oj.uz

Submission #666806

# Submission time Handle Problem Language Result Execution time Memory
666806 2022-11-29T18:23:11 Z divad Network (BOI15_net) C++14
100 / 100
 625 ms 49668 KB 
#include <iostream>
#include <algorithm>
#include <vector>
#define MAX 500002
using namespace std;
int n,x,y,vf[MAX];
vector<int> v[MAX],frunze;

void dfs(int nod){
    vf[nod] = 1;
    bool ok = false;
    for(auto vecin: v[nod]){
        if(vf[vecin] == 0){
            ok |= true;
            dfs(vecin);
        }
    }
    if(!ok){
        frunze.push_back(nod);
    }
}

int main()
{
    cin >> n;
    for(int i = 1; i < n; i++){
        cin >> x >> y;
        v[x].push_back(y);
        v[y].push_back(x);
    }
    int rad = 1;
    for(int i = 1; i <= n; i++){
        if(v[i].size() > 1){
            rad = i;
            break;
        }
    }
    dfs(rad);
    if(frunze.size()%2 == 0){
        cout << frunze.size()/2 << "\n";
        for(int i = 0; i < frunze.size()/2; i++){
            cout << frunze[i] << " " << frunze[i + frunze.size()/2] << "\n";
        }
    }else{
        cout << (frunze.size()/2)+1 << "\n";
        for(int i = 0; i < frunze.size()/2; i++){
            cout << frunze[i] << " " << frunze[i + frunze.size()/2 + 1] << "\n";
        }
        cout << rad << " " << frunze[frunze.size()/2];
    }
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:41:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for(int i = 0; i < frunze.size()/2; i++){
      |                        ~~^~~~~~~~~~~~~~~~~
net.cpp:46:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         for(int i = 0; i < frunze.size()/2; i++){
      |                        ~~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 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 6 ms 11988 KB Output is correct
5 Correct 7 ms 11988 KB Output is correct
6 Correct 7 ms 11988 KB Output is correct
7 Correct 6 ms 11956 KB Output is correct
8 Correct 7 ms 12016 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 12052 KB Output is correct
11 Correct 6 ms 11960 KB Output is correct
12 Correct 7 ms 12036 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11988 KB Output is correct
15 Correct 7 ms 11988 KB Output is correct
16 Correct 6 ms 12056 KB Output is correct
17 Correct 6 ms 12048 KB Output is correct
18 Correct 7 ms 12052 KB Output is correct
19 Correct 7 ms 11988 KB Output is correct
20 Correct 7 ms 11988 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 6 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 6 ms 11988 KB Output is correct
5 Correct 7 ms 11988 KB Output is correct
6 Correct 7 ms 11988 KB Output is correct
7 Correct 6 ms 11956 KB Output is correct
8 Correct 7 ms 12016 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 12052 KB Output is correct
11 Correct 6 ms 11960 KB Output is correct
12 Correct 7 ms 12036 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11988 KB Output is correct
15 Correct 7 ms 11988 KB Output is correct
16 Correct 6 ms 12056 KB Output is correct
17 Correct 6 ms 12048 KB Output is correct
18 Correct 7 ms 12052 KB Output is correct
19 Correct 7 ms 11988 KB Output is correct
20 Correct 7 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct
22 Correct 8 ms 12116 KB Output is correct
23 Correct 8 ms 12116 KB Output is correct
24 Correct 8 ms 12144 KB Output is correct
25 Correct 8 ms 12064 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 8 ms 12116 KB Output is correct
28 Correct 8 ms 12064 KB Output is correct
29 Correct 8 ms 12132 KB Output is correct
30 Correct 7 ms 11988 KB Output is correct
31 Correct 8 ms 12116 KB Output is correct
32 Correct 6 ms 11988 KB Output is correct
33 Correct 7 ms 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 7 ms 11988 KB Output is correct
36 Correct 7 ms 11988 KB Output is correct
37 Correct 7 ms 11988 KB Output is correct
38 Correct 7 ms 12064 KB Output is correct
39 Correct 7 ms 11988 KB Output is correct
40 Correct 7 ms 12048 KB Output is correct
41 Correct 7 ms 11960 KB Output is correct
42 Correct 9 ms 11964 KB Output is correct
43 Correct 8 ms 12104 KB Output is correct
44 Correct 6 ms 11988 KB Output is correct
45 Correct 7 ms 12048 KB Output is correct
