| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 79683 |
2018-10-15T11:48:50 Z |
EntityIT |
Network (BOI15_net) |
C++14 |
|
737 ms |
42312 KB |
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
typedef pair<int, int> ii;
const int N = 5e5 + 5;
int n, nLeaf;
vector<int> gr[N], vec;
void dfs (int u, int p) {
for (int v : gr[u]) if (v != p) dfs(v, u);
if (gr[u].size() == 1) vec.pb(u);
}
int main () {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
for (int _ = 1; _ < n; ++_) {
int u, v; cin >> u >> v;
gr[u].pb(v); gr[v].pb(u);
}
for (int u = 1; u <= n; ++u) nLeaf += (gr[u].size() == 1);
cout << (nLeaf + 1) / 2 << '\n';
for (int u = 1; u <= n; ++u) if (gr[u].size() > 1) {
dfs(u, u);
break ;
}
for (int i = 0; i < vec.size() - (nLeaf + 1) / 2; ++i) cout << vec[i] << ' ' << vec[i + (nLeaf + 1) / 2] << '\n';
if (nLeaf % 2) cout << vec[0] << ' ' << vec[nLeaf / 2];
return 0;
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < vec.size() - (nLeaf + 1) / 2; ++i) cout << vec[i] << ' ' << vec[i + (nLeaf + 1) / 2] << '\n';
~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
15 ms |
12276 KB |
Output is correct |
| 3 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 4 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 6 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 9 |
Correct |
16 ms |
12420 KB |
Output is correct |
| 10 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 13 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 19 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 20 |
Correct |
16 ms |
12420 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
15 ms |
12276 KB |
Output is correct |
| 3 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 4 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 6 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 9 |
Correct |
16 ms |
12420 KB |
Output is correct |
| 10 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 13 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 19 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 20 |
Correct |
16 ms |
12420 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12488 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12508 KB |
Output is correct |
| 24 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12600 KB |
Output is correct |
| 26 |
Correct |
17 ms |
12600 KB |
Output is correct |
| 27 |
Correct |
13 ms |
12600 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12628 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12664 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12664 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12684 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12724 KB |
Output is correct |
| 38 |
Correct |
14 ms |
12732 KB |
Output is correct |
| 39 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 40 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 41 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 42 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12752 KB |
Output is correct |
| 44 |
Correct |
14 ms |
12752 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12752 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12768 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12768 KB |
Output is correct |
| 48 |
Correct |
13 ms |
12768 KB |
Output is correct |
| 49 |
Correct |
13 ms |
12784 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12784 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12784 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12784 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 57 |
Correct |
12 ms |
12828 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12832 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
15 ms |
12276 KB |
Output is correct |
| 3 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 4 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 6 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 9 |
Correct |
16 ms |
12420 KB |
Output is correct |
| 10 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 13 |
Correct |
15 ms |
12420 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 19 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 20 |
Correct |
16 ms |
12420 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12488 KB |
Output is correct |
| 23 |
Correct |
13 ms |
12508 KB |
Output is correct |
| 24 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12600 KB |
Output is correct |
| 26 |
Correct |
17 ms |
12600 KB |
Output is correct |
| 27 |
Correct |
13 ms |
12600 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12628 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12664 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12664 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12684 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12684 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12724 KB |
Output is correct |
| 38 |
Correct |
14 ms |
12732 KB |
Output is correct |
| 39 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 40 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 41 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 42 |
Correct |
13 ms |
12732 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12752 KB |
Output is correct |
| 44 |
Correct |
14 ms |
12752 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12752 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12768 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12768 KB |
Output is correct |
| 48 |
Correct |
13 ms |
12768 KB |
Output is correct |
| 49 |
Correct |
13 ms |
12784 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12784 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12784 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12784 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12808 KB |
Output is correct |
| 57 |
Correct |
12 ms |
12828 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12832 KB |
Output is correct |
| 59 |
Correct |
466 ms |
31236 KB |
Output is correct |
| 60 |
Correct |
583 ms |
33324 KB |
Output is correct |
| 61 |
Correct |
12 ms |
33324 KB |
Output is correct |
| 62 |
Correct |
12 ms |
33324 KB |
Output is correct |
| 63 |
Correct |
378 ms |
33324 KB |
Output is correct |
| 64 |
Correct |
15 ms |
33324 KB |
Output is correct |
| 65 |
Correct |
36 ms |
33324 KB |
Output is correct |
| 66 |
Correct |
223 ms |
33324 KB |
Output is correct |
| 67 |
Correct |
629 ms |
41404 KB |
Output is correct |
| 68 |
Correct |
737 ms |
42312 KB |
Output is correct |
| 69 |
Correct |
24 ms |
42312 KB |
Output is correct |
| 70 |
Correct |
113 ms |
42312 KB |
Output is correct |
| 71 |
Correct |
358 ms |
42312 KB |
Output is correct |
| 72 |
Correct |
656 ms |
42312 KB |
Output is correct |
| 73 |
Correct |
109 ms |
42312 KB |
Output is correct |
| 74 |
Correct |
568 ms |
42312 KB |
Output is correct |
| 75 |
Correct |
52 ms |
42312 KB |
Output is correct |
| 76 |
Correct |
363 ms |
42312 KB |
Output is correct |
| 77 |
Correct |
368 ms |
42312 KB |
Output is correct |
| 78 |
Correct |
41 ms |
42312 KB |
Output is correct |
| 79 |
Correct |
636 ms |
42312 KB |
Output is correct |
| 80 |
Correct |
14 ms |
42312 KB |
Output is correct |
| 81 |
Correct |
120 ms |
42312 KB |
Output is correct |
| 82 |
Correct |
542 ms |
42312 KB |
Output is correct |
| 83 |
Correct |
520 ms |
42312 KB |
Output is correct |
| 84 |
Correct |
541 ms |
42312 KB |
Output is correct |
| 85 |
Correct |
538 ms |
42312 KB |
Output is correct |
| 86 |
Correct |
503 ms |
42312 KB |
Output is correct |
| 87 |
Correct |
528 ms |
42312 KB |
Output is correct |
