# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
547970 |
2022-04-12T05:20:17 Z |
Soumya1 |
Network (BOI15_net) |
C++17 |
|
476 ms |
53932 KB |
#include <bits/stdc++.h>
#ifdef __LOCAL__
#include <debug_local.h>
#endif
using namespace std;
const int mxN = 5e5 + 5;
vector<int> ad[mxN];
int in[mxN];
vector<int> leafs;
int timer;
void dfs(int u, int p) {
int childs = 0;
in[u] = ++timer;
for (int v : ad[u]) {
if (v == p) continue;
dfs(v, u);
childs++;
}
if (!childs) {
leafs.push_back(u);
}
}
void testCase() {
int n;
cin >> n;
for (int i = 1; i < n; i++) {
int u, v;
cin >> u >> v;
ad[u].push_back(v);
ad[v].push_back(u);
}
for (int i = 1; i <= n; i++) {
if ((int) ad[i].size() > 1) {
dfs(i, -1);
break;
}
}
sort(leafs.begin(), leafs.end(), [&](int i, int j) { return in[i] < in[j]; });
cout << (int) (leafs.size() + 1) / 2 << "\n";
for (int i = 0; i < (int) (leafs.size() + 1) / 2; i++) {
int j = (int) leafs.size() / 2 + i;
cout << leafs[i] << " " << leafs[j] << "\n";
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
testCase();
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
8 ms |
12068 KB |
Output is correct |
3 |
Correct |
6 ms |
11988 KB |
Output is correct |
4 |
Correct |
7 ms |
11988 KB |
Output is correct |
5 |
Correct |
7 ms |
12072 KB |
Output is correct |
6 |
Correct |
6 ms |
11988 KB |
Output is correct |
7 |
Correct |
8 ms |
12164 KB |
Output is correct |
8 |
Correct |
8 ms |
11988 KB |
Output is correct |
9 |
Correct |
7 ms |
11988 KB |
Output is correct |
10 |
Correct |
8 ms |
12068 KB |
Output is correct |
11 |
Correct |
6 ms |
12072 KB |
Output is correct |
12 |
Correct |
7 ms |
12072 KB |
Output is correct |
13 |
Correct |
8 ms |
11988 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
7 ms |
11988 KB |
Output is correct |
16 |
Correct |
7 ms |
11948 KB |
Output is correct |
17 |
Correct |
7 ms |
11988 KB |
Output is correct |
18 |
Correct |
8 ms |
12072 KB |
Output is correct |
19 |
Correct |
7 ms |
12068 KB |
Output is correct |
20 |
Correct |
7 ms |
11988 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
8 ms |
12068 KB |
Output is correct |
3 |
Correct |
6 ms |
11988 KB |
Output is correct |
4 |
Correct |
7 ms |
11988 KB |
Output is correct |
5 |
Correct |
7 ms |
12072 KB |
Output is correct |
6 |
Correct |
6 ms |
11988 KB |
Output is correct |
7 |
Correct |
8 ms |
12164 KB |
Output is correct |
8 |
Correct |
8 ms |
11988 KB |
Output is correct |
9 |
Correct |
7 ms |
11988 KB |
Output is correct |
10 |
Correct |
8 ms |
12068 KB |
Output is correct |
11 |
Correct |
6 ms |
12072 KB |
Output is correct |
12 |
Correct |
7 ms |
12072 KB |
Output is correct |
13 |
Correct |
8 ms |
11988 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
7 ms |
11988 KB |
Output is correct |
16 |
Correct |
7 ms |
11948 KB |
Output is correct |
17 |
Correct |
7 ms |
11988 KB |
Output is correct |
18 |
Correct |
8 ms |
12072 KB |
Output is correct |
19 |
Correct |
7 ms |
12068 KB |
Output is correct |
20 |
Correct |
7 ms |
11988 KB |
Output is correct |
21 |
Correct |
7 ms |
12068 KB |
Output is correct |
22 |
Correct |
7 ms |
12148 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
7 ms |
12116 KB |
