# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
606815 | 2022-07-26T08:41:37 Z | ThMinh_ | Network (BOI15_net) | C++14 | 672 ms | 239644 KB |
#include<bits/stdc++.h> #define forin(i,a,b) for(int i=a;i<=b;++i) #define forv(a,b) for(auto &a:b) #define ii pair<int, int> using namespace std; const int N = 5e5+10; int n, root; int color[N]; vector<int> adj[N]; vector<ii> ans; queue<int> dfs(int u) { color[u] = 1; queue<int> res; if(adj[u].size() == 1) {res.push(u); return res;} forv(v, adj[u]) if(!color[v]) { queue<int> q = dfs(v); if(res.size() + q.size() > 2 && res.size() > 0 && q.size() > 0) { ans.push_back({res.front(), q.front()}); res.pop(); q.pop(); } while(!q.empty()) {res.push(q.front()); q.pop();} } return res; } int main () { cin.tie(0)->sync_with_stdio(0); if(fopen("Task.inp","r")) { freopen("Task.inp","r",stdin); freopen("WA.out","w",stdout); } cin>>n; forin(i,1,n - 1) { int u, v; cin>>u>>v; adj[u].push_back(v); adj[v].push_back(u); } queue<int> slt; forin(i,1,n) if(adj[i].size() > 1) {slt = dfs(i); root = i; break;} if(slt.size() == 2) {root = slt.front(); slt.pop();} if(slt.size() == 1) ans.push_back({root, slt.front()}); cout<<ans.size()<<"\n"; forv(v, ans) cout<<v.first<<" "<<v.second<<"\n"; }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 11996 KB | Output is correct |
2 | Correct | 7 ms | 12068 KB | Output is correct |
3 | Correct | 6 ms | 12052 KB | Output is correct |
4 | Correct | 8 ms | 11988 KB | Output is correct |
5 | Correct | 9 ms | 12032 KB | Output is correct |
6 | Correct | 6 ms | 12044 KB | Output is correct |
7 | Correct | 6 ms | 12008 KB | Output is correct |
8 | Correct | 8 ms | 11988 KB | Output is correct |
9 | Correct | 8 ms | 11988 KB | Output is correct |
10 | Correct | 9 ms | 11972 KB | Output is correct |
11 | Correct | 11 ms | 11988 KB | Output is correct |
12 | Correct | 6 ms | 11988 KB | Output is correct |
13 | Correct | 7 ms | 11988 KB | Output is correct |
14 | Correct | 6 ms | 11988 KB | Output is correct |
15 | Correct | 5 ms | 11988 KB | Output is correct |
16 | Correct | 6 ms | 12036 KB | Output is correct |
17 | Correct | 7 ms | 11988 KB | Output is correct |
18 | Correct | 6 ms | 11952 KB | Output is correct |
19 | Correct | 6 ms | 11988 KB | Output is correct |
20 | Correct | 11 ms | 11992 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 11996 KB | Output is correct |
2 | Correct | 7 ms | 12068 KB | Output is correct |
3 | Correct | 6 ms | 12052 KB | Output is correct |
4 | Correct | 8 ms | 11988 KB | Output is correct |
5 | Correct | 9 ms | 12032 KB | Output is correct |
6 | Correct | 6 ms | 12044 KB | Output is correct |
7 | Correct | 6 ms | 12008 KB | Output is correct |
8 | Correct | 8 ms | 11988 KB | Output is correct |
9 | Correct | 8 ms | 11988 KB | Output is correct |
10 | Correct | 9 ms | 11972 KB | Output is correct |
11 | Correct | 11 ms | 11988 KB | Output is correct |
12 | Correct | 6 ms | 11988 KB | Output is correct |
13 | Correct | 7 ms | 11988 KB | Output is correct |
14 | Correct | 6 ms | 11988 KB | Output is correct |
15 | Correct | 5 ms | 11988 KB | Output is correct |
16 | Correct | 6 ms | 12036 KB | Output is correct |
17 | Correct | 7 ms | 11988 KB | Output is correct |
18 | Correct | 6 ms | 11952 KB | Output is correct |
19 | Correct | 6 ms | 11988 KB | Output is correct |
20 | Correct | 11 ms | 11992 KB | Output is correct |
