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Submission #499900

# Submission time Handle Problem Language Result Execution time Memory
499900 2021-12-29T23:15:43 Z SirCovidThe19th Network (BOI15_net) C++17
100 / 100
 642 ms 47716 KB 
#include <bits/stdc++.h>
using namespace std; 

int n; vector<int> adj[500005], leaf;

void dfs(int cur, int p){
    if (adj[cur].size() == 1) leaf.push_back(cur);
    for (int nxt : adj[cur]) if (nxt != p) dfs(nxt, cur);
}

int main(){
    cin >> n;
    for (int i = 1; i < n; i++){
        int a, b; cin >> a >> b;
        adj[a].push_back(b); adj[b].push_back(a);
    }
    dfs(1, 0);
    int sz = leaf.size();
    cout<<(sz + 1) / 2<<"\n";
    for (int i = 0; i + sz / 2 < sz; i++) cout<<leaf[i]<<" "<<leaf[i + sz / 2]<<"\n";
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 6 ms 12004 KB Output is correct
3 Correct 6 ms 12040 KB Output is correct
4 Correct 7 ms 12036 KB Output is correct
5 Correct 7 ms 12016 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12036 KB Output is correct
8 Correct 6 ms 12036 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 6 ms 11980 KB Output is correct
11 Correct 7 ms 12036 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 6 ms 11980 KB Output is correct
14 Correct 6 ms 12036 KB Output is correct
15 Correct 7 ms 12032 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 8 ms 12032 KB Output is correct
19 Correct 6 ms 12036 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 6 ms 12004 KB Output is correct
3 Correct 6 ms 12040 KB Output is correct
4 Correct 7 ms 12036 KB Output is correct
5 Correct 7 ms 12016 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12036 KB Output is correct
8 Correct 6 ms 12036 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 6 ms 11980 KB Output is correct
11 Correct 7 ms 12036 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 6 ms 11980 KB Output is correct
14 Correct 6 ms 12036 KB Output is correct
15 Correct 7 ms 12032 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 8 ms 12032 KB Output is correct
19 Correct 6 ms 12036 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct
21 Correct 6 ms 11980 KB Output is correct
22 Correct 7 ms 12048 KB Output is correct
23 Correct 7 ms 12108 KB Output is correct
24 Correct 8 ms 12052 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 6 ms 12108 KB Output is correct
27 Correct 7 ms 12048 KB Output is correct
28 Correct 7 ms 12108 KB Output is correct
29 Correct 8 ms 12008 KB Output is correct
30 Correct 8 ms 11980 KB Output is correct
31 Correct 8 ms 12108 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 6 ms 12036 KB Output is correct
34 Correct 6 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 6 ms 11980 KB Output is correct
37 Correct 7 ms 11980 KB Output is correct
38 Correct 7 ms 12108 KB Output is correct
39 Correct 7 ms 12036 KB Output is correct
40 Correct 6 ms 11980 KB Output is correct
41 Correct 6 ms 11980 KB Output is correct
42 Correct 6 ms 11980 KB Output is correct
43 Correct 6 ms 11968 KB Output is correct
44 Correct 6 ms 12032 KB Output is correct
45 Correct 6 ms 12036 KB Output is correct
46 Correct 7 ms 11980 KB Output is correct
47 Correct 8 ms 11980 KB Output is correct
48 Correct 6 ms 11980 KB Output is correct
49 Correct 6 ms 12044 KB Output is correct
50 Correct 6 ms 11980 KB Output is correct
51 Correct 6 ms 11980 KB Output is correct
52 Correct 6 ms 11980 KB Output is correct
53 Correct 7 ms 12036 KB Output is correct
54 Correct 6 ms 11980 KB Output is correct
55 Correct 6 ms 11980 KB Output is correct
56 Correct 6 ms 12036 KB Output is correct
57 Correct 6 ms 11980 KB Output is correct
