# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
655954 |
2022-11-06T07:27:30 Z |
ParsaS |
Network (BOI15_net) |
C++14 |
|
456 ms |
45388 KB |
// In the name of God
#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define mp make_pair
typedef long long ll;
const int N = 5e5 + 5, MOD = 1e9 + 7;
int n, tin[N], T;
vector<int> adj[N];
void dfs(int v, int p) {
tin[v] = ++T;
for (auto u : adj[v])
if (u != p)
dfs(u, v);
}
void solve() {
cin >> n;
for (int i = 0; i < n - 1; i++) {
int v, u; cin >> v >> u;
adj[v].pb(u), adj[u].pb(v);
}
int root = 1;
for (int i = 1; i <= n; i++) {
if (adj[i].size() >= 2)
root = i;
}
dfs(root, 0);
vector<pair<int, int> > vec, ans;
for (int i = 1; i <= n; i++) {
if (adj[i].size() == 1)
vec.pb(mp(tin[i], i));
}
sort(vec.begin(), vec.end());
if (vec.size() % 2) {
ans.pb(mp(vec.back().se, vec.front().se));
vec.pop_back();
}
for (int i = 0; i < vec.size() / 2; i++)
ans.pb(mp(vec[i].se, vec[i + vec.size() / 2].se));
cout << ans.size() << '\n';
for (auto [v, u] : ans)
cout << v << ' ' << u << '\n';
}
int32_t main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
solve();
return 0;
}
Compilation message
net.cpp: In function 'void solve()':
net.cpp:44:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for (int i = 0; i < vec.size() / 2; i++)
| ~~^~~~~~~~~~~~~~~~
net.cpp:47:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
47 | for (auto [v, u] : ans)
| ^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
6 ms |
11988 KB |
Output is correct |
3 |
Correct |
6 ms |
11988 KB |
Output is correct |
4 |
Correct |
8 ms |
11988 KB |
Output is correct |
5 |
Correct |
7 ms |
11968 KB |
Output is correct |
6 |
Correct |
6 ms |
12068 KB |
Output is correct |
7 |
Correct |
6 ms |
11988 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
7 ms |
11988 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
7 ms |
12076 KB |
Output is correct |
12 |
Correct |
7 ms |
12072 KB |
Output is correct |
13 |
Correct |
6 ms |
11988 KB |
Output is correct |
14 |
Correct |
7 ms |
11988 KB |
Output is correct |
15 |
Correct |
6 ms |
11988 KB |
Output is correct |
16 |
Correct |
6 ms |
11988 KB |
Output is correct |
17 |
Correct |
6 ms |
11996 KB |
Output is correct |
18 |
Correct |
6 ms |
12076 KB |
Output is correct |
19 |
Correct |
7 ms |
11960 KB |
Output is correct |
20 |
Correct |
7 ms |
12072 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
6 ms |
11988 KB |
Output is correct |
3 |
Correct |
6 ms |
11988 KB |
Output is correct |
4 |
Correct |
8 ms |
11988 KB |
Output is correct |
5 |
Correct |
7 ms |
11968 KB |
Output is correct |
6 |
Correct |
6 ms |
12068 KB |
Output is correct |
7 |
Correct |
6 ms |
11988 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
7 ms |
11988 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
7 ms |
12076 KB |
Output is correct |
12 |
Correct |
7 ms |
12072 KB |
Output is correct |
13 |
Correct |
6 ms |
11988 KB |
Output is correct |
14 |
Correct |
7 ms |
11988 KB |
Output is correct |
15 |
Correct |
6 ms |
11988 KB |
Output is correct |
16 |
Correct |
6 ms |
11988 KB |
Output is correct |
17 |
Correct |
6 ms |
11996 KB |
Output is correct |
18 |
Correct |
6 ms |
12076 KB |
Output is correct |
19 |
Correct |
7 ms |
11960 KB |
Output is correct |
20 |
Correct |
7 ms |
