| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 394615 |
2021-04-27T05:55:27 Z |
woldis4 |
Network (BOI15_net) |
C++17 |
|
526 ms |
69076 KB |
# include <bits/stdc++.h>
/*
// ordered_set
# include <ext/pb_ds/assoc_container.hpp>
# include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
# define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
*/
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);
#define MP make_pair
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 = 1e6 + 10;
const int xm = 1e2 + 10;
const int sq = 320;
const int inf = 1e9 + 10;
const ll INF = 1e18 + 10;
const int mod = 998244353;//1e9 + 7;//998244353;
const int base = 257;
ll n, m, k, st[xn], num[xn], cnt = 1;
vector <int> adj[xn];
void dfs(int v, int par = 0){
num[cnt] = v;
st[v] = cnt++;
for (int u : adj[v]){
if (u != par){
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);
}
int mx = 0, indmx = -1;
for (int i = 1; i <= n; ++i){
if (int(adj[i].size()) > mx) indmx = i, mx = int(adj[i].size());
}
dfs(indmx);
vector <int> vec;
for (int i = 1; i <= n; ++i){
if (adj[num[i]].size() == 1) vec.push_back(num[i]);
}
int sz = int(vec.size());
cout << (sz+1)/2 << '\n';
if (sz%2 == 1) cout << vec[0] << ' ' << vec[sz-1] << '\n';
for (int i = 0; i < sz/2; ++i) cout << vec[i] << ' ' << vec[sz/2+i] << '\n';
return 0;
}
/*
6
1 2
2 3
2 4
5 4
6 4
8
1 2
2 3
3 4
4 5
3 6
3 7
3 8
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 2 |
Correct |
19 ms |
23756 KB |
Output is correct |
| 3 |
Correct |
15 ms |
23748 KB |
Output is correct |
| 4 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 5 |
Correct |
14 ms |
23768 KB |
Output is correct |
| 6 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 7 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 8 |
Correct |
13 ms |
23764 KB |
Output is correct |
| 9 |
Correct |
13 ms |
23760 KB |
Output is correct |
| 10 |
Correct |
13 ms |
23720 KB |
Output is correct |
| 11 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 12 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 13 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 14 |
Correct |
13 ms |
23772 KB |
Output is correct |
| 15 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 16 |
Correct |
13 ms |
23808 KB |
Output is correct |
| 17 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 18 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 19 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 20 |
Correct |
13 ms |
23756 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 2 |
Correct |
19 ms |
23756 KB |
Output is correct |
| 3 |
Correct |
15 ms |
23748 KB |
Output is correct |
| 4 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 5 |
Correct |
14 ms |
23768 KB |
Output is correct |
| 6 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 7 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 8 |
Correct |
13 ms |
23764 KB |
Output is correct |
| 9 |
Correct |
13 ms |
23760 KB |
Output is correct |
| 10 |
Correct |
13 ms |
23720 KB |
Output is correct |
| 11 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 12 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 13 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 14 |
Correct |
13 ms |
23772 KB |
Output is correct |
| 15 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 16 |
Correct |
13 ms |
23808 KB |
Output is correct |
| 17 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 18 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 19 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 20 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 21 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 22 |
Correct |
14 ms |
23896 KB |
Output is correct |
| 23 |
Correct |
14 ms |
23888 KB |
Output is correct |
| 24 |
Correct |
16 ms |
23828 KB |
Output is correct |
| 25 |
Correct |
14 ms |
23920 KB |
Output is correct |
| 26 |
Correct |
15 ms |
23908 KB |
Output is correct |
| 27 |
Correct |
16 ms |
23936 KB |
Output is correct |
| 28 |
Correct |
15 ms |
23860 KB |
Output is correct |
| 29 |
Correct |
16 ms |
23892 KB |
Output is correct |
| 30 |
Correct |
16 ms |
23764 KB |
Output is correct |
| 31 |
Correct |
17 ms |
23884 KB |
Output is correct |
| 32 |
Correct |
15 ms |
23700 KB |
Output is correct |
| 33 |
Correct |
15 ms |
23816 KB |
Output is correct |
| 34 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 35 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 36 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 37 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 38 |
Correct |
15 ms |
23780 KB |
Output is correct |
| 39 |
Correct |
14 ms |
23776 KB |
Output is correct |
| 40 |
Correct |
17 ms |
23756 KB |
Output is correct |
| 41 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 42 |
Correct |
16 ms |
23732 KB |
Output is correct |
| 43 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 44 |
Correct |
16 ms |
23752 KB |
Output is correct |
| 45 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 46 |
Correct |
16 ms |
23804 KB |
Output is correct |
| 47 |
Correct |
19 ms |
23816 KB |
Output is correct |
| 48 |
Correct |
16 ms |
23740 KB |
Output is correct |
| 49 |
Correct |
16 ms |
23792 KB |
Output is correct |
| 50 |
Correct |
18 ms |
23756 KB |
Output is correct |
| 51 |
Correct |
17 ms |