58 Correct 7 ms 12108 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 11980 KB Output is correct
2 Correct 6 ms 12004 KB Output is correct
3 Correct 6 ms 12040 KB Output is correct
4 Correct 7 ms 12036 KB Output is correct
5 Correct 7 ms 12016 KB Output is correct
6 Correct 6 ms 11980 KB Output is correct
7 Correct 6 ms 12036 KB Output is correct
8 Correct 6 ms 12036 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 6 ms 11980 KB Output is correct
11 Correct 7 ms 12036 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 6 ms 11980 KB Output is correct
14 Correct 6 ms 12036 KB Output is correct
15 Correct 7 ms 12032 KB Output is correct
16 Correct 6 ms 11980 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 8 ms 12032 KB Output is correct
19 Correct 6 ms 12036 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct
21 Correct 6 ms 11980 KB Output is correct
22 Correct 7 ms 12048 KB Output is correct
23 Correct 7 ms 12108 KB Output is correct
24 Correct 8 ms 12052 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 6 ms 12108 KB Output is correct
27 Correct 7 ms 12048 KB Output is correct
28 Correct 7 ms 12108 KB Output is correct
29 Correct 8 ms 12008 KB Output is correct
30 Correct 8 ms 11980 KB Output is correct
31 Correct 8 ms 12108 KB Output is correct
32 Correct 6 ms 11980 KB Output is correct
33 Correct 6 ms 12036 KB Output is correct
34 Correct 6 ms 11980 KB Output is correct
35 Correct 6 ms 11980 KB Output is correct
36 Correct 6 ms 11980 KB Output is correct
37 Correct 7 ms 11980 KB Output is correct
38 Correct 7 ms 12108 KB Output is correct
39 Correct 7 ms 12036 KB Output is correct
40 Correct 6 ms 11980 KB Output is correct
41 Correct 6 ms 11980 KB Output is correct
42 Correct 6 ms 11980 KB Output is correct
43 Correct 6 ms 11968 KB Output is correct
44 Correct 6 ms 12032 KB Output is correct
45 Correct 6 ms 12036 KB Output is correct
46 Correct 7 ms 11980 KB Output is correct
47 Correct 8 ms 11980 KB Output is correct
48 Correct 6 ms 11980 KB Output is correct
49 Correct 6 ms 12044 KB Output is correct
50 Correct 6 ms 11980 KB Output is correct
51 Correct 6 ms 11980 KB Output is correct
52 Correct 6 ms 11980 KB Output is correct
53 Correct 7 ms 12036 KB Output is correct
54 Correct 6 ms 11980 KB Output is correct
55 Correct 6 ms 11980 KB Output is correct
56 Correct 6 ms 12036 KB Output is correct
57 Correct 6 ms 11980 KB Output is correct
58 Correct 7 ms 12108 KB Output is correct
59 Correct 487 ms 35996 KB Output is correct
60 Correct 568 ms 38724 KB Output is correct
61 Correct 6 ms 11980 KB Output is correct
62 Correct 6 ms 11980 KB Output is correct
63 Correct 404 ms 33536 KB Output is correct
64 Correct 9 ms 12428 KB Output is correct
65 Correct 23 ms 13772 KB Output is correct
66 Correct 196 ms 27928 KB Output is correct
67 Correct 642 ms 46916 KB Output is correct
68 Correct 603 ms 47716 KB Output is correct
69 Correct 16 ms 12804 KB Output is correct
70 Correct 150 ms 21200 KB Output is correct
71 Correct 450 ms 41824 KB Output is correct
72 Correct 445 ms 40628 KB Output is correct
73 Correct 118 ms 19028 KB Output is correct
74 Correct 547 ms 37768 KB Output is correct
75 Correct 62 ms 15236 KB Output is correct
76 Correct 506 ms 41500 KB Output is correct
77 Correct 429 ms 41628 KB Output is correct
78 Correct 49 ms 15296 KB Output is correct
79 Correct 589 ms 45068 KB Output is correct
80 Correct 8 ms 12164 KB Output is correct
81 Correct 140 ms 21248 KB Output is correct
82 Correct 518 ms 39604 KB Output is correct
83 Correct 535 ms 37640 KB Output is correct
84 Correct 536 ms 37576 KB Output is correct
85 Correct 549 ms 37644 KB Output is correct
86 Correct 587 ms 38724 KB Output is correct
87 Correct 583 ms 38644 KB Output is correct