46 Correct 7 ms 12060 KB Output is correct
47 Correct 6 ms 11988 KB Output is correct
48 Correct 7 ms 12116 KB Output is correct
49 Correct 7 ms 12116 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 7 ms 11988 KB Output is correct
52 Correct 7 ms 11988 KB Output is correct
53 Correct 9 ms 12080 KB Output is correct
54 Correct 7 ms 12016 KB Output is correct
55 Correct 7 ms 12052 KB Output is correct
56 Correct 6 ms 12052 KB Output is correct
57 Correct 7 ms 11988 KB Output is correct
58 Correct 8 ms 12116 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 6 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 6 ms 11988 KB Output is correct
5 Correct 7 ms 11988 KB Output is correct
6 Correct 7 ms 11988 KB Output is correct
7 Correct 6 ms 11956 KB Output is correct
8 Correct 7 ms 12016 KB Output is correct
9 Correct 6 ms 11988 KB Output is correct
10 Correct 6 ms 12052 KB Output is correct
11 Correct 6 ms 11960 KB Output is correct
12 Correct 7 ms 12036 KB Output is correct
13 Correct 6 ms 11988 KB Output is correct
14 Correct 6 ms 11988 KB Output is correct
15 Correct 7 ms 11988 KB Output is correct
16 Correct 6 ms 12056 KB Output is correct
17 Correct 6 ms 12048 KB Output is correct
18 Correct 7 ms 12052 KB Output is correct
19 Correct 7 ms 11988 KB Output is correct
20 Correct 7 ms 11988 KB Output is correct
21 Correct 6 ms 11988 KB Output is correct
22 Correct 8 ms 12116 KB Output is correct
23 Correct 8 ms 12116 KB Output is correct
24 Correct 8 ms 12144 KB Output is correct
25 Correct 8 ms 12064 KB Output is correct
26 Correct 7 ms 12116 KB Output is correct
27 Correct 8 ms 12116 KB Output is correct
28 Correct 8 ms 12064 KB Output is correct
29 Correct 8 ms 12132 KB Output is correct
30 Correct 7 ms 11988 KB Output is correct
31 Correct 8 ms 12116 KB Output is correct
32 Correct 6 ms 11988 KB Output is correct
33 Correct 7 ms 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 7 ms 11988 KB Output is correct
36 Correct 7 ms 11988 KB Output is correct
37 Correct 7 ms 11988 KB Output is correct
38 Correct 7 ms 12064 KB Output is correct
39 Correct 7 ms 11988 KB Output is correct
40 Correct 7 ms 12048 KB Output is correct
41 Correct 7 ms 11960 KB Output is correct
42 Correct 9 ms 11964 KB Output is correct
43 Correct 8 ms 12104 KB Output is correct
44 Correct 6 ms 11988 KB Output is correct
45 Correct 7 ms 12048 KB Output is correct
46 Correct 7 ms 12060 KB Output is correct
47 Correct 6 ms 11988 KB Output is correct
48 Correct 7 ms 12116 KB Output is correct
49 Correct 7 ms 12116 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 7 ms 11988 KB Output is correct
52 Correct 7 ms 11988 KB Output is correct
53 Correct 9 ms 12080 KB Output is correct
54 Correct 7 ms 12016 KB Output is correct
55 Correct 7 ms 12052 KB Output is correct
56 Correct 6 ms 12052 KB Output is correct
57 Correct 7 ms 11988 KB Output is correct
58 Correct 8 ms 12116 KB Output is correct
59 Correct 467 ms 37680 KB Output is correct
60 Correct 566 ms 40644 KB Output is correct
61 Correct 7 ms 11988 KB Output is correct
62 Correct 8 ms 11988 KB Output is correct
63 Correct 422 ms 35092 KB Output is correct
64 Correct 10 ms 12532 KB Output is correct
65 Correct 24 ms 13924 KB Output is correct
66 Correct 188 ms 28592 KB Output is correct
67 Correct 625 ms 48984 KB Output is correct
68 Correct 621 ms 49668 KB Output is correct
69 Correct 22 ms 12896 KB Output is correct
70 Correct 150 ms 21892 KB Output is correct
71 Correct 494 ms 43804 KB Output is correct
72 Correct 493 ms 42604 KB Output is correct
73 Correct 153 ms 19520 KB Output is correct
74 Correct 597 ms 39516 KB Output is correct
75 Correct 47 ms 15436 KB Output is correct
76 Correct 473 ms 43408 KB Output is correct
77 Correct 444 ms 43508 KB Output is correct
78 Correct 48 ms 15744 KB Output is correct
79 Correct 608 ms 46988 KB Output is correct
80 Correct 9 ms 12244 KB Output is correct
81 Correct 156 ms 21932 KB Output is correct
82 Correct 503 ms 41588 KB Output is correct
83 Correct 558 ms 39624 KB Output is correct
84 Correct 555 ms 39544 KB Output is correct
85 Correct 575 ms 39708 KB Output is correct
86 Correct 581 ms 40728 KB Output is correct
87 Correct 552 ms 40720 KB Output is correct