21 | Correct | 6 ms | 11972 KB | Output is correct |
22 | Correct | 9 ms | 12116 KB | Output is correct |
23 | Correct | 9 ms | 12180 KB | Output is correct |
24 | Correct | 7 ms | 12116 KB | Output is correct |
25 | Correct | 7 ms | 12096 KB | Output is correct |
26 | Correct | 10 ms | 12116 KB | Output is correct |
27 | Correct | 9 ms | 12116 KB | Output is correct |
28 | Correct | 9 ms | 12152 KB | Output is correct |
29 | Correct | 8 ms | 12116 KB | Output is correct |
30 | Correct | 17 ms | 12012 KB | Output is correct |
31 | Correct | 7 ms | 12116 KB | Output is correct |
32 | Correct | 6 ms | 11988 KB | Output is correct |
33 | Correct | 8 ms | 11988 KB | Output is correct |
34 | Correct | 9 ms | 12048 KB | Output is correct |
35 | Correct | 8 ms | 11988 KB | Output is correct |
36 | Correct | 7 ms | 11988 KB | Output is correct |
37 | Correct | 9 ms | 12372 KB | Output is correct |
38 | Correct | 9 ms | 12660 KB | Output is correct |
39 | Correct | 7 ms | 12060 KB | Output is correct |
40 | Correct | 9 ms | 11988 KB | Output is correct |
41 | Correct | 9 ms | 11988 KB | Output is correct |
42 | Correct | 10 ms | 12060 KB | Output is correct |
43 | Correct | 8 ms | 12116 KB | Output is correct |
44 | Correct | 8 ms | 11988 KB | Output is correct |
45 | Correct | 7 ms | 11980 KB | Output is correct |
46 | Correct | 7 ms | 12072 KB | Output is correct |
47 | Correct | 8 ms | 11988 KB | Output is correct |
48 | Correct | 9 ms | 11988 KB | Output is correct |
49 | Correct | 7 ms | 12000 KB | Output is correct |
50 | Correct | 8 ms | 11988 KB | Output is correct |
51 | Correct | 6 ms | 11988 KB | Output is correct |
52 | Correct | 6 ms | 12116 KB | Output is correct |
53 | Correct | 7 ms | 12244 KB | Output is correct |
54 | Correct | 6 ms | 12004 KB | Output is correct |
55 | Correct | 8 ms | 12020 KB | Output is correct |
56 | Correct | 6 ms | 11988 KB | Output is correct |
57 | Correct | 8 ms | 11988 KB | Output is correct |
58 | Correct | 7 ms | 12080 KB | Output is correct |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 8 ms | 11996 KB | Output is correct |
2 | Correct | 7 ms | 12068 KB | Output is correct |
3 | Correct | 6 ms | 12052 KB | Output is correct |
4 | Correct | 8 ms | 11988 KB | Output is correct |
5 | Correct | 9 ms | 12032 KB | Output is correct |
6 | Correct | 6 ms | 12044 KB | Output is correct |
7 | Correct | 6 ms | 12008 KB | Output is correct |
8 | Correct | 8 ms | 11988 KB | Output is correct |
9 | Correct | 8 ms | 11988 KB | Output is correct |
10 | Correct | 9 ms | 11972 KB | Output is correct |
11 | Correct | 11 ms | 11988 KB | Output is correct |
12 | Correct | 6 ms | 11988 KB | Output is correct |
13 | Correct | 7 ms | 11988 KB | Output is correct |
14 | Correct | 6 ms | 11988 KB | Output is correct |
15 | Correct | 5 ms | 11988 KB | Output is correct |
16 | Correct | 6 ms | 12036 KB | Output is correct |
17 | Correct | 7 ms | 11988 KB | Output is correct |
18 | Correct | 6 ms | 11952 KB | Output is correct |
19 | Correct | 6 ms | 11988 KB | Output is correct |
20 | Correct | 11 ms | 11992 KB | Output is correct |
21 | Correct | 6 ms | 11972 KB | Output is correct |
22 | Correct | 9 ms | 12116 KB | Output is correct |
23 | Correct | 9 ms | 12180 KB | Output is correct |
24 | Correct | 7 ms | 12116 KB | Output is correct |
25 | Correct | 7 ms | 12096 KB | Output is correct |
