# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
655925 |
2022-11-06T05:51:00 Z |
Behradm |
Network (BOI15_net) |
C++17 |
|
412 ms |
40812 KB |
/*\ In The Name Of GOD
* Beyrad :D
\*/
#include "bits/stdc++.h"
#define sz(x) ((int) (x).size())
using namespace std;
const int N = 5e5 + 11;
int st[N];
int T = 0;
vector<int> g[N];
void dfs(int u, int p) {
st[u] = T++;
for (int v : g[u]) {
if (v != p)
dfs(v, u);
}
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0), cout.tie(0);
int n;
cin >> n;
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v;
--u, --v;
g[u].push_back(v);
g[v].push_back(u);
}
int rt = 0;
for (int i = 0; i < n; i++)
if (sz(g[i]) >= 2)
rt = i;
dfs(rt, -1);
vector<pair<int, int>> a;
for (int i = 0; i < n; i++)
if (sz(g[i]) == 1)
a.emplace_back(st[i], i);
sort(a.begin(), a.end());
int k = sz(a);
cout << (k + 1) / 2 << '\n';
for (int i = 0; i < k / 2; i++)
cout << a[i].second + 1 << " " << a[i + (k + 1) / 2].second + 1 << '\n';
if (k % 2 == 1)
cout << a[k / 2].second + 1 << " " << rt + 1 << '\n';
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
11988 KB |
Output is correct |
2 |
Correct |
7 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 |
6 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 |
11988 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
6 ms |
11964 KB |
Output is correct |
12 |
Correct |
6 ms |
12020 KB |
Output is correct |
13 |
Correct |
8 ms |
11988 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
8 ms |
11988 KB |
Output is correct |
16 |
Correct |
8 ms |
12008 KB |
Output is correct |
17 |
Correct |
7 ms |
11988 KB |
Output is correct |
18 |
Correct |
6 ms |
12068 KB |
Output is correct |
19 |
Correct |
6 ms |
11988 KB |
Output is correct |
20 |
Correct |
6 ms |
11988 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
11988 KB |
Output is correct |
2 |
Correct |
7 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 |
6 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 |
11988 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
6 ms |
11964 KB |
Output is correct |
12 |
Correct |
6 ms |
12020 KB |
Output is correct |
13 |
Correct |
8 ms |
11988 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
8 ms |
11988 KB |
Output is correct |
16 |
Correct |
8 ms |
12008 KB |
Output is correct |
17 |
Correct |
7 ms |
11988 KB |
Output is correct |
18 |
Correct |
6 ms |
12068 KB |
Output is correct |
19 |
Correct |
6 ms |
11988 KB |
Output is correct |
20 |
Correct |
6 ms |
11988 KB |
Output is correct |
21 |
Correct |
7 ms |
11988 KB |
Output is correct |
22 |
Correct |
7 ms |
12116 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
7 ms |
12116 KB |
Output is correct |
25 |
Correct |
6 ms |
12116 KB |
Output is correct |
26 |
Correct |
6 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12184 KB |
Output is correct |
28 |
Correct |
8 ms |
12116 KB |
Output is correct |
29 |
Correct |
7 ms |
12116 KB |
Output is correct |
30 |
Correct |
6 ms |
11988 KB |
Output is correct |
31 |
Correct |
7 ms |
12180 KB |
Output is correct |
32 |
Correct |
6 ms |
11988 KB |
Output is correct |
33 |
Correct |
12 ms |
11944 KB |
Output is correct |
34 |
Correct |
6 ms |
11988 KB |
Output is correct |
35 |
Correct |
8 ms |
12064 KB |
Output is correct |
36 |
Correct |
6 ms |
11988 KB |
Output is correct |
37 |
Correct |
6 ms |
11988 KB |
Output is correct |
38 |
Correct |
8 ms |
12116 KB |
Output is correct |
39 |
Correct |
6 ms |
11988 KB |
Output is correct |
40 |
Correct |
7 ms |
11972 KB |
Output is correct |
41 |
Correct |
7 ms |
12116 KB |
Output is correct |
42 |
Correct |
6 ms |
11988 KB |
Output is correct |
43 |
Correct |
10 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 |
9 ms |
12116 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 |
12116 KB |
Output is correct |
50 |
Correct |
6 ms |
11988 KB |
Output is correct |
51 |
Correct |
7 ms |
11988 KB |
Output is correct |
52 |
Correct |
14 ms |
12052 KB |
Output is correct |
53 |
Correct |
7 ms |
12072 KB |
Output is correct |
54 |
Correct |
7 ms |
11944 KB |
Output is correct |
55 |
Correct |
7 ms |
11988 KB |
Output is correct |
56 |
Correct |
7 ms |
12068 KB |
Output is correct |
57 |
