oj.uz

Submission #543435

# Submission time Handle Problem Language Result Execution time Memory
543435 2022-03-30T15:05:29 Z Olympia Network (BOI15_net) C++17
100 / 100
 405 ms 40980 KB 
#include <vector>
#include <algorithm>
#include <iostream>
#include <set>
#include <cmath>
#include <map>
#include <random>
#include <cassert>
#include <ctime>
#include <cstdlib>
#include <queue>
#include <limits.h>

using namespace std;
vector<vector<int>> adj;
vector<int> nodes;
int root;
void dfs (int curNode, int prevNode) {
    if (adj[curNode].size() == 1) nodes.push_back(curNode);
    for (int i: adj[curNode]) {
        if (i != prevNode) {
            dfs (i, curNode);
        }
    }
}
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    adj.resize(n);
    for (int i = 0; i < n - 1; i++) {
        int u, v; cin >> u >> v; u--, v--;
        adj[u].push_back(v), adj[v].push_back(u);
    }
    for (int i = 0; i < n; i++) {
        if (adj[i].size() != 1) {
            root = i;
        }
    }
    dfs (0, 0);
    cout << (nodes.size() + 1)/2 << '\n';
    for (int i = 0; i < (nodes.size() + 1)/2; i++) {
        cout << nodes[i] + 1 << " " << nodes[i + nodes.size()/2] + 1 << '\n';
    }


}

Compilation message

net.cpp: In function 'int main()':
net.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i = 0; i < (nodes.size() + 1)/2; i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 368 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 0 ms 212 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 0 ms 212 KB Output is correct
36 Correct 0 ms 212 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 0 ms 212 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 0 ms 212 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 368 KB Output is correct
47 Correct 0 ms 212 KB Output is correct
48 Correct 0 ms 340 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 1 ms 212 KB Output is correct
51 Correct 0 ms 212 KB Output is correct
52 Correct 0 ms 340 KB Output is correct
53 Correct 1 ms 340 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 1 ms 340 KB Output is correct
56 Correct 0 ms 212 KB Output is correct
57 Correct 1 ms 340 KB Output is correct
58 Correct 1 ms 468 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 368 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 0 ms 212 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 0 ms 212 KB Output is correct
36 Correct 0 ms 212 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 0 ms 212 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 0 ms 212 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 368 KB Output is correct
47 Correct 0 ms 212 KB Output is correct
48 Correct 0 ms 340 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 1 ms 212 KB Output is correct
51 Correct 0 ms 212 KB Output is correct
52 Correct 0 ms 340 KB Output is correct
53 Correct 1 ms 340 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 1 ms 340 KB Output is correct
56 Correct 0 ms 212 KB Output is correct
57 Correct 1 ms 340 KB Output is correct
58 Correct 1 ms 468 KB Output is correct
59 Correct 287 ms 28860 KB Output is correct
60 Correct 356 ms 32040 KB Output is correct
61 Correct 0 ms 212 KB Output is correct
62 Correct 0 ms 212 KB Output is correct
63 Correct 252 ms 25860 KB Output is correct
64 Correct 2 ms 724 KB Output is correct
65 Correct 10 ms 2420 KB Output is correct
66 Correct 107 ms 18060 KB Output is correct
67 Correct 404 ms 40268 KB Output is correct
68 Correct 405 ms 40980 KB Output is correct
69 Correct 5 ms 1364 KB Output is correct
70 Correct 64 ms 11184 KB Output is correct
71 Correct 245 ms 35160 KB Output is correct
72 Correct 258 ms 34384 KB Output is correct
73 Correct 67 ms 8852 KB Output is correct
74 Correct 363 ms 31008 KB Output is correct
75 Correct 18 ms 4180 KB Output is correct
76 Correct 256 ms 34848 KB Output is correct
77 Correct 247 ms 35164 KB Output is correct
78 Correct 19 ms 4308 KB Output is correct
79 Correct 399 ms 38464 KB Output is correct
80 Correct 2 ms 596 KB Output is correct
81 Correct 77 ms 11412 KB Output is correct
82 Correct 313 ms 33080 KB Output is correct
83 Correct 358 ms 31096 KB Output is correct
84 Correct 371 ms 31040 KB Output is correct
85 Correct 353 ms 31040 KB Output is correct
86 Correct 351 ms 32108 KB Output is correct
87 Correct 354 ms 32220 KB Output is correct