| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 119019 |
2019-06-20T07:41:53 Z |
SOIVIEONE |
Network (BOI15_net) |
C++14 |
|
855 ms |
48396 KB |
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
#define INF 1000000021
#define MOD 1000000007
#define pb push_back
#define sqr(a) (a)*(a)
#define M(a, b) make_pair(a,b)
#define T(a, b, c) make_pair(a, make_pair(b, c))
#define F first
#define S second
#define all(x) (x.begin(), x.end())
#define deb(x) cerr << #x << " = " << x << '\n'
#define N 522222
using namespace std;
//using namespace __gnu_pbds;
typedef long double ld;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
//typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
const ld pi = 2 * acos(0.0);
template<class T> bool umin(T& a, T b){if(a>b){a=b;return 1;}return 0;}
template<class T> bool umax(T& a, T b){if(a<b){a=b;return 1;}return 0;}
template<class T, class TT> bool pal(T a, TT n){int k=0;for(int i=0;i<=n/2;i++){if(a[i]!=a[n-i-1]){k=1;break;}}return k?0:1;}
//int month[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
vi v[N], l;
void dfs(int u, int e)
{
if(v[u].size() == 1)
l.pb(u);
for(auto it : v[u])
if(it != e)
dfs(it, u);
}
int main()
{
int n;
cin >> n;
for(int i = 2; i <= n; i ++)
{
int x, y;
cin >> x >> y;
v[x].pb(y);
v[y].pb(x);
}
dfs(1, 0);
cout << (l.size() + 1) / 2 << '\n';
for(int i = 0; i < (l.size() + 1) / 2; i ++)
cout << l[i] << ' ' << l[i + l.size()/2] << '\n';
getchar();
getchar();
return 0;
//ios::sync_with_stdio(false);
//cin.tie(0);
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:58:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < (l.size() + 1) / 2; i ++)
~~^~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 3 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 6 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 10 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 11 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 12 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 14 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 17 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12544 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 3 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 6 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 10 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 11 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 12 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 14 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 17 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12672 KB |
Output is correct |
| 22 |
Correct |
14 ms |
12732 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12792 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 27 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12644 KB |
Output is correct |
| 30 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 31 |
Correct |
14 ms |
12648 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 33 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 35 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 38 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12672 KB |
Output is correct |
| 43 |
Correct |
12 ms |
12672 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 49 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 54 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 55 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 56 |
Correct |
14 ms |
12544 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12672 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 3 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 6 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 10 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 11 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 12 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 14 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 17 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12672 KB |
Output is correct |
| 22 |
Correct |
14 ms |
12732 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 24 |
Correct |
14 ms |
12792 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 27 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12644 KB |
Output is correct |
| 30 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 31 |
Correct |
14 ms |
12648 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 33 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 35 |
Correct |
11 ms |
12544 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 38 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12672 KB |
Output is correct |
| 43 |
Correct |
12 ms |
12672 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 49 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12544 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 54 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 55 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 56 |
Correct |
14 ms |
12544 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12672 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12672 KB |
Output is correct |
| 59 |
Correct |
632 ms |
36620 KB |
Output is correct |
| 60 |
Correct |
789 ms |
39512 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 62 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 63 |
Correct |
552 ms |
34260 KB |
Output is correct |
| 64 |
Correct |
18 ms |
13048 KB |
Output is correct |
| 65 |
Correct |
38 ms |
14592 KB |
Output is correct |
| 66 |
Correct |
290 ms |
28540 KB |
Output is correct |
| 67 |
Correct |
855 ms |
47432 KB |
Output is correct |
| 68 |
Correct |
836 ms |
48396 KB |
Output is correct |
| 69 |
Correct |
27 ms |
13432 KB |
Output is correct |
| 70 |
Correct |
180 ms |
21840 KB |
Output is correct |
| 71 |
Correct |
586 ms |
42504 KB |
Output is correct |
| 72 |
Correct |
590 ms |
41316 KB |
Output is correct |
| 73 |
Correct |
178 ms |
19568 KB |
Output is correct |
| 74 |
Correct |
758 ms |
38384 KB |
Output is correct |
| 75 |
Correct |
63 ms |
15864 KB |
Output is correct |
| 76 |
Correct |
594 ms |
42064 KB |
Output is correct |
| 77 |
Correct |
566 ms |
42144 KB |
Output is correct |
| 78 |
Correct |
76 ms |
15992 KB |
Output is correct |
| 79 |
Correct |
810 ms |
45712 KB |
Output is correct |
| 80 |
Correct |
15 ms |
12800 KB |
Output is correct |
| 81 |
Correct |
205 ms |
21840 KB |
Output is correct |
| 82 |
Correct |
666 ms |
40168 KB |
Output is correct |
| 83 |
Correct |
744 ms |
38356 KB |
Output is correct |
| 84 |
Correct |
739 ms |
38132 KB |
Output is correct |
| 85 |
Correct |
740 ms |
38480 KB |
Output is correct |
| 86 |
Correct |
729 ms |
39248 KB |
Output is correct |
| 87 |
Correct |
732 ms |
39368 KB |
Output is correct |
