| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 940120 |
2024-03-07T05:48:10 Z |
vjudge1 |
Network (BOI15_net) |
C++17 |
|
356 ms |
46168 KB |
// in the name of God
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define fast() ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ff first
#define ss second
#define pb(x) push_back(x)
#define all(x) x.begin(), x.end()
#define mk make_pair
#define ppb pop_back
#define endl '\n'
#define pii pair<int, int>
#define sz(x) (int)x.size()
#define file() freopen("input.txt", "r", stdin);
#pragma GCC optimize("Ofast")
#pragma GCC optimize("O4")
#pragma GCC optimize("unroll-loops")
//#pragma GCC target("avx2")
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int mod = 1e9 + 7, maxn = 5e5 + 10, sq = 3163, inf = 1e18 + 10, lg = 25, pp = 4447, modd = 1e9 + 9;
int n;
vector<vector<int>> g(maxn);
vector<int> b;
void dfs(int u = 0, int par = -1){
if(g[u].size() == 1) b.pb(u);
for(int v : g[u]){
if(v != par) dfs(v, u);
}
}
signed main(){
fast();//file();
cin >> n;
for(int i = 1; i < n; ++i){
int u, v; cin >> u >> v;
u--; v--;
g[v].pb(u);
g[u].pb(v);
}
dfs();
int ans = b.size() + 1;
ans /= 2;
cout << ans << endl;
for(int i = 0; i < (b.size() - (b.size() / 2)); ++i){
cout << b[i] + 1 << " " << b[i + (b.size() / 2)] + 1 << endl;
}
}
// Happiness can be found even in the darkest of times,
// if one only remembers to turn on the light.
Compilation message
net.cpp: In function 'int main()':
net.cpp:46:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | for(int i = 0; i < (b.size() - (b.size() / 2)); ++i){
| ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12092 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12276 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 6 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12100 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 20 |
Correct |
3 ms |
11980 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12092 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12276 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 6 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12100 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 20 |
Correct |
3 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 22 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 23 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 24 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 26 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 27 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 28 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 29 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 31 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 34 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 36 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 37 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 39 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 40 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12284 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 46 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 47 |
Correct |
4 ms |
12008 KB |
Output is correct |
| 48 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12136 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 52 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 54 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 57 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12092 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12276 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 6 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12100 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 20 |
Correct |
3 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 22 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 23 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 24 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 26 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 27 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 28 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 29 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 31 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 34 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 36 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 37 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 39 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 40 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12284 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 46 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 47 |
Correct |
4 ms |
12008 KB |
Output is correct |
| 48 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12136 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 52 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 54 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 57 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 59 |
Correct |
261 ms |
35992 KB |
Output is correct |
| 60 |
Correct |
261 ms |
37428 KB |
Output is correct |
| 61 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 62 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 63 |
Correct |
203 ms |
31932 KB |
Output is correct |
| 64 |
Correct |
6 ms |
12632 KB |
Output is correct |
| 65 |
Correct |
10 ms |
13892 KB |
Output is correct |
| 66 |
Correct |
66 ms |
28244 KB |
Output is correct |
| 67 |
Correct |
335 ms |
44412 KB |
Output is correct |
| 68 |
Correct |
356 ms |
46168 KB |
Output is correct |
| 69 |
Correct |
7 ms |
12892 KB |
Output is correct |
| 70 |
Correct |
53 ms |
21320 KB |
Output is correct |
| 71 |
Correct |
183 ms |
39256 KB |
Output is correct |
| 72 |
Correct |
186 ms |
38588 KB |
Output is correct |
| 73 |
Correct |
50 ms |
18376 KB |
Output is correct |
| 74 |
Correct |
268 ms |
34496 KB |
Output is correct |
| 75 |
Correct |
18 ms |
15060 KB |
Output is correct |
| 76 |
Correct |
218 ms |
38684 KB |
Output is correct |
| 77 |
Correct |
205 ms |
39196 KB |
Output is correct |
| 78 |
Correct |
20 ms |
15452 KB |
Output is correct |
| 79 |
Correct |
338 ms |
42068 KB |
Output is correct |
| 80 |
Correct |
4 ms |
12376 KB |
Output is correct |
| 81 |
Correct |
68 ms |
20388 KB |
Output is correct |
| 82 |
Correct |
265 ms |
36832 KB |
Output is correct |
| 83 |
Correct |
274 ms |
34500 KB |
Output is correct |
| 84 |
Correct |
260 ms |
34688 KB |
Output is correct |
| 85 |
Correct |
285 ms |
34496 KB |
Output is correct |
| 86 |
Correct |
301 ms |
37492 KB |
Output is correct |
| 87 |
Correct |
280 ms |
37496 KB |
Output is correct |