Output is correct |
25 |
Correct |
7 ms |
12116 KB |
Output is correct |
26 |
Correct |
8 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12176 KB |
Output is correct |
28 |
Correct |
7 ms |
12084 KB |
Output is correct |
29 |
Correct |
7 ms |
12116 KB |
Output is correct |
30 |
Correct |
7 ms |
12076 KB |
Output is correct |
31 |
Correct |
7 ms |
12116 KB |
Output is correct |
32 |
Correct |
7 ms |
11988 KB |
Output is correct |
33 |
Correct |
7 ms |
11988 KB |
Output is correct |
34 |
Correct |
7 ms |
12068 KB |
Output is correct |
35 |
Correct |
7 ms |
11988 KB |
Output is correct |
36 |
Correct |
6 ms |
11988 KB |
Output is correct |
37 |
Correct |
7 ms |
12116 KB |
Output is correct |
38 |
Correct |
7 ms |
12116 KB |
Output is correct |
39 |
Correct |
7 ms |
12068 KB |
Output is correct |
40 |
Correct |
7 ms |
11988 KB |
Output is correct |
41 |
Correct |
7 ms |
12072 KB |
Output is correct |
42 |
Correct |
6 ms |
11988 KB |
Output is correct |
43 |
Correct |
6 ms |
12116 KB |
Output is correct |
44 |
Correct |
6 ms |
11988 KB |
Output is correct |
45 |
Correct |
7 ms |
11988 KB |
Output is correct |
46 |
Correct |
7 ms |
12076 KB |
Output is correct |
47 |
Correct |
6 ms |
11988 KB |
Output is correct |
48 |
Correct |
7 ms |
11988 KB |
Output is correct |
49 |
Correct |
7 ms |
12084 KB |
Output is correct |
50 |
Correct |
7 ms |
12072 KB |
Output is correct |
51 |
Correct |
7 ms |
11988 KB |
Output is correct |
52 |
Correct |
7 ms |
12084 KB |
Output is correct |
53 |
Correct |
7 ms |
12116 KB |
Output is correct |
54 |
Correct |
8 ms |
12004 KB |
Output is correct |
55 |
Correct |
7 ms |
12092 KB |
Output is correct |
56 |
Correct |
8 ms |
12068 KB |
Output is correct |
57 |
Correct |
9 ms |
12076 KB |
Output is correct |
58 |
Correct |
8 ms |
12104 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
8 ms |
12068 KB |
Output is correct |
3 |
Correct |
6 ms |
11988 KB |
Output is correct |
4 |
Correct |
7 ms |
11988 KB |
Output is correct |
5 |
Correct |
7 ms |
12072 KB |
Output is correct |
6 |
Correct |
6 ms |
11988 KB |
Output is correct |
7 |
Correct |
8 ms |
12164 KB |
Output is correct |
8 |
Correct |
8 ms |
11988 KB |
Output is correct |
9 |
Correct |
7 ms |
11988 KB |
Output is correct |
10 |
Correct |
8 ms |
12068 KB |
Output is correct |
11 |
Correct |
6 ms |
12072 KB |
Output is correct |
12 |
Correct |
7 ms |
12072 KB |
Output is correct |
13 |
Correct |
8 ms |
11988 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
7 ms |
11988 KB |
Output is correct |
16 |
Correct |
7 ms |
11948 KB |
Output is correct |
17 |
Correct |
7 ms |
11988 KB |
Output is correct |
18 |
Correct |
8 ms |
12072 KB |
Output is correct |
19 |
Correct |
7 ms |
12068 KB |
Output is correct |
20 |
Correct |
7 ms |
11988 KB |
Output is correct |
21 |
Correct |
7 ms |
12068 KB |
Output is correct |
22 |
Correct |
7 ms |
12148 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
7 ms |
12116 KB |
Output is correct |
25 |
Correct |
7 ms |
12116 KB |
Output is correct |
26 |
Correct |
8 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12176 KB |
Output is correct |
28 |
Correct |
7 ms |
12084 KB |
Output is correct |
