Submission #917650

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
917650	2024-01-28T14:01:21 Z	VMaksimoski008	Network (BOI15_net)	C++17	100 / 100	457 ms	47820 KB

#include <bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

int n;
vector<vector<int> > graph;
vector<int> leaves;

void dfs(int u, int p) {
    for(int &v : graph[u]) {
        if(v == p) continue;
        dfs(v, u);
    }

    if(graph[u].size() == 1) leaves.push_back(u);
}

int32_t main() {
    setIO();

    cin >> n;
    graph.resize(n+1);

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

    dfs(1, 0);

    cout << (sz(leaves) + 1) / 2 << '\n';
    for(int i=0; i<sz(leaves)/2; i++)
        cout << leaves[i] << " " << leaves[i+sz(leaves)/2] << '\n';
    if(sz(leaves) % 2 == 1) cout << leaves[0] << " " << leaves.back() << '\n';
    return 0;
}

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	1 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	600 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	344 KB	Output is correct
15	Correct	0 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	1 ms	348 KB	Output is correct
18	Correct	0 ms	348 KB	Output is correct
19	Correct	0 ms	348 KB	Output is correct
20	Correct	1 ms	348 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	1 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	600 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	344 KB	Output is correct
15	Correct	0 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	1 ms	348 KB	Output is correct
18	Correct	0 ms	348 KB	Output is correct
19	Correct	0 ms	348 KB	Output is correct
20	Correct	1 ms	348 KB	Output is correct
21	Correct	1 ms	348 KB	Output is correct
22	Correct	1 ms	600 KB	Output is correct
23	Correct	1 ms	600 KB	Output is correct
24	Correct	1 ms	604 KB	Output is correct
25	Correct	1 ms	600 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	604 KB	Output is correct
28	Correct	1 ms	604 KB	Output is correct
29	Correct	1 ms	348 KB	Output is correct
30	Correct	1 ms	344 KB	Output is correct
31	Correct	1 ms	600 KB	Output is correct
32	Correct	0 ms	348 KB	Output is correct
33	Correct	1 ms	348 KB	Output is correct
34	Correct	1 ms	344 KB	Output is correct
35	Correct	1 ms	348 KB	Output is correct
36	Correct	0 ms	348 KB	Output is correct
37	Correct	0 ms	348 KB	Output is correct
38	Correct	1 ms	348 KB	Output is correct
39	Correct	0 ms	348 KB	Output is correct
40	Correct	1 ms	348 KB	Output is correct
41	Correct	0 ms	348 KB	Output is correct
42	Correct	0 ms	348 KB	Output is correct
43	Correct	1 ms	344 KB	Output is correct
44	Correct	0 ms	600 KB	Output is correct
45	Correct	0 ms	348 KB	Output is correct
46	Correct	1 ms	344 KB	Output is correct
47	Correct	1 ms	348 KB	Output is correct
48	Correct	0 ms	344 KB	Output is correct
49	Correct	1 ms	348 KB	Output is correct
50	Correct	1 ms	344 KB	Output is correct
51	Correct	0 ms	348 KB	Output is correct
52	Correct	0 ms	348 KB	Output is correct
53	Correct	1 ms	348 KB	Output is correct
54	Correct	0 ms	348 KB	Output is correct
55	Correct	1 ms	348 KB	Output is correct
56	Correct	0 ms	348 KB	Output is correct
57	Correct	0 ms	348 KB	Output is correct
58	Correct	1 ms	604 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	1 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	600 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	344 KB	Output is correct
15	Correct	0 ms	348 KB	Output is correct
16	Correct	0 ms	348 KB	Output is correct
17	Correct	1 ms	348 KB	Output is correct
18	Correct	0 ms	348 KB	Output is correct
19	Correct	0 ms	348 KB	Output is correct
20	Correct	1 ms	348 KB	Output is correct
21	Correct	1 ms	348 KB	Output is correct
22	Correct	1 ms	600 KB	Output is correct
23	Correct	1 ms	600 KB	Output is correct
24	Correct	1 ms	604 KB	Output is correct
25	Correct	1 ms	600 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	604 KB	Output is correct
28	Correct	1 ms	604 KB	Output is correct
29	Correct	1 ms	348 KB	Output is correct
30	Correct	1 ms	344 KB	Output is correct
31	Correct	1 ms	600 KB	Output is correct
32	Correct	0 ms	348 KB	Output is correct
33	Correct	1 ms	348 KB	Output is correct
34	Correct	1 ms	344 KB	Output is correct
35	Correct	1 ms	348 KB	Output is correct
36	Correct	0 ms	348 KB	Output is correct
37	Correct	0 ms	348 KB	Output is correct
38	Correct	1 ms	348 KB	Output is correct
39	Correct	0 ms	348 KB	Output is correct
40	Correct	1 ms	348 KB	Output is correct
41	Correct	0 ms	348 KB	Output is correct
42	Correct	0 ms	348 KB	Output is correct
43	Correct	1 ms	344 KB	Output is correct
44	Correct	0 ms	600 KB	Output is correct
45	Correct	0 ms	348 KB	Output is correct
46	Correct	1 ms	344 KB	Output is correct
47	Correct	1 ms	348 KB	Output is correct
48	Correct	0 ms	344 KB	Output is correct
49	Correct	1 ms	348 KB	Output is correct
50	Correct	1 ms	344 KB	Output is correct
51	Correct	0 ms	348 KB	Output is correct
52	Correct	0 ms	348 KB	Output is correct
53	Correct	1 ms	348 KB	Output is correct
54	Correct	0 ms	348 KB	Output is correct
55	Correct	1 ms	348 KB	Output is correct
56	Correct	0 ms	348 KB	Output is correct
57	Correct	0 ms	348 KB	Output is correct
58	Correct	1 ms	604 KB	Output is correct
59	Correct	313 ms	34972 KB	Output is correct
60	Correct	335 ms	38892 KB	Output is correct
61	Correct	0 ms	348 KB	Output is correct
62	Correct	1 ms	348 KB	Output is correct
63	Correct	252 ms	31324 KB	Output is correct
64	Correct	2 ms	856 KB	Output is correct
65	Correct	8 ms	2768 KB	Output is correct
66	Correct	77 ms	20304 KB	Output is correct
67	Correct	437 ms	47028 KB	Output is correct
68	Correct	418 ms	47820 KB	Output is correct
69	Correct	4 ms	1624 KB	Output is correct
70	Correct	61 ms	13436 KB	Output is correct
71	Correct	197 ms	42048 KB	Output is correct
72	Correct	220 ms	41108 KB	Output is correct
73	Correct	44 ms	10708 KB	Output is correct
74	Correct	355 ms	37832 KB	Output is correct
75	Correct	14 ms	4828 KB	Output is correct
76	Correct	208 ms	41648 KB	Output is correct
77	Correct	210 ms	41672 KB	Output is correct
78	Correct	16 ms	4956 KB	Output is correct
79	Correct	457 ms	45184 KB	Output is correct
80	Correct	2 ms	604 KB	Output is correct
81	Correct	55 ms	13664 KB	Output is correct
82	Correct	326 ms	39536 KB	Output is correct
83	Correct	368 ms	37648 KB	Output is correct
84	Correct	359 ms	37788 KB	Output is correct
85	Correct	368 ms	37832 KB	Output is correct
86	Correct	344 ms	38760 KB	Output is correct
87	Correct	358 ms	38908 KB	Output is correct

Submission #917650

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0