oj.uz

Submission #546669

# Submission time Handle Problem Language Result Execution time Memory
546669 2022-04-08T02:48:55 Z Jomnoi Network (BOI15_net) C++17
100 / 100
 401 ms 47676 KB 
#include <bits/stdc++.h>
#define DEBUG 0
using namespace std;

const int N = 5e5 + 10;

vector <int> adj[N];
vector <int> leaf;

void dfs(int u, int p) {
    if(adj[u].size() == 1) {
        leaf.push_back(u);
    }
    for(auto v : adj[u]) {
        if(v != p) {
            dfs(v, u);
        }
    }
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n;
    cin >> n;
    for(int i = 1; i <= n - 1; i++) {
        int a, b;
        cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }

    for(int i = 1; i <= n; i++) {
        if(adj[i].size() > 1) {
            dfs(1, -1);
            break;
        }
    }

    cout << (leaf.size() + 1) / 2 << '\n';
    for(int i = 0; i < (leaf.size() + 1) / 2; i++) {
        cout << leaf[i] << ' ' << leaf[leaf.size() / 2 + i] << '\n';
    }
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:40:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for(int i = 0; i < (leaf.size() + 1) / 2; i++) {
      |                    ~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# 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 6 ms 11988 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 8 ms 12040 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11940 KB Output is correct
10 Correct 7 ms 11988 KB Output is correct
11 Correct 6 ms 12064 KB Output is correct
12 Correct 6 ms 12060 KB Output is correct
13 Correct 6 ms 12032 KB Output is correct
14 Correct 7 ms 12056 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 12064 KB Output is correct
17 Correct 6 ms 12064 KB Output is correct
18 Correct 6 ms 12060 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 6 ms 12064 KB Output is correct

Subtask #2
45.0 / 45.0

# 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 6 ms 11988 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 8 ms 12040 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11940 KB Output is correct
10 Correct 7 ms 11988 KB Output is correct
11 Correct 6 ms 12064 KB Output is correct
12 Correct 6 ms 12060 KB Output is correct
13 Correct 6 ms 12032 KB Output is correct
14 Correct 7 ms 12056 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 12064 KB Output is correct
17 Correct 6 ms 12064 KB Output is correct
18 Correct 6 ms 12060 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 6 ms 12064 KB Output is correct
21 Correct 7 ms 12060 KB Output is correct
22 Correct 7 ms 12116 KB Output is correct
23 Correct 7 ms 12116 KB Output is correct
24 Correct 7 ms 12068 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 7 ms 12068 KB Output is correct
27 Correct 8 ms 12056 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 7 ms 12116 KB Output is correct
30 Correct 6 ms 11988 KB Output is correct
31 Correct 9 ms 12076 KB Output is correct
32 Correct 8 ms 12056 KB Output is correct
33 Correct 7 ms 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 7 ms 12060 KB Output is correct
36 Correct 6 ms 11988 KB Output is correct
37 Correct 7 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 11988 KB Output is correct
41 Correct 6 ms 12060 KB Output is correct
42 Correct 6 ms 12060 KB Output is correct
43 Correct 7 ms 12116 KB Output is correct
44 Correct 6 ms 11988 KB Output is correct
45 Correct 8 ms 12032 KB Output is correct
46 Correct 7 ms 11988 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 12116 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 6 ms 12060 KB Output is correct
52 Correct 7 ms 11988 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 10 ms 12068 KB Output is correct
57 Correct 7 ms 12032 KB Output is correct
58 Correct 8 ms 12088 KB Output is correct

Subtask #3
37.0 / 37.0

# 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 6 ms 11988 KB Output is correct
5 Correct 6 ms 11988 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 8 ms 12040 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 11940 KB Output is correct
10 Correct 7 ms 11988 KB Output is correct
11 Correct 6 ms 12064 KB Output is correct
12 Correct 6 ms 12060 KB Output is correct
13 Correct 6 ms 12032 KB Output is correct
14 Correct 7 ms 12056 KB Output is correct
15 Correct 6 ms 11988 KB Output is correct
16 Correct 7 ms 12064 KB Output is correct
17 Correct 6 ms 12064 KB Output is correct
18 Correct 6 ms 12060 KB Output is correct
19 Correct 6 ms 11988 KB Output is correct
20 Correct 6 ms 12064 KB Output is correct
21 Correct 7 ms 12060 KB Output is correct
22 Correct 7 ms 12116 KB Output is correct
23 Correct 7 ms 12116 KB Output is correct
24 Correct 7 ms 12068 KB Output is correct
25 Correct 8 ms 12116 KB Output is correct
26 Correct 7 ms 12068 KB Output is correct
27 Correct 8 ms 12056 KB Output is correct
28 Correct 7 ms 12116 KB Output is correct
29 Correct 7 ms 12116 KB Output is correct
30 Correct 6 ms 11988 KB Output is correct
31 Correct 9 ms 12076 KB Output is correct
32 Correct 8 ms 12056 KB Output is correct
33 Correct 7 ms 11988 KB Output is correct
34 Correct 6 ms 11988 KB Output is correct
35 Correct 7 ms 12060 KB Output is correct
36 Correct 6 ms 11988 KB Output is correct
37 Correct 7 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 11988 KB Output is correct
41 Correct 6 ms 12060 KB Output is correct
42 Correct 6 ms 12060 KB Output is correct
43 Correct 7 ms 12116 KB Output is correct
44 Correct 6 ms 11988 KB Output is correct
45 Correct 8 ms 12032 KB Output is correct
46 Correct 7 ms 11988 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 12116 KB Output is correct
50 Correct 7 ms 11988 KB Output is correct
51 Correct 6 ms 12060 KB Output is correct
52 Correct 7 ms 11988 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 10 ms 12068 KB Output is correct
57 Correct 7 ms 12032 KB Output is correct
58 Correct 8 ms 12088 KB Output is correct
59 Correct 283 ms 36180 KB Output is correct
60 Correct 353 ms 38704 KB Output is correct
61 Correct 6 ms 11988 KB Output is correct
62 Correct 7 ms 11988 KB Output is correct
63 Correct 254 ms 33608 KB Output is correct
64 Correct 8 ms 12372 KB Output is correct
65 Correct 15 ms 13824 KB Output is correct
66 Correct 103 ms 27904 KB Output is correct
67 Correct 393 ms 46808 KB Output is correct
68 Correct 401 ms 47676 KB Output is correct
69 Correct 11 ms 12884 KB Output is correct
70 Correct 69 ms 21284 KB Output is correct
71 Correct 255 ms 41788 KB Output is correct
72 Correct 258 ms 40696 KB Output is correct
73 Correct 75 ms 19108 KB Output is correct
74 Correct 356 ms 37752 KB Output is correct
75 Correct 25 ms 15260 KB Output is correct
76 Correct 247 ms 41528 KB Output is correct
77 Correct 244 ms 41636 KB Output is correct
78 Correct 31 ms 15300 KB Output is correct
79 Correct 393 ms 45104 KB Output is correct
80 Correct 8 ms 12244 KB Output is correct
81 Correct 88 ms 21272 KB Output is correct
82 Correct 300 ms 39472 KB Output is correct
83 Correct 358 ms 37572 KB Output is correct
84 Correct 353 ms 37756 KB Output is correct
85 Correct 348 ms 37756 KB Output is correct
86 Correct 344 ms 38852 KB Output is correct
87 Correct 346 ms 38736 KB Output is correct