Submission #821991

# Submission time Handle Problem Language Result Execution time Memory
821991 2023-08-12T00:42:10 Z exodus_ Network (BOI15_net) C++14
100 / 100
794 ms 47592 KB
#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
const int nmax = 500005;
vector<int>adj[nmax];
vector<int>leaf;
void DFS() {
    stack<pair<int,int>>st;
    st.push({1,0});
    while(!st.empty()) {
        int nod = st.top().fi;
        int par = st.top().se;
        st.pop();
        if(adj[nod].size()==1) leaf.push_back(nod);
        for(auto nxt:adj[nod]) {
            if(nxt != par) st.push({nxt,nod});
        }
    }

}
int main() {
    int n,a,b;
    cin >> n;
    for(int i=1; i<n; i++) {
        cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    DFS();
    int N = (leaf.size()+1)/2;
    cout << N << endl;
    for(int i=0; i<N; i++) {
        cout << leaf[i] << " " << leaf[i+(leaf.size()/2)] << endl;
    }
    return 0;
}
# Verdict Execution time Memory Grader output
1 Correct 8 ms 12116 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 8 ms 12032 KB Output is correct
5 Correct 5 ms 11988 KB Output is correct
6 Correct 5 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 12032 KB Output is correct
10 Correct 7 ms 11992 KB Output is correct
11 Correct 5 ms 11988 KB Output is correct
12 Correct 6 ms 11972 KB Output is correct
13 Correct 7 ms 12040 KB Output is correct
14 Correct 7 ms 12044 KB Output is correct
15 Correct 7 ms 12044 KB Output is correct
16 Correct 8 ms 11988 KB Output is correct
17 Correct 6 ms 11988 KB Output is correct
18 Correct 6 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 8 ms 11988 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 8 ms 12116 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 8 ms 12032 KB Output is correct
5 Correct 5 ms 11988 KB Output is correct
6 Correct 5 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 12032 KB Output is correct
10 Correct 7 ms 11992 KB Output is correct
11 Correct 5 ms 11988 KB Output is correct
12 Correct 6 ms 11972 KB Output is correct
13 Correct 7 ms 12040 KB Output is correct
14 Correct 7 ms 12044 KB Output is correct
15 Correct 7 ms 12044 KB Output is correct
16 Correct 8 ms 11988 KB Output is correct
17 Correct 6 ms 11988 KB Output is correct
18 Correct 6 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 8 ms 11988 KB Output is correct
21 Correct 8 ms 11988 KB Output is correct
22 Correct 11 ms 12116 KB Output is correct
23 Correct 10 ms 12052 KB Output is correct
24 Correct 11 ms 12052 KB Output is correct
25 Correct 10 ms 12060 KB Output is correct
26 Correct 8 ms 12048 KB Output is correct
27 Correct 8 ms 12060 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 8 ms 12060 KB Output is correct
30 Correct 6 ms 11988 KB Output is correct
31 Correct 8 ms 12116 KB Output is correct
32 Correct 6 ms 12036 KB Output is correct
33 Correct 6 ms 11988 KB Output is correct
34 Correct 7 ms 12072 KB Output is correct
35 Correct 6 ms 12044 KB Output is correct
36 Correct 6 ms 11996 KB Output is correct
37 Correct 7 ms 12048 KB Output is correct
38 Correct 7 ms 11988 KB Output is correct
39 Correct 6 ms 11988 KB Output is correct
40 Correct 7 ms 11988 KB Output is correct
41 Correct 6 ms 11944 KB Output is correct
42 Correct 6 ms 11988 KB Output is correct
43 Correct 6 ms 11988 KB Output is correct
44 Correct 7 ms 11988 KB Output is correct
45 Correct 6 ms 12044 KB Output is correct
46 Correct 7 ms 12052 KB Output is correct
47 Correct 6 ms 11988 KB Output is correct
48 Correct 7 ms 11988 KB Output is correct
49 Correct 7 ms 11988 KB Output is correct
50 Correct 6 ms 11988 KB Output is correct
51 Correct 8 ms 11988 KB Output is correct
52 Correct 8 ms 12040 KB Output is correct
53 Correct 6 ms 11988 KB Output is correct
54 Correct 6 ms 12032 KB Output is correct
55 Correct 7 ms 12116 KB Output is correct
