# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
404165 |
2021-05-13T22:52:07 Z |
SavicS |
Network (BOI15_net) |
C++14 |
|
506 ms |
47732 KB |
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ff(i,a,b) for(int i=a;i<=b;i++)
#define fb(i,b,a) for(int i=b;i>=a;i--)
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 500005;
const int inf = 1e9 + 5;
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k) print the k-th smallest number in os(0-based)
int n;
vector<int> g[maxn];
vector<int> leaf;
void dfs(int v, int p){
if(sz(g[v]) == 1)leaf.pb(v);
for(auto u : g[v]){
if(u != p)dfs(u, v);
}
}
int main()
{
ios::sync_with_stdio(false);
cout.tie(nullptr);
cin.tie(nullptr);
cin >> n;
ff(i,1,n - 1){
int u, v;
cin >> u >> v;
g[u].pb(v);
g[v].pb(u);
}
dfs(1, -1);
int len = (sz(leaf) + 1) / 2, add = sz(leaf) / 2;
cout << len << endl;
ff(i,0,len - 1)cout << leaf[i] << " " << leaf[i + add] << '\n';
return 0;
}
/**
8
4 1
8 2
1 3
5 7
4 8
6 1
4 7
// probati bojenje sahovski ili slicno
**/
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
11980 KB |
Output is correct |
2 |
Correct |
7 ms |
11980 KB |
Output is correct |
3 |
Correct |
8 ms |
11980 KB |
Output is correct |
4 |
Correct |
7 ms |
12016 KB |
Output is correct |
5 |
Correct |
7 ms |
11980 KB |
Output is correct |
6 |
Correct |
7 ms |
11992 KB |
Output is correct |
7 |
Correct |
7 ms |
11980 KB |
Output is correct |
8 |
Correct |
7 ms |
11980 KB |
Output is correct |
9 |
Correct |
8 ms |
11980 KB |
Output is correct |
10 |
Correct |
7 ms |
11980 KB |
Output is correct |
11 |
Correct |
7 ms |
12028 KB |
Output is correct |
12 |
Correct |
7 ms |
11980 KB |
Output is correct |
13 |
Correct |
8 ms |
11980 KB |
Output is correct |
14 |
Correct |
7 ms |
11980 KB |
Output is correct |
15 |
Correct |
7 ms |
11980 KB |
Output is correct |
16 |
Correct |
7 ms |
11980 KB |
Output is correct |
17 |
Correct |
8 ms |
12064 KB |
Output is correct |
18 |
Correct |
8 ms |
11980 KB |
Output is correct |
19 |
Correct |
7 ms |
11980 KB |
Output is correct |
20 |
Correct |
7 ms |
12060 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
11980 KB |
Output is correct |
2 |
Correct |
7 ms |
11980 KB |
Output is correct |
3 |
Correct |
8 ms |
11980 KB |
Output is correct |
4 |
Correct |
7 ms |
12016 KB |
Output is correct |
5 |
Correct |
7 ms |
11980 KB |
Output is correct |
6 |
Correct |
7 ms |
11992 KB |
Output is correct |
7 |
Correct |
7 ms |
11980 KB |
Output is correct |
8 |
Correct |
7 ms |
11980 KB |
Output is correct |
9 |
Correct |
8 ms |
11980 KB |
Output is correct |
10 |
Correct |
7 ms |
11980 KB |
Output is correct |
11 |
Correct |
7 ms |
12028 KB |
Output is correct |
12 |
Correct |
7 ms |
11980 KB |
Output is correct |
13 |
Correct |
8 ms |
11980 KB |
Output is correct |
14 |
Correct |
7 ms |
11980 KB |
Output is correct |
15 |
Correct |
7 ms |
11980 KB |
Output is correct |
16 |
Correct |
7 ms |
11980 KB |
Output is correct |
17 |
Correct |
8 ms |
12064 KB |
Output is correct |
18 |
Correct |
8 ms |
11980 KB |
Output is correct |
19 |
Correct |
7 ms |
11980 KB |
Output is correct |
20 |
Correct |
7 ms |
12060 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 |
12072 KB |
Output is correct |
24 |