26 | Correct | 10 ms | 12116 KB | Output is correct |
27 | Correct | 9 ms | 12116 KB | Output is correct |
28 | Correct | 9 ms | 12152 KB | Output is correct |
29 | Correct | 8 ms | 12116 KB | Output is correct |
30 | Correct | 17 ms | 12012 KB | Output is correct |
31 | Correct | 7 ms | 12116 KB | Output is correct |
32 | Correct | 6 ms | 11988 KB | Output is correct |
33 | Correct | 8 ms | 11988 KB | Output is correct |
34 | Correct | 9 ms | 12048 KB | Output is correct |
35 | Correct | 8 ms | 11988 KB | Output is correct |
36 | Correct | 7 ms | 11988 KB | Output is correct |
37 | Correct | 9 ms | 12372 KB | Output is correct |
38 | Correct | 9 ms | 12660 KB | Output is correct |
39 | Correct | 7 ms | 12060 KB | Output is correct |
40 | Correct | 9 ms | 11988 KB | Output is correct |
41 | Correct | 9 ms | 11988 KB | Output is correct |
42 | Correct | 10 ms | 12060 KB | Output is correct |
43 | Correct | 8 ms | 12116 KB | Output is correct |
44 | Correct | 8 ms | 11988 KB | Output is correct |
45 | Correct | 7 ms | 11980 KB | Output is correct |
46 | Correct | 7 ms | 12072 KB | Output is correct |
47 | Correct | 8 ms | 11988 KB | Output is correct |
48 | Correct | 9 ms | 11988 KB | Output is correct |
49 | Correct | 7 ms | 12000 KB | Output is correct |
50 | Correct | 8 ms | 11988 KB | Output is correct |
51 | Correct | 6 ms | 11988 KB | Output is correct |
52 | Correct | 6 ms | 12116 KB | Output is correct |
53 | Correct | 7 ms | 12244 KB | Output is correct |
54 | Correct | 6 ms | 12004 KB | Output is correct |
55 | Correct | 8 ms | 12020 KB | Output is correct |
56 | Correct | 6 ms | 11988 KB | Output is correct |
57 | Correct | 8 ms | 11988 KB | Output is correct |
58 | Correct | 7 ms | 12080 KB | Output is correct |
59 | Correct | 347 ms | 31728 KB | Output is correct |
60 | Correct | 486 ms | 34080 KB | Output is correct |
61 | Correct | 8 ms | 11988 KB | Output is correct |
62 | Correct | 8 ms | 11988 KB | Output is correct |
63 | Correct | 374 ms | 29804 KB | Output is correct |
64 | Correct | 10 ms | 16084 KB | Output is correct |
65 | Correct | 22 ms | 26788 KB | Output is correct |
66 | Correct | 202 ms | 148684 KB | Output is correct |
67 | Correct | 622 ms | 235472 KB | Output is correct |
68 | Correct | 672 ms | 239644 KB | Output is correct |
69 | Correct | 16 ms | 12884 KB | Output is correct |
70 | Correct | 129 ms | 20040 KB | Output is correct |
71 | Correct | 306 ms | 37372 KB | Output is correct |
72 | Correct | 326 ms | 36536 KB | Output is correct |
73 | Correct | 128 ms | 18148 KB | Output is correct |
74 | Correct | 499 ms | 33332 KB | Output is correct |
75 | Correct | 32 ms | 14956 KB | Output is correct |
76 | Correct | 355 ms | 37060 KB | Output is correct |
77 | Correct | 389 ms | 37316 KB | Output is correct |
78 | Correct | 49 ms | 29688 KB | Output is correct |
79 | Correct | 663 ms | 206976 KB | Output is correct |
80 | Correct | 9 ms | 12220 KB | Output is correct |
81 | Correct | 129 ms | 20080 KB | Output is correct |
82 | Correct | 482 ms | 35280 KB | Output is correct |
83 | Correct | 522 ms | 33384 KB | Output is correct |
84 | Correct | 534 ms | 33260 KB | Output is correct |
85 | Correct | 431 ms | 33208 KB | Output is correct |
86 | Correct | 456 ms | 34340 KB | Output is correct |
87 | Correct | 494 ms | 34380 KB | Output is correct |