# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
831256 |
2023-08-20T02:46:00 Z |
Cookie |
Network (BOI15_net) |
C++14 |
|
426 ms |
49708 KB |
#include<bits/stdc++.h>
#include<fstream>
//#pragma GCC optimize("Ofast,O3,unroll-loops")
//#pragma GCC target("avx2")
using namespace std;
ifstream fin("palpath.in");
ofstream fout("palpath.out");
#define sz(a) (int)a.size()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
const ll mod = 1e9 + 7;
const int mxn = 5e5 + 5, mxr = 25e3, sq = 500, mxv = 1e6 + 5, mxvv = 130, pr = 31, inf = 1e9;
int n;
int in[mxn + 1];
vt<int>leaf;
vt<int>adj[mxn + 1];
void dfs(int s, int pre){
bool ok = 0;
for(auto i: adj[s]){
if(i != pre){
dfs(i, s); ok = 1;
}
}
if(!ok)leaf.pb(s);
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
for(int i = 1; i < n; i++){
int u, v; cin >> u >> v;
in[u]++; in[v]++;
adj[u].pb(v); adj[v].pb(u);
}
for(int i = 1; i <= n; i++){
if(in[i] > 1){
dfs(i, -1);
break;
}
}
cout << ((sz(leaf) + 1) / 2) << "\n";
for(int i = 0; i <= sz(leaf) / 2 - 1; i++){
cout << leaf[i] << " " << leaf[i + sz(leaf) / 2] << "\n";
}
if(sz(leaf) & 1){
cout << leaf[0] << " " << leaf.back();
}
return(0);
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
5 ms |
11988 KB |
Output is correct |
2 |
Correct |
7 ms |
12076 KB |
Output is correct |
3 |
Correct |
6 ms |
12084 KB |
Output is correct |
4 |
Correct |
6 ms |
11988 KB |
Output is correct |
5 |
Correct |
8 ms |
12084 KB |
Output is correct |
6 |
Correct |
5 ms |
12076 KB |
Output is correct |
7 |
Correct |
6 ms |
12080 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
5 ms |
11988 KB |
Output is correct |
10 |
Correct |
5 ms |
11988 KB |
Output is correct |
11 |
Correct |
5 ms |
12088 KB |
Output is correct |
12 |
Correct |
6 ms |
11996 KB |
Output is correct |
13 |
Correct |
7 ms |
11988 KB |
Output is correct |
14 |
Correct |
5 ms |
12080 KB |
Output is correct |
15 |
Correct |
5 ms |
11988 KB |
Output is correct |
16 |
Correct |
5 ms |
11988 KB |
Output is correct |
17 |
Correct |
5 ms |
11988 KB |
Output is correct |
18 |
Correct |
5 ms |
11988 KB |
Output is correct |
19 |
Correct |
5 ms |
11988 KB |
Output is correct |
20 |
Correct |
6 ms |
12080 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
5 ms |
11988 KB |
Output is correct |
2 |
Correct |
7 ms |
12076 KB |
Output is correct |
3 |
Correct |
6 ms |
12084 KB |
Output is correct |
4 |
Correct |
6 ms |
11988 KB |
Output is correct |
5 |
Correct |
8 ms |
12084 KB |
Output is correct |
6 |
Correct |
5 ms |
12076 KB |
Output is correct |
7 |
Correct |
6 ms |
12080 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
5 ms |
11988 KB |
Output is correct |
10 |
Correct |
5 ms |
11988 KB |
Output is correct |
11 |
Correct |
5 ms |
12088 KB |
Output is correct |
12 |
Correct |
6 ms |
11996 KB |
Output is correct |
13 |
Correct |
7 ms |
11988 KB |
Output is correct |
14 |
Correct |
5 ms |
12080 KB |
Output is correct |
15 |
Correct |
5 ms |
11988 KB |
Output is correct |
16 |
Correct |
5 ms |
11988 KB |
Output is correct |
17 |
Correct |
5 ms |
11988 KB |
Output is correct |
18 |
Correct |
5 ms |
11988 KB |
Output is correct |
19 |
Correct |
5 ms |
11988 KB |
Output is correct |
20 |
Correct |
6 ms |
12080 KB |
Output is correct |
21 |
Correct |
8 ms |
12080 KB |
