# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
151228 | 2019-09-02T09:26:07 Z | Charis02 | Network (BOI15_net) | C++14 | 18 ms | 14712 KB |
#include<iostream> #include<stdio.h> #include<vector> #include<cmath> #include<queue> #include<string.h> #include<map> #include<set> #include<algorithm> #define ll long long #define pi pair < ll,ll > #define mp(a,b) make_pair(a,b) #define rep(i,a,b) for(int i = a;i < b;i++) #define N 300004 #define INF 1e9+7 using namespace std; ll n,a,b; vector < vector < ll > > graph(N); vector < ll > res; void dfs(ll cur,ll par) { if(graph[cur].size() == 1) { res.push_back(cur); } rep(i,0,graph[cur].size()) { if(graph[cur][i] == par) continue; dfs(graph[cur][i],cur); } return; } int main() { ios_base::sync_with_stdio(false); cin >> n; rep(i,0,n-1) { cin >> a >> b; graph[a].push_back(b); graph[b].push_back(a); } dfs(1,1); ll half = res.size()/2 + res.size()%2; ll sz = res.size(); cout << half << endl; rep(i,0,half) { cout << res[i] << " "<< res[(i+half)%sz] << "\n"; } return 0; }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 7416 KB | Output is correct |
2 | Correct | 8 ms | 7416 KB | Output is correct |
3 | Correct | 8 ms | 7420 KB | Output is correct |
4 | Correct | 8 ms | 7420 KB | Output is correct |
5 | Correct | 8 ms | 7416 KB | Output is correct |
6 | Correct | 8 ms | 7388 KB | Output is correct |
7 | Correct | 8 ms | 7416 KB | Output is correct |
8 | Correct | 8 ms | 7416 KB | Output is correct |
9 | Correct | 9 ms | 7416 KB | Output is correct |
10 | Correct | 8 ms | 7416 KB | Output is correct |
11 | Correct | 8 ms | 7416 KB | Output is correct |
12 | Correct | 8 ms | 7416 KB | Output is correct |
13 | Correct | 9 ms | 7416 KB | Output is correct |
14 | Correct | 8 ms | 7416 KB | Output is correct |
15 | Correct | 8 ms | 7416 KB | Output is correct |
16 | Correct | 8 ms | 7416 KB | Output is correct |
17 | Correct | 8 ms | 7416 KB | Output is correct |
18 | Correct | 8 ms | 7416 KB | Output is correct |
19 | Correct | 9 ms | 7416 KB | Output is correct |
20 | Correct | 7 ms | 7416 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 7416 KB | Output is correct |
2 | Correct | 8 ms | 7416 KB | Output is correct |
3 | Correct | 8 ms | 7420 KB | Output is correct |
4 | Correct | 8 ms | 7420 KB | Output is correct |
5 | Correct | 8 ms | 7416 KB | Output is correct |
6 | Correct | 8 ms | 7388 KB | Output is correct |
7 | Correct | 8 ms | 7416 KB | Output is correct |
8 | Correct | 8 ms | 7416 KB | Output is correct |
9 | Correct | 9 ms | 7416 KB | Output is correct |
10 | Correct | 8 ms | 7416 KB | Output is correct |
11 | Correct | 8 ms | 7416 KB | Output is correct |
12 | Correct | 8 ms | 7416 KB | Output is correct |
13 | Correct | 9 ms | 7416 KB | Output is correct |
14 | Correct | 8 ms | 7416 KB | Output is correct |
15 | Correct | 8 ms | 7416 KB | Output is correct |
16 | Correct | 8 ms | 7416 KB | Output is correct |
17 | Correct | 8 ms | 7416 KB | Output is correct |
18 | Correct | 8 ms | 7416 KB | Output is correct |
19 | Correct | 9 ms | 7416 KB | Output is correct |
20 | Correct | 7 ms | 7416 KB | Output is correct |
21 | Correct | 8 ms | 7416 KB | Output is correct |
22 | Correct | 9 ms | 7548 KB | Output is correct |
23 | Correct | 10 ms | 7544 KB | Output is correct |
24 | Correct | 9 ms | 7544 KB | Output is correct |
25 | Correct | 9 ms | 7544 KB | Output is correct |
26 | Correct | 9 ms | 7416 KB | Output is correct |
27 | Correct | 9 ms | 7544 KB | Output is correct |
28 | Correct | 9 ms | 7544 KB | Output is correct |
29 | Correct | 9 ms | 7416 KB | Output is correct |
30 | Correct | 9 ms | 7416 KB | Output is correct |
31 | Correct | 9 ms | 7544 KB | Output is correct |
32 | Correct | 8 ms | 7420 KB | Output is correct |
33 | Correct | 8 ms | 7416 KB | Output is correct |
34 | Correct | 8 ms | 7416 KB | Output is correct |
35 | Correct | 8 ms | 7416 KB | Output is correct |
36 | Correct | 8 ms | 7544 KB | Output is correct |
37 | Correct | 8 ms | 7416 KB | Output is correct |
38 | Correct | 9 ms | 7416 KB | Output is correct |
39 | Correct | 9 ms | 7416 KB | Output is correct |
