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Submission #910034

# Submission time Handle Problem Language Result Execution time Memory
910034 2024-01-17T18:34:56 Z Petrix Network (BOI15_net) C++17
100 / 100
 641 ms 61324 KB 
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define int long long

vector<vector<int>> v;
int frunza[500001],p[500001];
vector<pair<int,int>> rasp;
int cnt;

void dfs(int parinte,int nod){
    p[nod]=cnt;cnt++;
    int aux=0,i;
    for(i=0;i<v[nod].size();i++){
        if(v[nod][i]!=parinte){
            dfs(nod,v[nod][i]);
            aux++;
        }
    }
    if(!aux) frunza[nod]=1;
}

signed main()
{
    int n,i,a,b;cnt=0;
    cin>>n;v.resize(n+1);
    for(i=0;i<n-1;i++){
        cin>>a>>b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    dfs(-1,1);
    for(i=1;i<=n;i++){
        if((i==1 && v[1].size()==1) || frunza[i])
            rasp.push_back({p[i],i});
    }
    cout<<(1ll*rasp.size()+1)/2<<"\n";
    sort(rasp.begin(),rasp.end());
    for(i=0;i<(1ll*rasp.size()+1ll)/2ll;i++){
        cout<<rasp[i].second<<" "<<rasp[i+(rasp.size()/2)].second<<"\n";
    }
    return 0;
}

Compilation message

net.cpp: In function 'void dfs(long long int, long long int)':
net.cpp:16:14: 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]
   16 |     for(i=0;i<v[nod].size();i++){
      |             ~^~~~~~~~~~~~~~
net.cpp: In function 'int main()':
net.cpp:41:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   41 |     for(i=0;i<(1ll*rasp.size()+1ll)/2ll;i++){
      |             ~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 1 ms 2224 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 1 ms 2224 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2396 KB Output is correct
22 Correct 2 ms 2592 KB Output is correct
23 Correct 2 ms 2648 KB Output is correct
24 Correct 2 ms 2652 KB Output is correct
25 Correct 2 ms 2652 KB Output is correct
26 Correct 1 ms 2392 KB Output is correct
27 Correct 2 ms 2652 KB Output is correct
28 Correct 2 ms 2652 KB Output is correct
29 Correct 2 ms 2652 KB Output is correct
30 Correct 1 ms 2396 KB Output is correct
31 Correct 2 ms 2652 KB Output is correct
32 Correct 1 ms 2396 KB Output is correct
33 Correct 1 ms 2396 KB Output is correct
34 Correct 1 ms 2396 KB Output is correct
35 Correct 1 ms 2396 KB Output is correct
36 Correct 1 ms 2392 KB Output is correct
37 Correct 1 ms 2392 KB Output is correct
38 Correct 1 ms 2496 KB Output is correct
39 Correct 1 ms 2396 KB Output is correct
40 Correct 1 ms 2396 KB Output is correct
41 Correct 1 ms 2396 KB Output is correct
42 Correct 1 ms 2396 KB Output is correct
43 Correct 1 ms 2396 KB Output is correct
44 Correct 1 ms 2396 KB Output is correct
45 Correct 1 ms 2396 KB Output is correct
46 Correct 1 ms 2396 KB Output is correct
47 Correct 1 ms 2396 KB Output is correct
48 Correct 1 ms 2396 KB Output is correct
49 Correct 2 ms 2396 KB Output is correct
50 Correct 1 ms 2396 KB Output is correct
51 Correct 1 ms 2396 KB Output is correct
52 Correct 1 ms 2396 KB Output is correct
53 Correct 1 ms 2396 KB Output is correct
54 Correct 1 ms 2396 KB Output is correct
55 Correct 1 ms 2396 KB Output is correct
56 Correct 1 ms 2396 KB Output is correct
57 Correct 1 ms 2396 KB Output is correct
58 Correct 2 ms 2648 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 1 ms 2224 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2396 KB Output is correct
22 Correct 2 ms 2592 KB Output is correct
23 Correct 2 ms 2648 KB Output is correct
24 Correct 2 ms 2652 KB Output is correct
25 Correct 2 ms 2652 KB Output is correct
26 Correct 1 ms 2392 KB Output is correct
27 Correct 2 ms 2652 KB Output is correct
28 Correct 2 ms 2652 KB Output is correct
29 Correct 2 ms 2652 KB Output is correct
30 Correct 1 ms 2396 KB Output is correct
31 Correct 2 ms 2652 KB Output is correct
32 Correct 1 ms 2396 KB Output is correct
33 Correct 1 ms 2396 KB Output is correct
34 Correct 1 ms 2396 KB Output is correct
35 Correct 1 ms 2396 KB Output is correct
36 Correct 1 ms 2392 KB Output is correct
37 Correct 1 ms 2392 KB Output is correct
38 Correct 1 ms 2496 KB Output is correct
39 Correct 1 ms 2396 KB Output is correct
40 Correct 1 ms 2396 KB Output is correct
41 Correct 1 ms 2396 KB Output is correct
42 Correct 1 ms 2396 KB Output is correct
43 Correct 1 ms 2396 KB Output is correct
44 Correct 1 ms 2396 KB Output is correct
45 Correct 1 ms 2396 KB Output is correct
46 Correct 1 ms 2396 KB Output is correct
47 Correct 1 ms 2396 KB Output is correct
48 Correct 1 ms 2396 KB Output is correct
49 Correct 2 ms 2396 KB Output is correct
50 Correct 1 ms 2396 KB Output is correct
51 Correct 1 ms 2396 KB Output is correct
52 Correct 1 ms 2396 KB Output is correct
53 Correct 1 ms 2396 KB Output is correct
54 Correct 1 ms 2396 KB Output is correct
55 Correct 1 ms 2396 KB Output is correct
56 Correct 1 ms 2396 KB Output is correct
57 Correct 1 ms 2396 KB Output is correct
58 Correct 2 ms 2648 KB Output is correct
59 Correct 478 ms 51760 KB Output is correct
60 Correct 621 ms 56508 KB Output is correct
61 Correct 1 ms 2396 KB Output is correct
62 Correct 1 ms 2396 KB Output is correct
63 Correct 427 ms 45628 KB Output is correct
64 Correct 5 ms 2908 KB Output is correct
65 Correct 15 ms 7260 KB Output is correct
66 Correct 135 ms 29692 KB Output is correct
67 Correct 641 ms 57564 KB Output is correct
68 Correct 641 ms 61324 KB Output is correct
69 Correct 10 ms 4052 KB Output is correct
70 Correct 115 ms 23128 KB Output is correct
71 Correct 444 ms 57848 KB Output is correct
72 Correct 461 ms 55536 KB Output is correct
73 Correct 95 ms 18916 KB Output is correct
74 Correct 631 ms 50884 KB Output is correct
75 Correct 35 ms 12104 KB Output is correct
76 Correct 469 ms 57004 KB Output is correct
77 Correct 443 ms 57256 KB Output is correct
78 Correct 34 ms 11984 KB Output is correct
79 Correct 634 ms 55228 KB Output is correct
80 Correct 3 ms 2904 KB Output is correct
81 Correct 124 ms 22084 KB Output is correct
82 Correct 527 ms 55548 KB Output is correct
83 Correct 541 ms 50884 KB Output is correct
84 Correct 551 ms 51088 KB Output is correct
85 Correct 608 ms 51096 KB Output is correct
86 Correct 541 ms 55736 KB Output is correct
87 Correct 575 ms 54992 KB Output is correct