12072 KB |
Output is correct |
21 |
Correct |
6 ms |
11988 KB |
Output is correct |
22 |
Correct |
7 ms |
12152 KB |
Output is correct |
23 |
Correct |
7 ms |
12164 KB |
Output is correct |
24 |
Correct |
8 ms |
12116 KB |
Output is correct |
25 |
Correct |
7 ms |
12116 KB |
Output is correct |
26 |
Correct |
9 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12116 KB |
Output is correct |
28 |
Correct |
7 ms |
12132 KB |
Output is correct |
29 |
Correct |
8 ms |
12116 KB |
Output is correct |
30 |
Correct |
7 ms |
11988 KB |
Output is correct |
31 |
Correct |
7 ms |
12116 KB |
Output is correct |
32 |
Correct |
7 ms |
11988 KB |
Output is correct |
33 |
Correct |
6 ms |
11988 KB |
Output is correct |
34 |
Correct |
6 ms |
11988 KB |
Output is correct |
35 |
Correct |
6 ms |
12080 KB |
Output is correct |
36 |
Correct |
7 ms |
12072 KB |
Output is correct |
37 |
Correct |
6 ms |
11988 KB |
Output is correct |
38 |
Correct |
6 ms |
12116 KB |
Output is correct |
39 |
Correct |
7 ms |
11988 KB |
Output is correct |
40 |
Correct |
7 ms |
11956 KB |
Output is correct |
41 |
Correct |
7 ms |
11988 KB |
Output is correct |
42 |
Correct |
8 ms |
11988 KB |
Output is correct |
43 |
Correct |
7 ms |
12116 KB |
Output is correct |
44 |
Correct |
6 ms |
12072 KB |
Output is correct |
45 |
Correct |
7 ms |
11988 KB |
Output is correct |
46 |
Correct |
7 ms |
12116 KB |
Output is correct |
47 |
Correct |
7 ms |
11988 KB |
Output is correct |
48 |
Correct |
7 ms |
12072 KB |
Output is correct |
49 |
Correct |
7 ms |
12076 KB |
Output is correct |
50 |
Correct |
8 ms |
11988 KB |
Output is correct |
51 |
Correct |
7 ms |
12040 KB |
Output is correct |
52 |
Correct |
6 ms |
12076 KB |
Output is correct |
53 |
Correct |
7 ms |
12116 KB |
Output is correct |
54 |
Correct |
6 ms |
11988 KB |
Output is correct |
55 |
Correct |
7 ms |
11988 KB |
Output is correct |
56 |
Correct |
6 ms |
11988 KB |
Output is correct |
57 |
Correct |
6 ms |
12072 KB |
Output is correct |
58 |
Correct |
7 ms |
12116 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
6 ms |
11988 KB |
Output is correct |
3 |
Correct |
6 ms |
11988 KB |
Output is correct |
4 |
Correct |
8 ms |
11988 KB |
Output is correct |
5 |
Correct |
7 ms |
11968 KB |
Output is correct |
6 |
Correct |
6 ms |
12068 KB |
Output is correct |
7 |
Correct |
6 ms |
11988 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
7 ms |
11988 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
7 ms |
12076 KB |
Output is correct |
12 |
Correct |
7 ms |
12072 KB |
Output is correct |
13 |
Correct |
6 ms |
11988 KB |
Output is correct |
14 |
Correct |
7 ms |
11988 KB |
Output is correct |
15 |
Correct |
6 ms |
11988 KB |
Output is correct |
16 |
Correct |
6 ms |
11988 KB |
Output is correct |
17 |
Correct |
6 ms |
11996 KB |
Output is correct |
18 |
Correct |
6 ms |
12076 KB |
Output is correct |
19 |
Correct |
7 ms |
11960 KB |
Output is correct |
20 |
Correct |
7 ms |
12072 KB |
Output is correct |
21 |
Correct |
6 ms |
11988 KB |
Output is correct |
22 |
Correct |
7 ms |
12152 KB |
Output is correct |
23 |
Correct |
7 ms |
12164 KB |
Output is correct |
24 |
Correct |
8 ms |
12116 KB |
Output is correct |
25 |
Correct |
7 ms |
12116 KB |
Output is correct |
26 |
Correct |
