| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 394603 |
2021-04-27T05:46:04 Z |
AmShZ |
Network (BOI15_net) |
C++11 |
|
641 ms |
51392 KB |
// khodaya khodet komak kon
// Toxicity
# include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair <int, int> pii;
typedef pair <pii, int> ppi;
typedef pair <int, pii> pip;
typedef pair <pii, pii> ppp;
typedef pair <ll, ll> pll;
# define A first
# define B second
# define endl '\n'
# define sep ' '
# define all(x) x.begin(), x.end()
# define kill(x) return cout << x << endl, 0
# define SZ(x) int(x.size())
# define lc id << 1
# define rc id << 1 | 1
# define InTheNameOfGod ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
ll power(ll a, ll b, ll md) {return (!b ? 1 : (b & 1 ? a * power(a * a % md, b / 2, md) % md : power(a * a % md, b / 2, md) % md));}
const int xn = 5e5 + 10;
const int xm = - 20 + 10;
const int sq = 320;
const int inf = 1e9 + 10;
const ll INF = 1e18 + 10;
const int mod = 998244353;
const int base = 257;
int n, sz[xn], root, m, a[xn];
vector <int> adj[xn];
void plant(int v, int p = - 1){
sz[v] = 1;
for (int u : adj[v])
if (u != p)
plant(u, v), sz[v] += sz[u];
}
int find_centroid(int v, int p = - 1){
for (int u : adj[v])
if (u != p && sz[u] + sz[u] > n)
return find_centroid(u, v);
return v;
}
void DFS(int v, int p = - 1){
if (SZ(adj[v]) == 1)
a[m ++] = v;
for (int u : adj[v])
if (u != p)
DFS(u, v);
}
int main(){
InTheNameOfGod;
cin >> n;
for (int i = 0; i < n - 1; ++ i){
int v, u;
cin >> v >> u;
adj[v].push_back(u);
adj[u].push_back(v);
}
plant(1);
root = find_centroid(1);
DFS(root);
cout << (m + 1) / 2 << endl;
for (int i = 0; i < (m + 1) / 2; ++ i)
cout << a[i] << sep << a[i + m / 2] << endl;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 12 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 16 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 18 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12016 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 12 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 16 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 18 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 21 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
7 ms |
12112 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 28 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12104 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 37 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 38 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12084 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
12084 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12040 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
8 ms |
12084 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12108 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 12 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 16 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 18 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 21 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
7 ms |
12112 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 28 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12104 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 37 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 38 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12084 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
12084 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12040 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
8 ms |
12084 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 59 |
Correct |
384 ms |
31692 KB |
Output is correct |
| 60 |
Correct |
461 ms |
33972 KB |
Output is correct |
| 61 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 62 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 63 |
Correct |
346 ms |
29724 KB |
Output is correct |
| 64 |
Correct |
10 ms |
12620 KB |
Output is correct |
| 65 |
Correct |
21 ms |
14356 KB |
Output is correct |
| 66 |
Correct |
204 ms |
31696 KB |
Output is correct |
| 67 |
Correct |
641 ms |
50608 KB |
Output is correct |
| 68 |
Correct |
624 ms |
51392 KB |
Output is correct |
| 69 |
Correct |
16 ms |
12876 KB |
Output is correct |
| 70 |
Correct |
99 ms |
19676 KB |
Output is correct |
| 71 |
Correct |
355 ms |
36924 KB |
Output is correct |
| 72 |
Correct |
367 ms |
36152 KB |
Output is correct |
| 73 |
Correct |
114 ms |
17732 KB |
Output is correct |
| 74 |
Correct |
521 ms |
32836 KB |
Output is correct |
| 75 |
Correct |
32 ms |
14668 KB |
Output is correct |
| 76 |
Correct |
351 ms |
36676 KB |
Output is correct |
| 77 |
Correct |
335 ms |
36912 KB |
Output is correct |
| 78 |
Correct |
37 ms |
15300 KB |
Output is correct |
| 79 |
Correct |
630 ms |
47736 KB |
Output is correct |
| 80 |
Correct |
9 ms |
12236 KB |
Output is correct |
| 81 |
Correct |
116 ms |
19684 KB |
Output is correct |
| 82 |
Correct |
462 ms |
34880 KB |
Output is correct |
| 83 |
Correct |
508 ms |
32836 KB |
Output is correct |
| 84 |
Correct |
535 ms |
32836 KB |
Output is correct |
| 85 |
Correct |
543 ms |
32856 KB |
Output is correct |
| 86 |
Correct |
497 ms |
33852 KB |
Output is correct |
| 87 |
Correct |
542 ms |
33876 KB |
Output is correct |