Correct |
8 ms |
12108 KB |
Output is correct |
25 |
Correct |
8 ms |
12108 KB |
Output is correct |
26 |
Correct |
8 ms |
12108 KB |
Output is correct |
27 |
Correct |
9 ms |
12108 KB |
Output is correct |
28 |
Correct |
9 ms |
12092 KB |
Output is correct |
29 |
Correct |
8 ms |
12072 KB |
Output is correct |
30 |
Correct |
9 ms |
11980 KB |
Output is correct |
31 |
Correct |
8 ms |
12072 KB |
Output is correct |
32 |
Correct |
7 ms |
12032 KB |
Output is correct |
33 |
Correct |
7 ms |
12060 KB |
Output is correct |
34 |
Correct |
8 ms |
12108 KB |
Output is correct |
35 |
Correct |
7 ms |
11980 KB |
Output is correct |
36 |
Correct |
8 ms |
11980 KB |
Output is correct |
37 |
Correct |
8 ms |
11980 KB |
Output is correct |
38 |
Correct |
9 ms |
12108 KB |
Output is correct |
39 |
Correct |
8 ms |
11980 KB |
Output is correct |
40 |
Correct |
7 ms |
11980 KB |
Output is correct |
41 |
Correct |
8 ms |
12012 KB |
Output is correct |
42 |
Correct |
8 ms |
12036 KB |
Output is correct |
43 |
Correct |
8 ms |
12108 KB |
Output is correct |
44 |
Correct |
7 ms |
11980 KB |
Output is correct |
45 |
Correct |
8 ms |
12064 KB |
Output is correct |
46 |
Correct |
8 ms |
11980 KB |
Output is correct |
47 |
Correct |
8 ms |
12012 KB |
Output is correct |
48 |
Correct |
8 ms |
11980 KB |
Output is correct |
49 |
Correct |
8 ms |
12108 KB |
Output is correct |
50 |
Correct |
7 ms |
12060 KB |
Output is correct |
51 |
Correct |
7 ms |
12036 KB |
Output is correct |
52 |
Correct |
8 ms |
11980 KB |
Output is correct |
53 |
Correct |
8 ms |
12108 KB |
Output is correct |
54 |
Correct |
8 ms |
12060 KB |
Output is correct |
55 |
Correct |
9 ms |
11980 KB |
Output is correct |
56 |
Correct |
8 ms |
11980 KB |
Output is correct |
57 |
Correct |
9 ms |
12060 KB |
Output is correct |
58 |
Correct |
8 ms |
12108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
7 ms |
11980 KB |
Output is correct |
2 |
Correct |
7 ms |
11980 KB |
Output is correct |
3 |
Correct |
8 ms |
11980 KB |
Output is correct |
4 |
Correct |
7 ms |
12016 KB |
Output is correct |
5 |
Correct |
7 ms |
11980 KB |
Output is correct |
6 |
Correct |
7 ms |
11992 KB |
Output is correct |
7 |
Correct |
7 ms |
11980 KB |
Output is correct |
8 |
Correct |
7 ms |
11980 KB |
Output is correct |
9 |
Correct |
8 ms |
11980 KB |
Output is correct |
10 |
Correct |
7 ms |
11980 KB |
Output is correct |
11 |
Correct |
7 ms |
12028 KB |
Output is correct |
12 |
Correct |
7 ms |
11980 KB |
Output is correct |
13 |
Correct |
8 ms |
11980 KB |
Output is correct |
14 |
Correct |
7 ms |
11980 KB |
Output is correct |
15 |
Correct |
7 ms |
11980 KB |
Output is correct |
16 |
Correct |
7 ms |
11980 KB |
Output is correct |
17 |
Correct |
8 ms |
12064 KB |
Output is correct |
18 |
Correct |
8 ms |
11980 KB |
Output is correct |
19 |
Correct |
7 ms |
11980 KB |
Output is correct |
20 |
Correct |
7 ms |
12060 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 |
12072 KB |
Output is correct |
24 |
Correct |
8 ms |
12108 KB |
Output is correct |
25 |
Correct |
8 ms |
12108 KB |
Output is correct |
26 |
Correct |
8 ms |
12108 KB |
Output is correct |
27 |
Correct |
9 ms |
12108 KB |
Output is correct |
28 |
Correct |