9 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12116 KB |
Output is correct |
28 |
Correct |
7 ms |
12132 KB |
Output is correct |
29 |
Correct |
8 ms |
12116 KB |
Output is correct |
30 |
Correct |
7 ms |
11988 KB |
Output is correct |
31 |
Correct |
7 ms |
12116 KB |
Output is correct |
32 |
Correct |
7 ms |
11988 KB |
Output is correct |
33 |
Correct |
6 ms |
11988 KB |
Output is correct |
34 |
Correct |
6 ms |
11988 KB |
Output is correct |
35 |
Correct |
6 ms |
12080 KB |
Output is correct |
36 |
Correct |
7 ms |
12072 KB |
Output is correct |
37 |
Correct |
6 ms |
11988 KB |
Output is correct |
38 |
Correct |
6 ms |
12116 KB |
Output is correct |
39 |
Correct |
7 ms |
11988 KB |
Output is correct |
40 |
Correct |
7 ms |
11956 KB |
Output is correct |
41 |
Correct |
7 ms |
11988 KB |
Output is correct |
42 |
Correct |
8 ms |
11988 KB |
Output is correct |
43 |
Correct |
7 ms |
12116 KB |
Output is correct |
44 |
Correct |
6 ms |
12072 KB |
Output is correct |
45 |
Correct |
7 ms |
11988 KB |
Output is correct |
46 |
Correct |
7 ms |
12116 KB |
Output is correct |
47 |
Correct |
7 ms |
11988 KB |
Output is correct |
48 |
Correct |
7 ms |
12072 KB |
Output is correct |
49 |
Correct |
7 ms |
12076 KB |
Output is correct |
50 |
Correct |
8 ms |
11988 KB |
Output is correct |
51 |
Correct |
7 ms |
12040 KB |
Output is correct |
52 |
Correct |
6 ms |
12076 KB |
Output is correct |
53 |
Correct |
7 ms |
12116 KB |
Output is correct |
54 |
Correct |
6 ms |
11988 KB |
Output is correct |
55 |
Correct |
7 ms |
11988 KB |
Output is correct |
56 |
Correct |
6 ms |
11988 KB |
Output is correct |
57 |
Correct |
6 ms |
12072 KB |
Output is correct |
58 |
Correct |
7 ms |
12116 KB |
Output is correct |
59 |
Correct |
332 ms |
38540 KB |
Output is correct |
60 |
Correct |
441 ms |
41108 KB |
Output is correct |
61 |
Correct |
7 ms |
11988 KB |
Output is correct |
62 |
Correct |
7 ms |
11988 KB |
Output is correct |
63 |
Correct |
299 ms |
36504 KB |
Output is correct |
64 |
Correct |
9 ms |
12364 KB |
Output is correct |
65 |
Correct |
16 ms |
13524 KB |
Output is correct |
66 |
Correct |
122 ms |
23028 KB |
Output is correct |
67 |
Correct |
427 ms |
43488 KB |
Output is correct |
68 |
Correct |
416 ms |
40652 KB |
Output is correct |
69 |
Correct |
13 ms |
13012 KB |
Output is correct |
70 |
Correct |
83 ms |
23912 KB |
Output is correct |
71 |
Correct |
305 ms |
45388 KB |
Output is correct |
72 |
Correct |
313 ms |
44452 KB |
Output is correct |
73 |
Correct |
88 ms |
20460 KB |
Output is correct |
74 |
Correct |
396 ms |
38364 KB |
Output is correct |
75 |
Correct |
32 ms |
15948 KB |
Output is correct |
76 |
Correct |
300 ms |
44928 KB |
Output is correct |
77 |
Correct |
307 ms |
45172 KB |
Output is correct |
78 |
Correct |
27 ms |
15240 KB |
Output is correct |
79 |
Correct |
406 ms |
36964 KB |
Output is correct |
80 |
Correct |
9 ms |
12244 KB |
Output is correct |
81 |
Correct |
97 ms |
23188 KB |
Output is correct |
82 |
Correct |
357 ms |
42108 KB |
Output is correct |
83 |
Correct |
401 ms |
38016 KB |
Output is correct |
84 |
Correct |
454 ms |
38176 KB |
Output is correct |
85 |
Correct |
431 ms |
38024 KB |
Output is correct |
86 |
Correct |
449 ms |
40760 KB |
Output is correct |
87 |
Correct |
456 ms |
40560 KB |
Output is correct |