40 | Correct | 9 ms | 7416 KB | Output is correct |
41 | Correct | 9 ms | 7416 KB | Output is correct |
42 | Correct | 8 ms | 7416 KB | Output is correct |
43 | Correct | 9 ms | 7416 KB | Output is correct |
44 | Correct | 10 ms | 7416 KB | Output is correct |
45 | Correct | 9 ms | 7416 KB | Output is correct |
46 | Correct | 8 ms | 7416 KB | Output is correct |
47 | Correct | 8 ms | 7416 KB | Output is correct |
48 | Correct | 8 ms | 7420 KB | Output is correct |
49 | Correct | 9 ms | 7416 KB | Output is correct |
50 | Correct | 8 ms | 7416 KB | Output is correct |
51 | Correct | 8 ms | 7416 KB | Output is correct |
52 | Correct | 8 ms | 7416 KB | Output is correct |
53 | Correct | 9 ms | 7544 KB | Output is correct |
54 | Correct | 8 ms | 7416 KB | Output is correct |
55 | Correct | 8 ms | 7416 KB | Output is correct |
56 | Correct | 8 ms | 7416 KB | Output is correct |
57 | Correct | 8 ms | 7416 KB | Output is correct |
58 | Correct | 9 ms | 7672 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 7416 KB | Output is correct |
2 | Correct | 8 ms | 7416 KB | Output is correct |
3 | Correct | 8 ms | 7420 KB | Output is correct |
4 | Correct | 8 ms | 7420 KB | Output is correct |
5 | Correct | 8 ms | 7416 KB | Output is correct |
6 | Correct | 8 ms | 7388 KB | Output is correct |
7 | Correct | 8 ms | 7416 KB | Output is correct |
8 | Correct | 8 ms | 7416 KB | Output is correct |
9 | Correct | 9 ms | 7416 KB | Output is correct |
10 | Correct | 8 ms | 7416 KB | Output is correct |
11 | Correct | 8 ms | 7416 KB | Output is correct |
12 | Correct | 8 ms | 7416 KB | Output is correct |
13 | Correct | 9 ms | 7416 KB | Output is correct |
14 | Correct | 8 ms | 7416 KB | Output is correct |
15 | Correct | 8 ms | 7416 KB | Output is correct |
16 | Correct | 8 ms | 7416 KB | Output is correct |
17 | Correct | 8 ms | 7416 KB | Output is correct |
18 | Correct | 8 ms | 7416 KB | Output is correct |
19 | Correct | 9 ms | 7416 KB | Output is correct |
20 | Correct | 7 ms | 7416 KB | Output is correct |
21 | Correct | 8 ms | 7416 KB | Output is correct |
22 | Correct | 9 ms | 7548 KB | Output is correct |
23 | Correct | 10 ms | 7544 KB | Output is correct |
24 | Correct | 9 ms | 7544 KB | Output is correct |
25 | Correct | 9 ms | 7544 KB | Output is correct |
26 | Correct | 9 ms | 7416 KB | Output is correct |
27 | Correct | 9 ms | 7544 KB | Output is correct |
28 | Correct | 9 ms | 7544 KB | Output is correct |
29 | Correct | 9 ms | 7416 KB | Output is correct |
30 | Correct | 9 ms | 7416 KB | Output is correct |
31 | Correct | 9 ms | 7544 KB | Output is correct |
32 | Correct | 8 ms | 7420 KB | Output is correct |
33 | Correct | 8 ms | 7416 KB | Output is correct |
34 | Correct | 8 ms | 7416 KB | Output is correct |
35 | Correct | 8 ms | 7416 KB | Output is correct |
36 | Correct | 8 ms | 7544 KB | Output is correct |
37 | Correct | 8 ms | 7416 KB | Output is correct |
38 | Correct | 9 ms | 7416 KB | Output is correct |
39 | Correct | 9 ms | 7416 KB | Output is correct |
40 | Correct | 9 ms | 7416 KB | Output is correct |
41 | Correct | 9 ms | 7416 KB | Output is correct |
42 | Correct | 8 ms | 7416 KB | Output is correct |
43 | Correct | 9 ms | 7416 KB | Output is correct |
44 | Correct | 10 ms | 7416 KB | Output is correct |
45 | Correct | 9 ms | 7416 KB | Output is correct |
46 | Correct | 8 ms | 7416 KB | Output is correct |
47 | Correct | 8 ms | 7416 KB | Output is correct |
48 | Correct | 8 ms | 7420 KB | Output is correct |
49 | Correct | 9 ms | 7416 KB | Output is correct |
50 | Correct | 8 ms | 7416 KB | Output is correct |
51 | Correct | 8 ms | 7416 KB | Output is correct |
52 | Correct | 8 ms | 7416 KB | Output is correct |
53 | Correct | 9 ms | 7544 KB | Output is correct |
54 | Correct | 8 ms | 7416 KB | Output is correct |
55 | Correct | 8 ms | 7416 KB | Output is correct |
56 | Correct | 8 ms | 7416 KB | Output is correct |
57 | Correct | 8 ms | 7416 KB | Output is correct |
58 | Correct | 9 ms | 7672 KB | Output is correct |
59 | Runtime error | 18 ms | 14712 KB | Execution killed with signal 11 (could be triggered by violating memory limits) |
60 | Halted | 0 ms | 0 KB | - |