Correct |
7 ms |
12012 KB |
Output is correct |
58 |
Correct |
7 ms |
12200 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
8 ms |
11988 KB |
Output is correct |
2 |
Correct |
7 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 |
6 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 |
11988 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
6 ms |
11964 KB |
Output is correct |
12 |
Correct |
6 ms |
12020 KB |
Output is correct |
13 |
Correct |
8 ms |
11988 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
8 ms |
11988 KB |
Output is correct |
16 |
Correct |
8 ms |
12008 KB |
Output is correct |
17 |
Correct |
7 ms |
11988 KB |
Output is correct |
18 |
Correct |
6 ms |
12068 KB |
Output is correct |
19 |
Correct |
6 ms |
11988 KB |
Output is correct |
20 |
Correct |
6 ms |
11988 KB |
Output is correct |
21 |
Correct |
7 ms |
11988 KB |
Output is correct |
22 |
Correct |
7 ms |
12116 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
7 ms |
12116 KB |
Output is correct |
25 |
Correct |
6 ms |
12116 KB |
Output is correct |
26 |
Correct |
6 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12184 KB |
Output is correct |
28 |
Correct |
8 ms |
12116 KB |
Output is correct |
29 |
Correct |
7 ms |
12116 KB |
Output is correct |
30 |
Correct |
6 ms |
11988 KB |
Output is correct |
31 |
Correct |
7 ms |
12180 KB |
Output is correct |
32 |
Correct |
6 ms |
11988 KB |
Output is correct |
33 |
Correct |
12 ms |
11944 KB |
Output is correct |
34 |
Correct |
6 ms |
11988 KB |
Output is correct |
35 |
Correct |
8 ms |
12064 KB |
Output is correct |
36 |
Correct |
6 ms |
11988 KB |
Output is correct |
37 |
Correct |
6 ms |
11988 KB |
Output is correct |
38 |
Correct |
8 ms |
12116 KB |
Output is correct |
39 |
Correct |
6 ms |
11988 KB |
Output is correct |
40 |
Correct |
7 ms |
11972 KB |
Output is correct |
41 |
Correct |
7 ms |
12116 KB |
Output is correct |
42 |
Correct |
6 ms |
11988 KB |
Output is correct |
43 |
Correct |
10 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 |
9 ms |
12116 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 |
12116 KB |
Output is correct |
50 |
Correct |
6 ms |
11988 KB |
Output is correct |
51 |
Correct |
7 ms |
11988 KB |
Output is correct |
52 |
Correct |
14 ms |
12052 KB |
Output is correct |
53 |
Correct |
7 ms |
12072 KB |
Output is correct |
54 |
Correct |
7 ms |
11944 KB |
Output is correct |
55 |
Correct |
7 ms |
11988 KB |
Output is correct |
56 |
Correct |
7 ms |
12068 KB |
Output is correct |
57 |
Correct |
7 ms |
12012 KB |
Output is correct |
58 |
Correct |
7 ms |
12200 KB |
Output is correct |
59 |
Correct |
314 ms |
32908 KB |
Output is correct |
60 |
Correct |
386 ms |
35396 KB |
Output is correct |
61 |
Correct |
7 ms |
12040 KB |
Output is correct |
62 |
Correct |
6 ms |
11988 KB |
Output is correct |
63 |
Correct |
294 ms |
30976 KB |
Output is correct |
64 |
Correct |
8 ms |
12244 KB |
Output is correct |
65 |
Correct |
17 ms |
13268 KB |
Output is correct |
66 |
Correct |
104 ms |
20836 KB |
Output is correct |
67 |
Correct |
398 ms |
40812 KB |
Output is correct |
68 |
Correct |
412 ms |
37940 KB |
Output is correct |
69 |
Correct |
13 ms |
12884 KB |
Output is correct |
70 |
Correct |
77 ms |
20440 KB |
Output is correct |
71 |
Correct |
296 ms |
39000 KB |
Output is correct |
72 |
Correct |
312 ms |
38156 KB |
Output is correct |
73 |
Correct |
80 ms |
18240 KB |
Output is correct |
74 |
Correct |
384 ms |
33908 KB |
Output is correct |
75 |
Correct |
35 ms |
15056 KB |
Output is correct |
76 |
Correct |
288 ms |
38648 KB |
Output is correct |
77 |
Correct |
297 ms |
39012 KB |
Output is correct |
78 |
Correct |
26 ms |
14676 KB |
Output is correct |
79 |
Correct |
393 ms |
34716 KB |
Output is correct |
80 |
Correct |
8 ms |
12244 KB |
Output is correct |
81 |
Correct |
106 ms |
20344 KB |
Output is correct |
82 |
Correct |
328 ms |
36468 KB |
Output is correct |
83 |
Correct |
380 ms |
33896 KB |
Output is correct |
84 |
Correct |
376 ms |
34012 KB |
Output is correct |
85 |
Correct |
389 ms |
34008 KB |
Output is correct |
86 |
Correct |
379 ms |
35400 KB |
Output is correct |
87 |
Correct |
380 ms |
35388 KB |
Output is correct |