Output is correct |
22 |
Correct |
7 ms |
12092 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
9 ms |
12096 KB |
Output is correct |
25 |
Correct |
8 ms |
12116 KB |
Output is correct |
26 |
Correct |
7 ms |
12116 KB |
Output is correct |
27 |
Correct |
6 ms |
12160 KB |
Output is correct |
28 |
Correct |
5 ms |
12116 KB |
Output is correct |
29 |
Correct |
6 ms |
12116 KB |
Output is correct |
30 |
Correct |
7 ms |
12084 KB |
Output is correct |
31 |
Correct |
7 ms |
12148 KB |
Output is correct |
32 |
Correct |
7 ms |
11988 KB |
Output is correct |
33 |
Correct |
5 ms |
11988 KB |
Output is correct |
34 |
Correct |
6 ms |
12036 KB |
Output is correct |
35 |
Correct |
6 ms |
11988 KB |
Output is correct |
36 |
Correct |
5 ms |
12008 KB |
Output is correct |
37 |
Correct |
5 ms |
12088 KB |
Output is correct |
38 |
Correct |
5 ms |
12080 KB |
Output is correct |
39 |
Correct |
6 ms |
11988 KB |
Output is correct |
40 |
Correct |
6 ms |
11988 KB |
Output is correct |
41 |
Correct |
5 ms |
12076 KB |
Output is correct |
42 |
Correct |
7 ms |
11988 KB |
Output is correct |
43 |
Correct |
5 ms |
12116 KB |
Output is correct |
44 |
Correct |
7 ms |
12080 KB |
Output is correct |
45 |
Correct |
5 ms |
11988 KB |
Output is correct |
46 |
Correct |
7 ms |
12116 KB |
Output is correct |
47 |
Correct |
6 ms |
12076 KB |
Output is correct |
48 |
Correct |
5 ms |
12052 KB |
Output is correct |
49 |
Correct |
6 ms |
12116 KB |
Output is correct |
50 |
Correct |
5 ms |
12080 KB |
Output is correct |
51 |
Correct |
6 ms |
11988 KB |
Output is correct |
52 |
Correct |
8 ms |
11988 KB |
Output is correct |
53 |
Correct |
6 ms |
12116 KB |
Output is correct |
54 |
Correct |
5 ms |
11988 KB |
Output is correct |
55 |
Correct |
5 ms |
12088 KB |
Output is correct |
56 |
Correct |
6 ms |
12076 KB |
Output is correct |
57 |
Correct |
7 ms |
11988 KB |
Output is correct |
58 |
Correct |
9 ms |
12092 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
5 ms |
11988 KB |
Output is correct |
2 |
Correct |
7 ms |
12076 KB |
Output is correct |
3 |
Correct |
6 ms |
12084 KB |
Output is correct |
4 |
Correct |
6 ms |
11988 KB |
Output is correct |
5 |
Correct |
8 ms |
12084 KB |
Output is correct |
6 |
Correct |
5 ms |
12076 KB |
Output is correct |
7 |
Correct |
6 ms |
12080 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
5 ms |
11988 KB |
Output is correct |
10 |
Correct |
5 ms |
11988 KB |
Output is correct |
11 |
Correct |
5 ms |
12088 KB |
Output is correct |
12 |
Correct |
6 ms |
11996 KB |
Output is correct |
13 |
Correct |
7 ms |
11988 KB |
Output is correct |
14 |
Correct |
5 ms |
12080 KB |
Output is correct |
15 |
Correct |
5 ms |
11988 KB |
Output is correct |
16 |
Correct |
5 ms |
11988 KB |
Output is correct |
17 |
Correct |
5 ms |
11988 KB |
Output is correct |
18 |
Correct |
5 ms |
11988 KB |
Output is correct |
19 |
Correct |
5 ms |
11988 KB |
Output is correct |
20 |
Correct |
6 ms |
12080 KB |
Output is correct |
21 |
Correct |
8 ms |
12080 KB |
Output is correct |
22 |
Correct |
7 ms |
12092 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
9 ms |
12096 KB |
Output is correct |
25 |
Correct |
8 ms |
12116 KB |
Output is correct |
26 |
Correct |
7 ms |
12116 KB |
Output is correct |
27 |