9 ms |
12092 KB |
Output is correct |
29 |
Correct |
8 ms |
12072 KB |
Output is correct |
30 |
Correct |
9 ms |
11980 KB |
Output is correct |
31 |
Correct |
8 ms |
12072 KB |
Output is correct |
32 |
Correct |
7 ms |
12032 KB |
Output is correct |
33 |
Correct |
7 ms |
12060 KB |
Output is correct |
34 |
Correct |
8 ms |
12108 KB |
Output is correct |
35 |
Correct |
7 ms |
11980 KB |
Output is correct |
36 |
Correct |
8 ms |
11980 KB |
Output is correct |
37 |
Correct |
8 ms |
11980 KB |
Output is correct |
38 |
Correct |
9 ms |
12108 KB |
Output is correct |
39 |
Correct |
8 ms |
11980 KB |
Output is correct |
40 |
Correct |
7 ms |
11980 KB |
Output is correct |
41 |
Correct |
8 ms |
12012 KB |
Output is correct |
42 |
Correct |
8 ms |
12036 KB |
Output is correct |
43 |
Correct |
8 ms |
12108 KB |
Output is correct |
44 |
Correct |
7 ms |
11980 KB |
Output is correct |
45 |
Correct |
8 ms |
12064 KB |
Output is correct |
46 |
Correct |
8 ms |
11980 KB |
Output is correct |
47 |
Correct |
8 ms |
12012 KB |
Output is correct |
48 |
Correct |
8 ms |
11980 KB |
Output is correct |
49 |
Correct |
8 ms |
12108 KB |
Output is correct |
50 |
Correct |
7 ms |
12060 KB |
Output is correct |
51 |
Correct |
7 ms |
12036 KB |
Output is correct |
52 |
Correct |
8 ms |
11980 KB |
Output is correct |
53 |
Correct |
8 ms |
12108 KB |
Output is correct |
54 |
Correct |
8 ms |
12060 KB |
Output is correct |
55 |
Correct |
9 ms |
11980 KB |
Output is correct |
56 |
Correct |
8 ms |
11980 KB |
Output is correct |
57 |
Correct |
9 ms |
12060 KB |
Output is correct |
58 |
Correct |
8 ms |
12108 KB |
Output is correct |
59 |
Correct |
346 ms |
36020 KB |
Output is correct |
60 |
Correct |
419 ms |
38872 KB |
Output is correct |
61 |
Correct |
8 ms |
11980 KB |
Output is correct |
62 |
Correct |
9 ms |
12060 KB |
Output is correct |
63 |
Correct |
315 ms |
33580 KB |
Output is correct |
64 |
Correct |
9 ms |
12364 KB |
Output is correct |
65 |
Correct |
18 ms |
13920 KB |
Output is correct |
66 |
Correct |
127 ms |
27888 KB |
Output is correct |
67 |
Correct |
449 ms |
46848 KB |
Output is correct |
68 |
Correct |
454 ms |
47732 KB |
Output is correct |
69 |
Correct |
14 ms |
12876 KB |
Output is correct |
70 |
Correct |
94 ms |
21188 KB |
Output is correct |
71 |
Correct |
302 ms |
41884 KB |
Output is correct |
72 |
Correct |
321 ms |
40660 KB |
Output is correct |
73 |
Correct |
82 ms |
19012 KB |
Output is correct |
74 |
Correct |
425 ms |
37724 KB |
Output is correct |
75 |
Correct |
33 ms |
15180 KB |
Output is correct |
76 |
Correct |
318 ms |
41612 KB |
Output is correct |
77 |
Correct |
310 ms |
41628 KB |
Output is correct |
78 |
Correct |
42 ms |
15300 KB |
Output is correct |
79 |
Correct |
506 ms |
45228 KB |
Output is correct |
80 |
Correct |
9 ms |
12236 KB |
Output is correct |
81 |
Correct |
103 ms |
21184 KB |
Output is correct |
82 |
Correct |
378 ms |
39440 KB |
Output is correct |
83 |
Correct |
430 ms |
37748 KB |
Output is correct |
84 |
Correct |
503 ms |
37616 KB |
Output is correct |
85 |
Correct |
456 ms |
37672 KB |
Output is correct |
86 |
Correct |
443 ms |
38720 KB |
Output is correct |
87 |
Correct |
453 ms |
38720 KB |
Output is correct |