29 |
Correct |
7 ms |
12116 KB |
Output is correct |
30 |
Correct |
7 ms |
12076 KB |
Output is correct |
31 |
Correct |
7 ms |
12116 KB |
Output is correct |
32 |
Correct |
7 ms |
11988 KB |
Output is correct |
33 |
Correct |
7 ms |
11988 KB |
Output is correct |
34 |
Correct |
7 ms |
12068 KB |
Output is correct |
35 |
Correct |
7 ms |
11988 KB |
Output is correct |
36 |
Correct |
6 ms |
11988 KB |
Output is correct |
37 |
Correct |
7 ms |
12116 KB |
Output is correct |
38 |
Correct |
7 ms |
12116 KB |
Output is correct |
39 |
Correct |
7 ms |
12068 KB |
Output is correct |
40 |
Correct |
7 ms |
11988 KB |
Output is correct |
41 |
Correct |
7 ms |
12072 KB |
Output is correct |
42 |
Correct |
6 ms |
11988 KB |
Output is correct |
43 |
Correct |
6 ms |
12116 KB |
Output is correct |
44 |
Correct |
6 ms |
11988 KB |
Output is correct |
45 |
Correct |
7 ms |
11988 KB |
Output is correct |
46 |
Correct |
7 ms |
12076 KB |
Output is correct |
47 |
Correct |
6 ms |
11988 KB |
Output is correct |
48 |
Correct |
7 ms |
11988 KB |
Output is correct |
49 |
Correct |
7 ms |
12084 KB |
Output is correct |
50 |
Correct |
7 ms |
12072 KB |
Output is correct |
51 |
Correct |
7 ms |
11988 KB |
Output is correct |
52 |
Correct |
7 ms |
12084 KB |
Output is correct |
53 |
Correct |
7 ms |
12116 KB |
Output is correct |
54 |
Correct |
8 ms |
12004 KB |
Output is correct |
55 |
Correct |
7 ms |
12092 KB |
Output is correct |
56 |
Correct |
8 ms |
12068 KB |
Output is correct |
57 |
Correct |
9 ms |
12076 KB |
Output is correct |
58 |
Correct |
8 ms |
12104 KB |
Output is correct |
59 |
Correct |
352 ms |
37764 KB |
Output is correct |
60 |
Correct |
451 ms |
40932 KB |
Output is correct |
61 |
Correct |
7 ms |
11988 KB |
Output is correct |
62 |
Correct |
6 ms |
11988 KB |
Output is correct |
63 |
Correct |
258 ms |
35132 KB |
Output is correct |
64 |
Correct |
9 ms |
12628 KB |
Output is correct |
65 |
Correct |
16 ms |
14260 KB |
Output is correct |
66 |
Correct |
116 ms |
31308 KB |
Output is correct |
67 |
Correct |
454 ms |
53020 KB |
Output is correct |
68 |
Correct |
476 ms |
53932 KB |
Output is correct |
69 |
Correct |
14 ms |
13012 KB |
Output is correct |
70 |
Correct |
75 ms |
21872 KB |
Output is correct |
71 |
Correct |
286 ms |
43792 KB |
Output is correct |
72 |
Correct |
289 ms |
42700 KB |
Output is correct |
73 |
Correct |
72 ms |
19532 KB |
Output is correct |
74 |
Correct |
407 ms |
39580 KB |
Output is correct |
75 |
Correct |
29 ms |
15480 KB |
Output is correct |
76 |
Correct |
265 ms |
43528 KB |
Output is correct |
77 |
Correct |
284 ms |
43672 KB |
Output is correct |
78 |
Correct |
31 ms |
16032 KB |
Output is correct |
79 |
Correct |
401 ms |
50684 KB |
Output is correct |
80 |
Correct |
8 ms |
12212 KB |
Output is correct |
81 |
Correct |
87 ms |
21884 KB |
Output is correct |
82 |
Correct |
392 ms |
41496 KB |
Output is correct |
83 |
Correct |
412 ms |
39604 KB |
Output is correct |
84 |
Correct |
392 ms |
39560 KB |
Output is correct |
85 |
Correct |
419 ms |
39604 KB |
Output is correct |
86 |
Correct |
403 ms |
40680 KB |
Output is correct |
87 |
Correct |
418 ms |
40620 KB |
Output is correct |