Correct |
6 ms |
12160 KB |
Output is correct |
28 |
Correct |
5 ms |
12116 KB |
Output is correct |
29 |
Correct |
6 ms |
12116 KB |
Output is correct |
30 |
Correct |
7 ms |
12084 KB |
Output is correct |
31 |
Correct |
7 ms |
12148 KB |
Output is correct |
32 |
Correct |
7 ms |
11988 KB |
Output is correct |
33 |
Correct |
5 ms |
11988 KB |
Output is correct |
34 |
Correct |
6 ms |
12036 KB |
Output is correct |
35 |
Correct |
6 ms |
11988 KB |
Output is correct |
36 |
Correct |
5 ms |
12008 KB |
Output is correct |
37 |
Correct |
5 ms |
12088 KB |
Output is correct |
38 |
Correct |
5 ms |
12080 KB |
Output is correct |
39 |
Correct |
6 ms |
11988 KB |
Output is correct |
40 |
Correct |
6 ms |
11988 KB |
Output is correct |
41 |
Correct |
5 ms |
12076 KB |
Output is correct |
42 |
Correct |
7 ms |
11988 KB |
Output is correct |
43 |
Correct |
5 ms |
12116 KB |
Output is correct |
44 |
Correct |
7 ms |
12080 KB |
Output is correct |
45 |
Correct |
5 ms |
11988 KB |
Output is correct |
46 |
Correct |
7 ms |
12116 KB |
Output is correct |
47 |
Correct |
6 ms |
12076 KB |
Output is correct |
48 |
Correct |
5 ms |
12052 KB |
Output is correct |
49 |
Correct |
6 ms |
12116 KB |
Output is correct |
50 |
Correct |
5 ms |
12080 KB |
Output is correct |
51 |
Correct |
6 ms |
11988 KB |
Output is correct |
52 |
Correct |
8 ms |
11988 KB |
Output is correct |
53 |
Correct |
6 ms |
12116 KB |
Output is correct |
54 |
Correct |
5 ms |
11988 KB |
Output is correct |
55 |
Correct |
5 ms |
12088 KB |
Output is correct |
56 |
Correct |
6 ms |
12076 KB |
Output is correct |
57 |
Correct |
7 ms |
11988 KB |
Output is correct |
58 |
Correct |
9 ms |
12092 KB |
Output is correct |
59 |
Correct |
288 ms |
37704 KB |
Output is correct |
60 |
Correct |
316 ms |
40688 KB |
Output is correct |
61 |
Correct |
6 ms |
12060 KB |
Output is correct |
62 |
Correct |
5 ms |
11988 KB |
Output is correct |
63 |
Correct |
194 ms |
35128 KB |
Output is correct |
64 |
Correct |
9 ms |
12504 KB |
Output is correct |
65 |
Correct |
14 ms |
14012 KB |
Output is correct |
66 |
Correct |
124 ms |
28588 KB |
Output is correct |
67 |
Correct |
373 ms |
48860 KB |
Output is correct |
68 |
Correct |
384 ms |
49708 KB |
Output is correct |
69 |
Correct |
10 ms |
13012 KB |
Output is correct |
70 |
Correct |
54 ms |
21800 KB |
Output is correct |
71 |
Correct |
196 ms |
43832 KB |
Output is correct |
72 |
Correct |
213 ms |
42700 KB |
Output is correct |
73 |
Correct |
48 ms |
19604 KB |
Output is correct |
74 |
Correct |
308 ms |
39684 KB |
Output is correct |
75 |
Correct |
22 ms |
15436 KB |
Output is correct |
76 |
Correct |
233 ms |
43492 KB |
Output is correct |
77 |
Correct |
241 ms |
43564 KB |
Output is correct |
78 |
Correct |
22 ms |
15700 KB |
Output is correct |
79 |
Correct |
426 ms |
47092 KB |
Output is correct |
80 |
Correct |
8 ms |
12244 KB |
Output is correct |
81 |
Correct |
59 ms |
21992 KB |
Output is correct |
82 |
Correct |
310 ms |
41492 KB |
Output is correct |
83 |
Correct |
288 ms |
39568 KB |
Output is correct |
84 |
Correct |
338 ms |
39608 KB |
Output is correct |
85 |
Correct |
339 ms |
39652 KB |
Output is correct |
86 |
Correct |
290 ms |
40716 KB |
Output is correct |
87 |
Correct |
368 ms |
40692 KB |
Output is correct |