| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 940079 |
2024-03-07T05:12:18 Z |
vjudge1 |
Network (BOI15_net) |
C++17 |
|
378 ms |
39436 KB |
#include<bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
#define pb push_back
#define F first
#define S second
#define len(x) (int)x.size()
#define all(x) x.begin(),x.end()
#define file freopen("matrix.txt", "r", stdin);freopen("a.out", "w", stdout);
#define kill(x) {cout << x << '\n'; continue;}
#define int long long
#define double long double
const int maxn = 5e5 + 5, LG = 20, MOD = 1e9+7;// 998244353
const ll inf = 1061109567;
//priority_queue< pii , vector<pii> , greater<pii> pq;
int n;
vector<int> g[maxn], l;
void dfs(int v = 1, int par = 0) {
if(len(g[v]) == 1) l.pb(v);
for(int u : g[v]) if(u ^ par) dfs(u, v);
}
signed main() {
ios::sync_with_stdio(0), cin.tie(0);
cin >> n;
for(int i =0; i<n-1; ++i) {
int v, u;
cin >> v >> u;
g[v].pb(u);
g[u].pb(v);
}
dfs();
int t = (len(l) + 1)/2;
cout << t << '\n';
for(int i = 0; i < t; ++i)
cout << l[i] << ' ' << l[i+len(l)/2] << '\n';
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12148 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12376 KB |
Output is correct |
| 6 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 7 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12144 KB |
Output is correct |
| 10 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 12 |
Correct |
4 ms |
12140 KB |
Output is correct |
| 13 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 20 |
Correct |
4 ms |
12124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12148 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12376 KB |
Output is correct |
| 6 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 7 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12144 KB |
Output is correct |
| 10 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 12 |
Correct |
4 ms |
12140 KB |
Output is correct |
| 13 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 20 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 22 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 23 |
Correct |
5 ms |
12120 KB |
Output is correct |
| 24 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 25 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 27 |
Correct |
5 ms |
12120 KB |
Output is correct |
| 28 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 29 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 31 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 34 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 35 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 36 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 37 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 39 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 40 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 41 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 43 |
Correct |
4 ms |
12376 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 46 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 52 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 54 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 55 |
Correct |
4 ms |
12132 KB |
Output is correct |
| 56 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12148 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12376 KB |
Output is correct |
| 6 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 7 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12144 KB |
Output is correct |
| 10 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 12 |
Correct |
4 ms |
12140 KB |
Output is correct |
| 13 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 20 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 22 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 23 |
Correct |
5 ms |
12120 KB |
Output is correct |
| 24 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 25 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 27 |
Correct |
5 ms |
12120 KB |
Output is correct |
| 28 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 29 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 31 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 34 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 35 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 36 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 37 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 39 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 40 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 41 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 43 |
Correct |
4 ms |
12376 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 46 |
Correct |
5 ms |
12124 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 52 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 54 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 55 |
Correct |
4 ms |
12132 KB |
Output is correct |
| 56 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 59 |
Correct |
276 ms |
35528 KB |
Output is correct |
| 60 |
Correct |
344 ms |
37160 KB |
Output is correct |
| 61 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 62 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 63 |
Correct |
205 ms |
32536 KB |
Output is correct |
| 64 |
Correct |
4 ms |
12376 KB |
Output is correct |
| 65 |
Correct |
10 ms |
13688 KB |
Output is correct |
| 66 |
Correct |
106 ms |
24212 KB |
Output is correct |
| 67 |
Correct |
378 ms |
38216 KB |
Output is correct |
| 68 |
Correct |
347 ms |
39436 KB |
Output is correct |
| 69 |
Correct |
7 ms |
13144 KB |
Output is correct |
| 70 |
Correct |
51 ms |
21316 KB |
Output is correct |
| 71 |
Correct |
180 ms |
39352 KB |
Output is correct |
| 72 |
Correct |
197 ms |
38840 KB |
Output is correct |
| 73 |
Correct |
48 ms |
18332 KB |
Output is correct |
| 74 |
Correct |
296 ms |
34584 KB |
Output is correct |
| 75 |
Correct |
17 ms |
15056 KB |
Output is correct |
| 76 |
Correct |
198 ms |
38676 KB |
Output is correct |
| 77 |
Correct |
189 ms |
39156 KB |
Output is correct |
| 78 |
Correct |
18 ms |
14940 KB |
Output is correct |
| 79 |
Correct |
315 ms |
36432 KB |
Output is correct |
| 80 |
Correct |
4 ms |
12376 KB |
Output is correct |
| 81 |
Correct |
55 ms |
20616 KB |
Output is correct |
| 82 |
Correct |
228 ms |
37200 KB |
Output is correct |
| 83 |
Correct |
295 ms |
34504 KB |
Output is correct |
| 84 |
Correct |
283 ms |
34752 KB |
Output is correct |
| 85 |
Correct |
280 ms |
34472 KB |
Output is correct |
| 86 |
Correct |
302 ms |
37904 KB |
Output is correct |
| 87 |
Correct |
262 ms |
37816 KB |
Output is correct |