23756 KB |
Output is correct |
| 52 |
Correct |
16 ms |
23808 KB |
Output is correct |
| 53 |
Correct |
17 ms |
23812 KB |
Output is correct |
| 54 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 55 |
Correct |
18 ms |
23840 KB |
Output is correct |
| 56 |
Correct |
17 ms |
23800 KB |
Output is correct |
| 57 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 58 |
Correct |
17 ms |
23924 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 2 |
Correct |
19 ms |
23756 KB |
Output is correct |
| 3 |
Correct |
15 ms |
23748 KB |
Output is correct |
| 4 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 5 |
Correct |
14 ms |
23768 KB |
Output is correct |
| 6 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 7 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 8 |
Correct |
13 ms |
23764 KB |
Output is correct |
| 9 |
Correct |
13 ms |
23760 KB |
Output is correct |
| 10 |
Correct |
13 ms |
23720 KB |
Output is correct |
| 11 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 12 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 13 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 14 |
Correct |
13 ms |
23772 KB |
Output is correct |
| 15 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 16 |
Correct |
13 ms |
23808 KB |
Output is correct |
| 17 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 18 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 19 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 20 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 21 |
Correct |
13 ms |
23756 KB |
Output is correct |
| 22 |
Correct |
14 ms |
23896 KB |
Output is correct |
| 23 |
Correct |
14 ms |
23888 KB |
Output is correct |
| 24 |
Correct |
16 ms |
23828 KB |
Output is correct |
| 25 |
Correct |
14 ms |
23920 KB |
Output is correct |
| 26 |
Correct |
15 ms |
23908 KB |
Output is correct |
| 27 |
Correct |
16 ms |
23936 KB |
Output is correct |
| 28 |
Correct |
15 ms |
23860 KB |
Output is correct |
| 29 |
Correct |
16 ms |
23892 KB |
Output is correct |
| 30 |
Correct |
16 ms |
23764 KB |
Output is correct |
| 31 |
Correct |
17 ms |
23884 KB |
Output is correct |
| 32 |
Correct |
15 ms |
23700 KB |
Output is correct |
| 33 |
Correct |
15 ms |
23816 KB |
Output is correct |
| 34 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 35 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 36 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 37 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 38 |
Correct |
15 ms |
23780 KB |
Output is correct |
| 39 |
Correct |
14 ms |
23776 KB |
Output is correct |
| 40 |
Correct |
17 ms |
23756 KB |
Output is correct |
| 41 |
Correct |
14 ms |
23756 KB |
Output is correct |
| 42 |
Correct |
16 ms |
23732 KB |
Output is correct |
| 43 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 44 |
Correct |
16 ms |
23752 KB |
Output is correct |
| 45 |
Correct |
15 ms |
23756 KB |
Output is correct |
| 46 |
Correct |
16 ms |
23804 KB |
Output is correct |
| 47 |
Correct |
19 ms |
23816 KB |
Output is correct |
| 48 |
Correct |
16 ms |
23740 KB |
Output is correct |
| 49 |
Correct |
16 ms |
23792 KB |
Output is correct |
| 50 |
Correct |
18 ms |
23756 KB |
Output is correct |
| 51 |
Correct |
17 ms |
23756 KB |
Output is correct |
| 52 |
Correct |
16 ms |
23808 KB |
Output is correct |
| 53 |
Correct |
17 ms |
23812 KB |
Output is correct |
| 54 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 55 |
Correct |
18 ms |
23840 KB |
Output is correct |
| 56 |
Correct |
17 ms |
23800 KB |
Output is correct |
| 57 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 58 |
Correct |
17 ms |
23924 KB |
Output is correct |
| 59 |
Correct |
379 ms |
48756 KB |
Output is correct |
| 60 |
Correct |
493 ms |
51648 KB |
Output is correct |
| 61 |
Correct |
16 ms |
23756 KB |
Output is correct |
| 62 |
Correct |
16 ms |
23700 KB |
Output is correct |
| 63 |
Correct |
376 ms |
46320 KB |
Output is correct |
| 64 |
Correct |
17 ms |
24140 KB |
Output is correct |
| 65 |
Correct |
24 ms |
25492 KB |
Output is correct |
| 66 |
Correct |
177 ms |
37184 KB |
Output is correct |
| 67 |
Correct |
509 ms |
59952 KB |
Output is correct |
| 68 |
Correct |
526 ms |
69076 KB |
Output is correct |
| 69 |
Correct |
24 ms |
24784 KB |
Output is correct |
| 70 |
Correct |
116 ms |
33444 KB |
Output is correct |
| 71 |
Correct |
332 ms |
54740 KB |
Output is correct |
| 72 |
Correct |
361 ms |
53932 KB |
Output is correct |
| 73 |
Correct |
114 ms |
31300 KB |
Output is correct |
| 74 |
Correct |
510 ms |
50652 KB |
Output is correct |
| 75 |
Correct |
62 ms |
27204 KB |
Output is correct |
| 76 |
Correct |
343 ms |
54388 KB |
Output is correct |
| 77 |
Correct |
341 ms |
54744 KB |
Output is correct |
| 78 |
Correct |
40 ms |
27588 KB |
Output is correct |
| 79 |
Correct |
505 ms |
55076 KB |
Output is correct |
| 80 |
Correct |
17 ms |
24012 KB |
Output is correct |
| 81 |
Correct |
109 ms |
33532 KB |
Output is correct |
| 82 |
Correct |
406 ms |
52700 KB |
Output is correct |
| 83 |
Correct |
484 ms |
50648 KB |
Output is correct |
| 84 |
Correct |
486 ms |
50616 KB |
Output is correct |
| 85 |
Correct |
491 ms |
50596 KB |
Output is correct |
| 86 |
Correct |
492 ms |
51708 KB |
Output is correct |
| 87 |
Correct |
479 ms |
51692 KB |
Output is correct |
