oj.uz

Submission #765395

# Submission time Handle Problem Language Result Execution time Memory
765395 2023-06-24T12:11:39 Z vjudge1 Network (BOI15_net) C++17
100 / 100
 362 ms 52380 KB 
/**
  * Author: Amirrrr
  * Created: 24.06.2023
  * Why am I so stupid? :c
  * Slishkom slab
**/

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
#define all(x) x.begin(), x.end()
#define FF first
#define SS second
#define ent "\n"
#define int long long

const int N = 5e5 + 13;
const int MOD = 1e9 + 7;
const int INF = 1e18;
const int maxn = 1e6 + 12;

int n,x,y,used[N];
vector<int>g[N],ord;

void dfs(int v){
    used[v]=1;
    if(g[v].size()==1){
        ord.pb(v);
    }
    for(auto to:g[v]){
        if(!used[to]){
            dfs(to);
        }
    }
}

void gogo (){
    cin>>n;
    for(int i=1;i<n;i++){
        int x,y;cin>>x>>y;
        g[x].pb(y),g[y].pb(x);
    }
    dfs(1);
    cout<<(ord.size()+1)/2<<ent;
    for(int i=0;i<ord.size()/2;i++){
        cout<<ord[i]<<' '<<ord[i+ord.size()/2]<<ent;
    }
    if(ord.size()%2){
        cout<<ord.back()<<' '<<ord[0]<<ent;
    }
}

signed main (/*Amir Mirmanov*/){
    ios_base::sync_with_stdio(0),cin.tie(0);
    int Q=1,test=1;
    //freopen("rain.in","r",stdin);
	//freopen("rain.out","w",stdout);
    //cin>>Q;
    while (Q --){
        gogo();
    }
    return 0;
}

Compilation message

net.cpp: In function 'void gogo()':
net.cpp:47:18: 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]
   47 |     for(int i=0;i<ord.size()/2;i++){
      |                 ~^~~~~~~~~~~~~
net.cpp: In function 'int main()':
net.cpp:57:13: warning: unused variable 'test' [-Wunused-variable]
   57 |     int Q=1,test=1;
      |             ^~~~

