ms 12012 KB Output is correct
48 Correct 8 ms 12140 KB Output is correct
49 Correct 9 ms 12140 KB Output is correct
50 Correct 8 ms 12012 KB Output is correct
51 Correct 8 ms 12012 KB Output is correct
52 Correct 8 ms 12140 KB Output is correct
53 Correct 9 ms 12268 KB Output is correct
54 Correct 9 ms 12012 KB Output is correct
55 Correct 9 ms 12140 KB Output is correct
56 Correct 8 ms 12012 KB Output is correct
57 Correct 9 ms 12140 KB Output is correct
58 Correct 10 ms 12268 KB Output is correct
59 Correct 389 ms 40540 KB Output is correct
60 Correct 473 ms 43480 KB Output is correct
61 Correct 9 ms 12012 KB Output is correct
62 Correct 8 ms 12012 KB Output is correct
63 Correct 333 ms 36820 KB Output is correct
64 Correct 10 ms 12524 KB Output is correct
65 Correct 24 ms 14316 KB Output is correct
66 Correct 158 ms 30624 KB Output is correct
67 Correct 521 ms 51180 KB Output is correct
68 Correct 537 ms 52984 KB Output is correct
69 Correct 15 ms 13164 KB Output is correct
70 Correct 100 ms 23368 KB Output is correct
71 Correct 327 ms 45904 KB Output is correct
72 Correct 351 ms 44364 KB Output is correct
73 Correct 100 ms 20196 KB Output is correct
74 Correct 462 ms 41180 KB Output is correct
75 Correct 32 ms 15716 KB Output is correct
76 Correct 334 ms 45380 KB Output is correct
77 Correct 334 ms 45764 KB Output is correct
78 Correct 34 ms 16236 KB Output is correct
79 Correct 496 ms 48876 KB Output is correct
80 Correct 10 ms 12396 KB Output is correct
81 Correct 120 ms 22624 KB Output is correct
82 Correct 399 ms 43352 KB Output is correct
83 Correct 460 ms 41180 KB Output is correct
84 Correct 466 ms 41308 KB Output is correct
85 Correct 459 ms 41308 KB Output is correct
86 Correct 462 ms 43508 KB Output is correct
87 Correct 457 ms 43484 KB Output is correct