# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
137107 | 2019-07-27T05:29:12 Z | silxikys | Network (BOI15_net) | C++14 | 2000 ms | 57680 KB |
#include <bits/stdc++.h> using namespace std; using ll = long long; const int maxn = 5e5+5; int n; vector<int> adj[maxn]; int deg[maxn]; int tin[maxn]; int pt = 0; void dfs(int i, int p) { tin[i] = pt++; for (int j: adj[i]) { if (j == p) continue; dfs(j,i); } } int main() { scanf("%d",&n); for (int i = 0; i < n - 1; i++) { int a, b; scanf("%d %d",&a,&b); ++deg[a]; ++deg[b]; adj[a].push_back(b); adj[b].push_back(a); } vector<int> leafs; leafs.reserve(n); int start = 1; for (int i = 1; i <= n; i++) { if (deg[i] == 1) leafs.push_back(i); if (deg[i] > 1) { start = i; } } for (int j: adj[start]) { dfs(j,j); } sort(leafs.begin(),leafs.end(),[&](auto a, auto b) { return tin[a] < tin[b]; }); int k = leafs.size(); int m = k/2; printf("%d\n",(k+1)/2); for (int i = 0; i < (k+1)/2; i++) { printf("%d %d\n",leafs[i],leafs[(i+m)%k]); } }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 12 ms | 12152 KB | Output is correct |
2 | Correct | 13 ms | 12152 KB | Output is correct |
3 | Correct | 12 ms | 12152 KB | Output is correct |
4 | Correct | 12 ms | 12152 KB | Output is correct |
5 | Correct | 13 ms | 12152 KB | Output is correct |
6 | Correct | 13 ms | 12024 KB | Output is correct |
7 | Correct | 13 ms | 12028 KB | Output is correct |
8 | Correct | 13 ms | 12152 KB | Output is correct |
9 | Correct | 12 ms | 12156 KB | Output is correct |
10 | Correct | 13 ms | 12152 KB | Output is correct |
11 | Correct | 13 ms | 12152 KB | Output is correct |
12 | Correct | 13 ms | 12152 KB | Output is correct |
13 | Correct | 12 ms | 12020 KB | Output is correct |
14 | Correct | 12 ms | 12152 KB | Output is correct |
15 | Correct | 13 ms | 12152 KB | Output is correct |
16 | Correct | 13 ms | 12152 KB | Output is correct |
17 | Correct | 12 ms | 12024 KB | Output is correct |
18 | Correct | 13 ms | 12152 KB | Output is correct |
19 | Correct | 12 ms | 12024 KB | Output is correct |
20 | Correct | 12 ms | 12152 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 12 ms | 12152 KB | Output is correct |
2 | Correct | 13 ms | 12152 KB | Output is correct |
3 | Correct | 12 ms | 12152 KB | Output is correct |
4 | Correct | 12 ms | 12152 KB | Output is correct |
5 | Correct | 13 ms | 12152 KB | Output is correct |
6 | Correct | 13 ms | 12024 KB | Output is correct |
7 | Correct | 13 ms | 12028 KB | Output is correct |
8 | Correct | 13 ms | 12152 KB | Output is correct |
9 | Correct | 12 ms | 12156 KB | Output is correct |
10 | Correct | 13 ms | 12152 KB | Output is correct |
11 | Correct | 13 ms | 12152 KB | Output is correct |
12 | Correct | 13 ms | 12152 KB | Output is correct |
13 | Correct | 12 ms | 12020 KB | Output is correct |
14 | Correct | 12 ms | 12152 KB | Output is correct |
15 | Correct | 13 ms | 12152 KB | Output is correct |
16 | Correct | 13 ms | 12152 KB | Output is correct |
17 | Correct | 12 ms | 12024 KB | Output is correct |
18 | Correct | 13 ms | 12152 KB | Output is correct |
19 | Correct | 12 ms | 12024 KB | Output is correct |
20 | Correct | 12 ms | 12152 KB | Output is correct |
21 | Correct | 12 ms | 12124 KB | Output is correct |
22 | Correct | 27 ms | 12280 KB | Output is correct |
23 | Correct | 14 ms | 12280 KB | Output is correct |
24 | Correct | 37 ms | 12152 KB | Output is correct |
25 | Correct | 14 ms | 12280 KB | Output is correct |
26 | Correct | 14 ms | 12152 KB | Output is correct |
27 | Correct | 15 ms | 12296 KB | Output is correct |
28 | Correct | 14 ms | 12152 KB | Output is correct |
29 | Correct | 14 ms | 12152 KB | Output is correct |
30 | Correct | 12 ms | 12024 KB | Output is correct |
31 | Correct | 14 ms | 12152 KB | Output is correct |
32 | Correct | 13 ms | 12152 KB | Output is correct |
33 | Correct | 12 ms | 12028 KB | Output is correct |
34 | Correct | 15 ms | 12152 KB | Output is correct |
35 | Correct | 14 ms | 12280 KB | Output is correct |
36 | Correct | 13 ms | 12024 KB | Output is correct |
37 | Correct | 14 ms | 12160 KB | Output is correct |
38 | Correct | 14 ms | 12152 KB | Output is correct |
39 | Correct | 13 ms | 12152 KB | Output is correct |
40 | Correct | 13 ms | 12152 KB | Output is correct |
41 | Correct | 13 ms | 12024 KB | Output is correct |
42 | Correct | 13 ms | 12024 KB | Output is correct |
43 | Correct | 13 ms | 12152 KB | Output is correct |
44 | Correct | 12 ms | 12152 KB | Output is correct |
45 | Correct | 13 ms | 12024 KB | Output is correct |
46 | Correct | 13 ms | 12152 KB | Output is correct |
