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Submission #404654

# Submission time Handle Problem Language Result Execution time Memory
404654 2021-05-14T19:24:48 Z Aryan_Raina Network (BOI15_net) C++14
100 / 100
 504 ms 57184 KB 
#include <bits/stdc++.h>
using namespace std; 

#define int int64_t
#define ld long double
#define ar array

const int INF = 1e17;
const int MOD = 1e9+7;

int32_t main() {
   ios_base::sync_with_stdio(0);
   cin.tie(0); cout.tie(0);

   int N; cin >> N;
   vector<int> g[N];
   for (int i = 0; i < N - 1; i++) {
      int a, b; cin >> a >> b; --a, --b;
      g[a].push_back(b); g[b].push_back(a);
   }

   vector<int> leaves;
   function<void(int,int)> dfs = [&](int u, int pu) {
      if (g[u].size() == 1) leaves.push_back(u);
      for (int v : g[u]) if (v != pu) dfs(v, u);
   };

   // leaves are now sorted in tout order
   dfs(0, 0);

   int dif = (leaves.size() + 1) / 2;
   cout << dif << '\n';

   for (int i = 0; i < leaves.size()/2; i++)
      cout << leaves[i] + 1 << ' ' << leaves[i + dif] + 1 << '\n';

   if (leaves.size() & 1) 
      cout << leaves[leaves.size()/2] + 1 << ' ' << leaves[0] + 1<< '\n';
}

Compilation message

net.cpp: In function 'int32_t main()':
net.cpp:34:22: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |    for (int i = 0; i < leaves.size()/2; i++)
      |                    ~~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 312 KB Output is correct
22 Correct 2 ms 460 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 440 KB Output is correct
25 Correct 2 ms 460 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 2 ms 460 KB Output is correct
28 Correct 2 ms 440 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 1 ms 204 KB Output is correct
31 Correct 2 ms 472 KB Output is correct
32 Correct 1 ms 204 KB Output is correct
33 Correct 1 ms 312 KB Output is correct
34 Correct 1 ms 204 KB Output is correct
35 Correct 1 ms 308 KB Output is correct
36 Correct 1 ms 204 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 2 ms 332 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 308 KB Output is correct
41 Correct 1 ms 204 KB Output is correct
42 Correct 1 ms 332 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 312 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 204 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 1 ms 332 KB Output is correct
50 Correct 1 ms 204 KB Output is correct
51 Correct 1 ms 312 KB Output is correct
52 Correct 1 ms 308 KB Output is correct
53 Correct 2 ms 332 KB Output is correct
54 Correct 1 ms 204 KB Output is correct
55 Correct 1 ms 312 KB Output is correct
56 Correct 1 ms 204 KB Output is correct
57 Correct 1 ms 332 KB Output is correct
58 Correct 2 ms 460 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 312 KB Output is correct
22 Correct 2 ms 460 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 440 KB Output is correct
25 Correct 2 ms 460 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 2 ms 460 KB Output is correct
28 Correct 2 ms 440 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 1 ms 204 KB Output is correct
31 Correct 2 ms 472 KB Output is correct
32 Correct 1 ms 204 KB Output is correct
33 Correct 1 ms 312 KB Output is correct
34 Correct 1 ms 204 KB Output is correct
35 Correct 1 ms 308 KB Output is correct
36 Correct 1 ms 204 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 2 ms 332 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 308 KB Output is correct
41 Correct 1 ms 204 KB Output is correct
42 Correct 1 ms 332 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 312 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 204 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 1 ms 332 KB Output is correct
50 Correct 1 ms 204 KB Output is correct
51 Correct 1 ms 312 KB Output is correct
52 Correct 1 ms 308 KB Output is correct
53 Correct 2 ms 332 KB Output is correct
54 Correct 1 ms 204 KB Output is correct
55 Correct 1 ms 312 KB Output is correct
56 Correct 1 ms 204 KB Output is correct
57 Correct 1 ms 332 KB Output is correct
58 Correct 2 ms 460 KB Output is correct
59 Correct 368 ms 39476 KB Output is correct
60 Correct 476 ms 43572 KB Output is correct
61 Correct 1 ms 204 KB Output is correct
62 Correct 1 ms 204 KB Output is correct
63 Correct 335 ms 34396 KB Output is correct
64 Correct 3 ms 972 KB Output is correct
65 Correct 13 ms 3244 KB Output is correct
66 Correct 130 ms 25584 KB Output is correct
67 Correct 460 ms 55236 KB Output is correct
68 Correct 504 ms 57184 KB Output is correct
69 Correct 7 ms 1612 KB Output is correct
70 Correct 84 ms 15276 KB Output is correct
71 Correct 321 ms 45804 KB Output is correct
72 Correct 336 ms 44252 KB Output is correct
73 Correct 86 ms 11580 KB Output is correct
74 Correct 444 ms 41088 KB Output is correct
75 Correct 25 ms 5180 KB Output is correct
76 Correct 329 ms 45416 KB Output is correct
77 Correct 317 ms 45488 KB Output is correct
78 Correct 27 ms 5676 KB Output is correct
79 Correct 464 ms 52280 KB Output is correct
80 Correct 3 ms 580 KB Output is correct
81 Correct 103 ms 14716 KB Output is correct
82 Correct 387 ms 43248 KB Output is correct
83 Correct 449 ms 41104 KB Output is correct
84 Correct 441 ms 41112 KB Output is correct
85 Correct 443 ms 41064 KB Output is correct
86 Correct 440 ms 43380 KB Output is correct
87 Correct 463 ms 43380 KB Output is correct