56 Correct 7 ms 11988 KB Output is correct
57 Correct 9 ms 12156 KB Output is correct
58 Correct 10 ms 12056 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 8 ms 12116 KB Output is correct
2 Correct 7 ms 11988 KB Output is correct
3 Correct 6 ms 11988 KB Output is correct
4 Correct 8 ms 12032 KB Output is correct
5 Correct 5 ms 11988 KB Output is correct
6 Correct 5 ms 11988 KB Output is correct
7 Correct 6 ms 11988 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 12032 KB Output is correct
10 Correct 7 ms 11992 KB Output is correct
11 Correct 5 ms 11988 KB Output is correct
12 Correct 6 ms 11972 KB Output is correct
13 Correct 7 ms 12040 KB Output is correct
14 Correct 7 ms 12044 KB Output is correct
15 Correct 7 ms 12044 KB Output is correct
16 Correct 8 ms 11988 KB Output is correct
17 Correct 6 ms 11988 KB Output is correct
18 Correct 6 ms 11988 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 8 ms 11988 KB Output is correct
21 Correct 8 ms 11988 KB Output is correct
22 Correct 11 ms 12116 KB Output is correct
23 Correct 10 ms 12052 KB Output is correct
24 Correct 11 ms 12052 KB Output is correct
25 Correct 10 ms 12060 KB Output is correct
26 Correct 8 ms 12048 KB Output is correct
27 Correct 8 ms 12060 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 8 ms 12060 KB Output is correct
30 Correct 6 ms 11988 KB Output is correct
31 Correct 8 ms 12116 KB Output is correct
32 Correct 6 ms 12036 KB Output is correct
33 Correct 6 ms 11988 KB Output is correct
34 Correct 7 ms 12072 KB Output is correct
35 Correct 6 ms 12044 KB Output is correct
36 Correct 6 ms 11996 KB Output is correct
37 Correct 7 ms 12048 KB Output is correct
38 Correct 7 ms 11988 KB Output is correct
39 Correct 6 ms 11988 KB Output is correct
40 Correct 7 ms 11988 KB Output is correct
41 Correct 6 ms 11944 KB Output is correct
42 Correct 6 ms 11988 KB Output is correct
43 Correct 6 ms 11988 KB Output is correct
44 Correct 7 ms 11988 KB Output is correct
45 Correct 6 ms 12044 KB Output is correct
46 Correct 7 ms 12052 KB Output is correct
47 Correct 6 ms 11988 KB Output is correct
48 Correct 7 ms 11988 KB Output is correct
49 Correct 7 ms 11988 KB Output is correct
50 Correct 6 ms 11988 KB Output is correct
51 Correct 8 ms 11988 KB Output is correct
52 Correct 8 ms 12040 KB Output is correct
53 Correct 6 ms 11988 KB Output is correct
54 Correct 6 ms 12032 KB Output is correct
55 Correct 7 ms 12116 KB Output is correct
56 Correct 7 ms 11988 KB Output is correct
57 Correct 9 ms 12156 KB Output is correct
58 Correct 10 ms 12056 KB Output is correct
59 Correct 555 ms 37216 KB Output is correct
60 Correct 721 ms 38724 KB Output is correct
61 Correct 6 ms 12040 KB Output is correct
62 Correct 6 ms 11988 KB Output is correct
63 Correct 516 ms 34312 KB Output is correct
64 Correct 8 ms 12244 KB Output is correct
65 Correct 20 ms 13012 KB Output is correct
66 Correct 175 ms 20008 KB Output is correct
67 Correct 579 ms 34192 KB Output is correct
68 Correct 621 ms 34900 KB Output is correct
69 Correct 22 ms 13008 KB Output is correct
70 Correct 219 ms 22352 KB Output is correct
71 Correct 786 ms 47592 KB Output is correct
72 Correct 701 ms 44268 KB Output is correct
73 Correct 186 ms 18964 KB Output is correct
74 Correct 794 ms 37576 KB Output is correct
75 Correct 76 ms 15588 KB Output is correct
76 Correct 721 ms 45200 KB Output is correct
77 Correct 716 ms 45164 KB Output is correct
78 Correct 51 ms 14592 KB Output is correct
79 Correct 515 ms 34312 KB Output is correct
80 Correct 11 ms 12244 KB Output is correct
81 Correct 232 ms 22244 KB Output is correct
82 Correct 704 ms 42124 KB Output is correct
83 Correct 651 ms 37576 KB Output is correct
84 Correct 643 ms 37692 KB Output is correct
85 Correct 696 ms 37608 KB Output is correct
86 Correct 743 ms 38696 KB Output is correct
87 Correct 678 ms 38704 KB Output is correct