| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 639533 |
2022-09-10T13:41:21 Z |
zordeno |
Network (BOI15_net) |
C++17 |
|
413 ms |
42060 KB |
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ll long long
const ll MOD = 1e9 + 7, MAX = 5e5 + 5, INF = 1e18;
vector <int> dx = { 1, 0, 0, -1, 1, 1, -1, -1 };
vector <int> dy = { 0, 1, -1, 0, -1, 1, 1, -1 };
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return (a / gcd(a, b)) * b; }
vector <ll> adj[MAX];
vector <bool> vis(MAX);
vector <ll> ans;
void dfs(ll node)
{
if (adj[node].size() == 1)
{
ans.push_back(node);
}
vis[node] = true;
for (auto child : adj[node])
{
if (!vis[child])
{
dfs(child);
}
}
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen("", "r", stdin);
//freopen("", "w", stdout);
ll n;
cin >> n;
for (ll i = 0; i < n - 1; i++)
{
ll u, v;
cin >> u >> v;
u--, v--;
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs(0);
cout << ceil(ans.size() * 1.0 / 2.0) << endl;
for (ll i = 0; i < ans.size() / 2; i++)
{
cout << ans[i] + 1 << " " << ans[i + ceil(ans.size()*1.0 / 2.0)] + 1 << endl;
}
if (ans.size() % 2 != 0)
{
cout << ans[ans.size() / 2] + 1 << " 1" << endl;
}
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:51:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
51 | for (ll i = 0; i < ans.size() / 2; i++)
| ~~^~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 2 |
Correct |
5 ms |
12116 KB |
Output is correct |
| 3 |
Correct |
5 ms |
12116 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 5 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 6 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 7 |
Correct |
6 ms |
12008 KB |
Output is correct |
| 8 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 9 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 10 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 12 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 13 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 14 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 16 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 17 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 18 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 19 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 20 |
Correct |
6 ms |
12056 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 2 |
Correct |
5 ms |
12116 KB |
Output is correct |
| 3 |
Correct |
5 ms |
12116 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 5 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 6 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 7 |
Correct |
6 ms |
12008 KB |
Output is correct |
| 8 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 9 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 10 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 12 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 13 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 14 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 16 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 17 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 18 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 19 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 20 |
Correct |
6 ms |
12056 KB |
Output is correct |
| 21 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 22 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12244 KB |
Output is correct |
| 24 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 25 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 28 |
Correct |
7 ms |
12244 KB |
Output is correct |
| 29 |
Correct |
7 ms |
12208 KB |
Output is correct |
| 30 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 31 |
Correct |
7 ms |
12212 KB |
Output is correct |
| 32 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 33 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 34 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 35 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 36 |
Correct |
6 ms |
12036 KB |
Output is correct |
| 37 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 38 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 39 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 40 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 41 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 42 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 43 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 45 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12168 KB |
Output is correct |
| 47 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 49 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
6 ms |
12128 KB |
Output is correct |
| 51 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 52 |
Correct |
6 ms |
12144 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 54 |
Correct |
6 ms |
12092 KB |
Output is correct |
| 55 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 56 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 57 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 58 |
Correct |
7 ms |
12244 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 2 |
Correct |
5 ms |
12116 KB |
Output is correct |
| 3 |
Correct |
5 ms |
12116 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 5 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 6 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 7 |
Correct |
6 ms |
12008 KB |
Output is correct |
| 8 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 9 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 10 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 12 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 13 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 14 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 16 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 17 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 18 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 19 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 20 |
Correct |
6 ms |
12056 KB |
Output is correct |
| 21 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 22 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12244 KB |
Output is correct |
| 24 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 25 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
6 ms |
12244 KB |
Output is correct |
| 28 |
Correct |
7 ms |
12244 KB |
Output is correct |
| 29 |
Correct |
7 ms |
12208 KB |
Output is correct |
| 30 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 31 |
Correct |
7 ms |
12212 KB |
Output is correct |
| 32 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 33 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 34 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 35 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 36 |
Correct |
6 ms |
12036 KB |
Output is correct |
| 37 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 38 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 39 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 40 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 41 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 42 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 43 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 45 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12168 KB |
Output is correct |
| 47 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 49 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
6 ms |
12128 KB |
Output is correct |
| 51 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 52 |
Correct |
6 ms |
12144 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 54 |
Correct |
6 ms |
12092 KB |
Output is correct |
| 55 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 56 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 57 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 58 |
Correct |
7 ms |
12244 KB |
Output is correct |
| 59 |
Correct |
276 ms |
34684 KB |
Output is correct |
| 60 |
Correct |
343 ms |
36788 KB |
Output is correct |
| 61 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 62 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 63 |
Correct |
239 ms |
31504 KB |
Output is correct |
| 64 |
Correct |
7 ms |
12500 KB |
Output is correct |
| 65 |
Correct |
14 ms |
13656 KB |
Output is correct |
| 66 |
Correct |
113 ms |
25744 KB |
Output is correct |
| 67 |
Correct |
377 ms |
40268 KB |
Output is correct |
| 68 |
Correct |
413 ms |
42060 KB |
Output is correct |
| 69 |
Correct |
11 ms |
13012 KB |
Output is correct |
| 70 |
Correct |
72 ms |
21256 KB |
Output is correct |
| 71 |
Correct |
238 ms |
39072 KB |
Output is correct |
| 72 |
Correct |
248 ms |
38056 KB |
Output is correct |
| 73 |
Correct |
80 ms |
18424 KB |
Output is correct |
| 74 |
Correct |
347 ms |
34616 KB |
Output is correct |
| 75 |
Correct |
23 ms |
15100 KB |
Output is correct |
| 76 |
Correct |
241 ms |
38588 KB |
Output is correct |
| 77 |
Correct |
231 ms |
39076 KB |
Output is correct |
| 78 |
Correct |
25 ms |
15048 KB |
Output is correct |
| 79 |
Correct |
375 ms |
38580 KB |
Output is correct |
| 80 |
Correct |
7 ms |
12244 KB |
Output is correct |
| 81 |
Correct |
78 ms |
20476 KB |
Output is correct |
| 82 |
Correct |
303 ms |
36824 KB |
Output is correct |
| 83 |
Correct |
350 ms |
34520 KB |
Output is correct |
| 84 |
Correct |
361 ms |
34576 KB |
Output is correct |
| 85 |
Correct |
346 ms |
34696 KB |
Output is correct |
| 86 |
Correct |
350 ms |
36880 KB |
Output is correct |
| 87 |
Correct |
342 ms |
36792 KB |
Output is correct |
