| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 793650 |
2023-07-26T05:05:43 Z |
rk42745417 |
Network (BOI15_net) |
C++17 |
|
379 ms |
58692 KB |
#include <bits/stdc++.h>
using namespace std;
#define EMiliaMyWife ios::sync_with_stdio(0); cin.tie(0);
using ll = int64_t;
using ull = uint64_t;
using uint = uint32_t;
using ld = long double;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
const ll LINF = ll(2e18) + ll(1e15);
const double EPS = 1e-8;
static auto LamyIsCute = []() {
EMiliaMyWife
return 48763;
}();
signed main() {
int n;
cin >> n;
vector<vector<int>> edge(n + 1);
for(int i = 1; i < n; i++) {
int u, v;
cin >> u >> v;
edge[u].push_back(v);
edge[v].push_back(u);
}
vector<int> tim(n + 1);
int t = 1;
function<void(int, int)> dfs = [&](int u, int p) {
tim[u] = t++;
for(int v : edge[u])
if(v != p)
dfs(v, u);
};
for(int i = 1; i <= n; i++)
if(!tim[i])
dfs(i, i);
vector<pair<int, int>> owo, ans;
for(int i = 1; i <= n; i++)
if(edge[i].size() == 1)
owo.push_back({tim[i], i});
sort(owo.begin(), owo.end());
for(int i = 0; i < owo.size() / 2; i++)
ans.push_back({owo[i].second, owo[i + owo.size() / 2].second});
if(owo.size() & 1)
ans.push_back({owo[owo.size() / 2].second, owo.back().second});
cout << ans.size() << '\n';
for(const auto &[a, b] : ans)
cout << a << ' ' << b << '\n';
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for(int i = 0; i < owo.size() / 2; i++)
| ~~^~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
320 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
320 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
212 KB |
Output is correct |
| 22 |
Correct |
1 ms |
468 KB |
Output is correct |
| 23 |
Correct |
1 ms |
468 KB |
Output is correct |
| 24 |
Correct |
1 ms |
468 KB |
Output is correct |
| 25 |
Correct |
1 ms |
468 KB |
Output is correct |
| 26 |
Correct |
1 ms |
340 KB |
Output is correct |
| 27 |
Correct |
1 ms |
468 KB |
Output is correct |
| 28 |
Correct |
1 ms |
468 KB |
Output is correct |
| 29 |
Correct |
1 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
468 KB |
Output is correct |
| 32 |
Correct |
0 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
0 ms |
212 KB |
Output is correct |
| 35 |
Correct |
0 ms |
212 KB |
Output is correct |
| 36 |
Correct |
0 ms |
212 KB |
Output is correct |
| 37 |
Correct |
0 ms |
340 KB |
Output is correct |
| 38 |
Correct |
1 ms |
340 KB |
Output is correct |
| 39 |
Correct |
0 ms |
212 KB |
Output is correct |
| 40 |
Correct |
0 ms |
212 KB |
Output is correct |
| 41 |
Correct |
1 ms |
212 KB |
Output is correct |
| 42 |
Correct |
1 ms |
320 KB |
Output is correct |
| 43 |
Correct |
1 ms |
328 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
1 ms |
340 KB |
Output is correct |
| 46 |
Correct |
1 ms |
340 KB |
Output is correct |
| 47 |
Correct |
1 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
340 KB |
Output is correct |
| 49 |
Correct |
1 ms |
328 KB |
Output is correct |
| 50 |
Correct |
0 ms |
212 KB |
Output is correct |
| 51 |
Correct |
0 ms |
212 KB |
Output is correct |
| 52 |
Correct |
1 ms |
340 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
0 ms |
212 KB |
Output is correct |
| 55 |
Correct |
1 ms |
340 KB |
Output is correct |
| 56 |
Correct |
1 ms |
212 KB |
Output is correct |
| 57 |
Correct |
1 ms |
328 KB |
Output is correct |
| 58 |
Correct |
1 ms |
468 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
212 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