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 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 5 ms 12072 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 5 ms 11988 KB Output is correct
9 Correct 7 ms 12116 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 6 ms 12044 KB Output is correct
13 Correct 5 ms 11988 KB Output is correct
14 Correct 5 ms 11988 KB Output is correct
15 Correct 5 ms 11988 KB Output is correct
16 Correct 5 ms 11988 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 5 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 5 ms 11988 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 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 5 ms 12072 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 5 ms 11988 KB Output is correct
9 Correct 7 ms 12116 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 6 ms 12044 KB Output is correct
13 Correct 5 ms 11988 KB Output is correct
14 Correct 5 ms 11988 KB Output is correct
15 Correct 5 ms 11988 KB Output is correct
16 Correct 5 ms 11988 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 5 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 5 ms 11988 KB Output is correct
21 Correct 5 ms 11988 KB Output is correct
22 Correct 6 ms 12116 KB Output is correct
23 Correct 7 ms 12116 KB Output is correct
24 Correct 6 ms 12116 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 6 ms 12080 KB Output is correct
27 Correct 6 ms 12116 KB Output is correct
28 Correct 6 ms 12116 KB Output is correct
29 Correct 6 ms 12116 KB Output is correct
30 Correct 5 ms 11988 KB Output is correct
31 Correct 6 ms 12116 KB Output is correct
32 Correct 6 ms 11988 KB Output is correct
33 Correct 6 ms 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 6 ms 11988 KB Output is correct
36 Correct 6 ms 11988 KB Output is correct
37 Correct 6 ms 11988 KB Output is correct
38 Correct 6 ms 12116 KB Output is correct
39 Correct 6 ms 11988 KB Output is correct
40 Correct 6 ms 11968 KB Output is correct
41 Correct 5 ms 12068 KB Output is correct
42 Correct 6 ms 11988 KB Output is correct
43 Correct 6 ms 12116 KB Output is correct
44 Correct 6 ms 11988 KB Output is correct
45 Correct 6 ms 11988 KB Output is correct
46 Correct 6 ms 12116 KB Output is correct
47 Correct 7 ms 11956 KB Output is correct
48 Correct 6 ms 11988 KB Output is correct
49 Correct 7 ms 12116 KB Output is correct
50 Correct 6 ms 11988 KB Output is correct
51 Correct 6 ms 11988 KB Output is correct
52 Correct 6 ms 11988 KB Output is correct
53 Correct 9 ms 12244 KB Output is correct
54 Correct 6 ms 11988 KB Output is correct
55 Correct 6 ms 12080 KB Output is correct
56 Correct 6 ms 12076 KB Output is correct
57 Correct 6 ms 11988 KB Output is correct
58 Correct 7 ms 12116 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 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 5 ms 12072 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 5 ms 11988 KB Output is correct
9 Correct 7 ms 12116 KB Output is correct
10 Correct 6 ms 11988 KB Output is correct
11 Correct 6 ms 11988 KB Output is correct
12 Correct 6 ms 12044 KB Output is correct
13 Correct 5 ms 11988 KB Output is correct
14 Correct 5 ms 11988 KB Output is correct
15 Correct 5 ms 11988 KB Output is correct
16 Correct 5 ms 11988 KB Output is correct
17 Correct 5 ms 11988 KB Output is correct
18 Correct 5 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 5 ms 11988 KB Output is correct
21 Correct 5 ms 11988 KB Output is correct
22 Correct 6 ms 12116 KB Output is correct
23 Correct 7 ms 12116 KB Output is correct
24 Correct 6 ms 12116 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 6 ms 12080 KB Output is correct
27 Correct 6 ms 12116 KB Output is correct
28 Correct 6 ms 12116 KB Output is correct
29 Correct 6 ms 12116 KB Output is correct
30 Correct 5 ms 11988 KB Output is correct
31 Correct 6 ms 12116 KB Output is correct
32 Correct 6 ms 11988 KB Output is correct
33 Correct 6 ms 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 6 ms 11988 KB Output is correct
36 Correct 6 ms 11988 KB Output is correct
37 Correct 6 ms 11988 KB Output is correct
38 Correct 6 ms 12116 KB Output is correct
39 Correct 6 ms 11988 KB Output is correct
40 Correct 6 ms 11968 KB Output is correct
41 Correct 5 ms 12068 KB Output is correct
42 Correct 6 ms 11988 KB Output is correct
43 Correct 6 ms 12116 KB Output is correct
44 Correct 6 ms 11988 KB Output is correct
45 Correct 6 ms 11988 KB Output is correct
46 Correct 6 ms 12116 KB Output is correct
47 Correct 7 ms 11956 KB Output is correct
48 Correct 6 ms 11988 KB Output is correct
49 Correct 7 ms 12116 KB Output is correct
50 Correct 6 ms 11988 KB Output is correct
51 Correct 6 ms 11988 KB Output is correct
52 Correct 6 ms 11988 KB Output is correct
53 Correct 9 ms 12244 KB Output is correct
54 Correct 6 ms 11988 KB Output is correct
55 Correct 6 ms 12080 KB Output is correct
56 Correct 6 ms 12076 KB Output is correct
57 Correct 6 ms 11988 KB Output is correct
58 Correct 7 ms 12116 KB Output is correct
59 Correct 228 ms 44016 KB Output is correct
60 Correct 362 ms 47216 KB Output is correct
61 Correct 7 ms 11988 KB Output is correct
62 Correct 6 ms 11988 KB Output is correct
63 Correct 210 ms 39864 KB Output is correct
64 Correct 8 ms 12464 KB Output is correct
65 Correct 13 ms 14164 KB Output is correct
66 Correct 77 ms 29304 KB Output is correct
67 Correct 362 ms 50804 KB Output is correct
68 Correct 344 ms 52380 KB Output is correct
69 Correct 10 ms 13140 KB Output is correct
70 Correct 60 ms 24484 KB Output is correct
71 Correct 191 ms 49708 KB Output is correct
72 Correct 222 ms 48124 KB Output is correct
73 Correct 73 ms 21164 KB Output is correct
74 Correct 296 ms 45008 KB Output is correct
75 Correct 21 ms 16068 KB Output is correct
76 Correct 205 ms 49232 KB Output is correct
77 Correct 192 ms 49400 KB Output is correct
78 Correct 29 ms 16076 KB Output is correct
79 Correct 338 ms 49072 KB Output is correct
80 Correct 7 ms 12372 KB Output is correct
81 Correct 62 ms 23812 KB Output is correct
82 Correct 267 ms 47064 KB Output is correct
83 Correct 285 ms 45000 KB Output is correct
84 Correct 280 ms 45028 KB Output is correct
85 Correct 302 ms 45012 KB Output is correct
86 Correct 293 ms 47332 KB Output is correct
87 Correct 293 ms 47312 KB Output is correct