47 | Correct | 12 ms | 12028 KB | Output is correct |
48 | Correct | 13 ms | 12152 KB | Output is correct |
49 | Correct | 13 ms | 12152 KB | Output is correct |
50 | Correct | 13 ms | 12104 KB | Output is correct |
51 | Correct | 13 ms | 12024 KB | Output is correct |
52 | Correct | 12 ms | 12152 KB | Output is correct |
53 | Correct | 13 ms | 12248 KB | Output is correct |
54 | Correct | 13 ms | 12152 KB | Output is correct |
55 | Correct | 13 ms | 12024 KB | Output is correct |
56 | Correct | 12 ms | 12152 KB | Output is correct |
57 | Correct | 13 ms | 12152 KB | Output is correct |
58 | Correct | 23 ms | 12152 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 12 ms | 12152 KB | Output is correct |
2 | Correct | 13 ms | 12152 KB | Output is correct |
3 | Correct | 12 ms | 12152 KB | Output is correct |
4 | Correct | 12 ms | 12152 KB | Output is correct |
5 | Correct | 13 ms | 12152 KB | Output is correct |
6 | Correct | 13 ms | 12024 KB | Output is correct |
7 | Correct | 13 ms | 12028 KB | Output is correct |
8 | Correct | 13 ms | 12152 KB | Output is correct |
9 | Correct | 12 ms | 12156 KB | Output is correct |
10 | Correct | 13 ms | 12152 KB | Output is correct |
11 | Correct | 13 ms | 12152 KB | Output is correct |
12 | Correct | 13 ms | 12152 KB | Output is correct |
13 | Correct | 12 ms | 12020 KB | Output is correct |
14 | Correct | 12 ms | 12152 KB | Output is correct |
15 | Correct | 13 ms | 12152 KB | Output is correct |
16 | Correct | 13 ms | 12152 KB | Output is correct |
17 | Correct | 12 ms | 12024 KB | Output is correct |
18 | Correct | 13 ms | 12152 KB | Output is correct |
19 | Correct | 12 ms | 12024 KB | Output is correct |
20 | Correct | 12 ms | 12152 KB | Output is correct |
21 | Correct | 12 ms | 12124 KB | Output is correct |
22 | Correct | 27 ms | 12280 KB | Output is correct |
23 | Correct | 14 ms | 12280 KB | Output is correct |
24 | Correct | 37 ms | 12152 KB | Output is correct |
25 | Correct | 14 ms | 12280 KB | Output is correct |
26 | Correct | 14 ms | 12152 KB | Output is correct |
27 | Correct | 15 ms | 12296 KB | Output is correct |
28 | Correct | 14 ms | 12152 KB | Output is correct |
29 | Correct | 14 ms | 12152 KB | Output is correct |
30 | Correct | 12 ms | 12024 KB | Output is correct |
31 | Correct | 14 ms | 12152 KB | Output is correct |
32 | Correct | 13 ms | 12152 KB | Output is correct |
33 | Correct | 12 ms | 12028 KB | Output is correct |
34 | Correct | 15 ms | 12152 KB | Output is correct |
35 | Correct | 14 ms | 12280 KB | Output is correct |
36 | Correct | 13 ms | 12024 KB | Output is correct |
37 | Correct | 14 ms | 12160 KB | Output is correct |
38 | Correct | 14 ms | 12152 KB | Output is correct |
39 | Correct | 13 ms | 12152 KB | Output is correct |
40 | Correct | 13 ms | 12152 KB | Output is correct |
41 | Correct | 13 ms | 12024 KB | Output is correct |
42 | Correct | 13 ms | 12024 KB | Output is correct |
43 | Correct | 13 ms | 12152 KB | Output is correct |
44 | Correct | 12 ms | 12152 KB | Output is correct |
45 | Correct | 13 ms | 12024 KB | Output is correct |
46 | Correct | 13 ms | 12152 KB | Output is correct |
47 | Correct | 12 ms | 12028 KB | Output is correct |
48 | Correct | 13 ms | 12152 KB | Output is correct |
49 | Correct | 13 ms | 12152 KB | Output is correct |
50 | Correct | 13 ms | 12104 KB | Output is correct |
51 | Correct | 13 ms | 12024 KB | Output is correct |
52 | Correct | 12 ms | 12152 KB | Output is correct |
53 | Correct | 13 ms | 12248 KB | Output is correct |
54 | Correct | 13 ms | 12152 KB | Output is correct |
55 | Correct | 13 ms | 12024 KB | Output is correct |
56 | Correct | 12 ms | 12152 KB | Output is correct |
57 | Correct | 13 ms | 12152 KB | Output is correct |
58 | Correct | 23 ms | 12152 KB | Output is correct |
59 | Correct | 573 ms | 36196 KB | Output is correct |
60 | Correct | 670 ms | 38456 KB | Output is correct |
61 | Correct | 13 ms | 12152 KB | Output is correct |
62 | Correct | 13 ms | 12152 KB | Output is correct |
63 | Correct | 511 ms | 33964 KB | Output is correct |
64 | Correct | 15 ms | 12540 KB | Output is correct |
65 | Correct | 28 ms | 13944 KB | Output is correct |
66 | Correct | 217 ms | 26588 KB | Output is correct |
67 | Correct | 706 ms | 57680 KB | Output is correct |
68 | Correct | 844 ms | 50252 KB | Output is correct |
69 | Correct | 22 ms | 12920 KB | Output is correct |
70 | Correct | 142 ms | 22364 KB | Output is correct |
71 | Execution timed out | 2068 ms | 38248 KB | Time limit exceeded |
72 | Halted | 0 ms | 0 KB | - |