320 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
212 KB |
Output is correct |
| 22 |
Correct |
1 ms |
468 KB |
Output is correct |
| 23 |
Correct |
1 ms |
468 KB |
Output is correct |
| 24 |
Correct |
1 ms |
468 KB |
Output is correct |
| 25 |
Correct |
1 ms |
468 KB |
Output is correct |
| 26 |
Correct |
1 ms |
340 KB |
Output is correct |
| 27 |
Correct |
1 ms |
468 KB |
Output is correct |
| 28 |
Correct |
1 ms |
468 KB |
Output is correct |
| 29 |
Correct |
1 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
468 KB |
Output is correct |
| 32 |
Correct |
0 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
0 ms |
212 KB |
Output is correct |
| 35 |
Correct |
0 ms |
212 KB |
Output is correct |
| 36 |
Correct |
0 ms |
212 KB |
Output is correct |
| 37 |
Correct |
0 ms |
340 KB |
Output is correct |
| 38 |
Correct |
1 ms |
340 KB |
Output is correct |
| 39 |
Correct |
0 ms |
212 KB |
Output is correct |
| 40 |
Correct |
0 ms |
212 KB |
Output is correct |
| 41 |
Correct |
1 ms |
212 KB |
Output is correct |
| 42 |
Correct |
1 ms |
320 KB |
Output is correct |
| 43 |
Correct |
1 ms |
328 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
1 ms |
340 KB |
Output is correct |
| 46 |
Correct |
1 ms |
340 KB |
Output is correct |
| 47 |
Correct |
1 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
340 KB |
Output is correct |
| 49 |
Correct |
1 ms |
328 KB |
Output is correct |
| 50 |
Correct |
0 ms |
212 KB |
Output is correct |
| 51 |
Correct |
0 ms |
212 KB |
Output is correct |
| 52 |
Correct |
1 ms |
340 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
0 ms |
212 KB |
Output is correct |
| 55 |
Correct |
1 ms |
340 KB |
Output is correct |
| 56 |
Correct |
1 ms |
212 KB |
Output is correct |
| 57 |
Correct |
1 ms |
328 KB |
Output is correct |
| 58 |
Correct |
1 ms |
468 KB |
Output is correct |
| 59 |
Correct |
288 ms |
40864 KB |
Output is correct |
| 60 |
Correct |
317 ms |
45192 KB |
Output is correct |
| 61 |
Correct |
1 ms |
212 KB |
Output is correct |
| 62 |
Correct |
1 ms |
212 KB |
Output is correct |
| 63 |
Correct |
211 ms |
37056 KB |
Output is correct |
| 64 |
Correct |
2 ms |
980 KB |
Output is correct |
| 65 |
Correct |
7 ms |
3412 KB |
Output is correct |
| 66 |
Correct |
79 ms |
26424 KB |
Output is correct |
| 67 |
Correct |
372 ms |
57272 KB |
Output is correct |
| 68 |
Correct |
379 ms |
58692 KB |
Output is correct |
| 69 |
Correct |
5 ms |
1620 KB |
Output is correct |
| 70 |
Correct |
72 ms |
15848 KB |
Output is correct |
| 71 |
Correct |
240 ms |
49676 KB |
Output is correct |
| 72 |
Correct |
254 ms |
48184 KB |
Output is correct |
| 73 |
Correct |
49 ms |
12084 KB |
Output is correct |
| 74 |
Correct |
347 ms |
42516 KB |
Output is correct |
| 75 |
Correct |
19 ms |
5500 KB |
Output is correct |
| 76 |
Correct |
239 ms |
49164 KB |
Output is correct |
| 77 |
Correct |
238 ms |
49456 KB |
Output is correct |
| 78 |
Correct |
17 ms |
5716 KB |
Output is correct |
| 79 |
Correct |
349 ms |
54376 KB |
Output is correct |
| 80 |
Correct |
2 ms |
596 KB |
Output is correct |
| 81 |
Correct |
64 ms |
15600 KB |
Output is correct |
| 82 |
Correct |
275 ms |
46332 KB |
Output is correct |
| 83 |
Correct |
354 ms |
42480 KB |
Output is correct |
| 84 |
Correct |
320 ms |
42588 KB |
Output is correct |
| 85 |
Correct |
320 ms |
42432 KB |
Output is correct |
| 86 |
Correct |
316 ms |
45296 KB |
Output is correct |
| 87 |
Correct |
305 ms |
45288 KB |
Output is correct |
