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Submission #394614

# Submission time Handle Problem Language Result Execution time Memory
394614 2021-04-27T05:54:59 Z iANikzad Network (BOI15_net) C++14
100 / 100
 485 ms 45248 KB 
#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define F first
#define S second
#define debug(x) cerr<<#x<<" :"<<x<<"\n"
#define all(x) x.begin(),x.end()
//#define pii pair<int,int>
#define FAST ios_base::sync_with_stdio(false), cin.tie(), cout.tie();
//#define int long long

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;

const int maxn = 5e5 + 7;
const int mod = 1e9 + 7;
const int INF = 1e9 + 7;
const int mlog = 20;
const int SQ = 400;

int root;

vector<int> adj[maxn];
vector<int> Leaf;

void dfs(int v,int par = -1)
{
    if(adj[v].size() == 1) Leaf.pb(v);
    for(int u : adj[v]) if(u != par) dfs(u, v);
}

int main()
{
    FAST;

    int n;
    cin >> n;

    for(int i = 1; i < n; i++)
    {
        int u, v;
        cin >> u >> v;

        adj[u].pb(v); adj[v].pb(u);
    }

    root = 1;
    dfs(root);


    int SZ = (Leaf.size() + 1) >> 1;
    cout << SZ << "\n";

    for(int i = 0; i < SZ; i++)
        cout << Leaf[i] << " " << Leaf[(i + SZ) % Leaf.size()] << "\n";

    return 0;
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11980 KB Output is correct
2 Correct 8 ms 12040 KB Output is correct
3 Correct 8 ms 12028 KB Output is correct
4 Correct 8 ms 11984 KB Output is correct
5 Correct 8 ms 11940 KB Output is correct
6 Correct 8 ms 11980 KB Output is correct
7 Correct 8 ms 11980 KB Output is correct
8 Correct 8 ms 11944 KB Output is correct
9 Correct 9 ms 11980 KB Output is correct
10 Correct 8 ms 11980 KB Output is correct
11 Correct 8 ms 12056 KB Output is correct
12 Correct 8 ms 12056 KB Output is correct
13 Correct 8 ms 11980 KB Output is correct
14 Correct 8 ms 11980 KB Output is correct
15 Correct 8 ms 11984 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 8 ms 11980 KB Output is correct
18 Correct 8 ms 11980 KB Output is correct
19 Correct 8 ms 11980 KB Output is correct
20 Correct 8 ms 11980 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11980 KB Output is correct
2 Correct 8 ms 12040 KB Output is correct
3 Correct 8 ms 12028 KB Output is correct
4 Correct 8 ms 11984 KB Output is correct
5 Correct 8 ms 11940 KB Output is correct
6 Correct 8 ms 11980 KB Output is correct
7 Correct 8 ms 11980 KB Output is correct
8 Correct 8 ms 11944 KB Output is correct
9 Correct 9 ms 11980 KB Output is correct
10 Correct 8 ms 11980 KB Output is correct
11 Correct 8 ms 12056 KB Output is correct
12 Correct 8 ms 12056 KB Output is correct
13 Correct 8 ms 11980 KB Output is correct
14 Correct 8 ms 11980 KB Output is correct
15 Correct 8 ms 11984 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 8 ms 11980 KB Output is correct
18 Correct 8 ms 11980 KB Output is correct
19 Correct 8 ms 11980 KB Output is correct
20 Correct 8 ms 11980 KB Output is correct
21 Correct 8 ms 11980 KB Output is correct
22 Correct 9 ms 12108 KB Output is correct
23 Correct 9 ms 12108 KB Output is correct
24 Correct 9 ms 12108 KB Output is correct
25 Correct 9 ms 12108 KB Output is correct
26 Correct 9 ms 12112 KB Output is correct
27 Correct 9 ms 12108 KB Output is correct
28 Correct 9 ms 12108 KB Output is correct
29 Correct 9 ms 12108 KB Output is correct
30 Correct 8 ms 11980 KB Output is correct
31 Correct 10 ms 12108 KB Output is correct
32 Correct 8 ms 11980 KB Output is correct
33 Correct 8 ms 12012 KB Output is correct
34 Correct 8 ms 11980 KB Output is correct
35 Correct 8 ms 11980 KB Output is correct
36 Correct 9 ms 11980 KB Output is correct
37 Correct 8 ms 12096 KB Output is correct
38 Correct 9 ms 12108 KB Output is correct
39 Correct 8 ms 12004 KB Output is correct
40 Correct 8 ms 11980 KB Output is correct
41 Correct 8 ms 11980 KB Output is correct
42 Correct 8 ms 11980 KB Output is correct
43 Correct 8 ms 12108 KB Output is correct
44 Correct 8 ms 11980 KB Output is correct
45 Correct 8 ms 11980 KB Output is correct
46 Correct 8 ms 12076 KB Output is correct
47 Correct 8 ms 11980 KB Output is correct
48 Correct 8 ms 11980 KB Output is correct
49 Correct 8 ms 12060 KB Output is correct
50 Correct 8 ms 11980 KB Output is correct
51 Correct 8 ms 11980 KB Output is correct
52 Correct 8 ms 12080 KB Output is correct
53 Correct 8 ms 12108 KB Output is correct
54 Correct 9 ms 11984 KB Output is correct
55 Correct 8 ms 11992 KB Output is correct
56 Correct 8 ms 11980 KB Output is correct
57 Correct 9 ms 12068 KB Output is correct
58 Correct 9 ms 12164 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11980 KB Output is correct
2 Correct 8 ms 12040 KB Output is correct
3 Correct 8 ms 12028 KB Output is correct
4 Correct 8 ms 11984 KB Output is correct
5 Correct 8 ms 11940 KB Output is correct
6 Correct 8 ms 11980 KB Output is correct
7 Correct 8 ms 11980 KB Output is correct
8 Correct 8 ms 11944 KB Output is correct
9 Correct 9 ms 11980 KB Output is correct
10 Correct 8 ms 11980 KB Output is correct
11 Correct 8 ms 12056 KB Output is correct
12 Correct 8 ms 12056 KB Output is correct
13 Correct 8 ms 11980 KB Output is correct
14 Correct 8 ms 11980 KB Output is correct
15 Correct 8 ms 11984 KB Output is correct
16 Correct 8 ms 11980 KB Output is correct
17 Correct 8 ms 11980 KB Output is correct
18 Correct 8 ms 11980 KB Output is correct
19 Correct 8 ms 11980 KB Output is correct
20 Correct 8 ms 11980 KB Output is correct
21 Correct 8 ms 11980 KB Output is correct
22 Correct 9 ms 12108 KB Output is correct
23 Correct 9 ms 12108 KB Output is correct
24 Correct 9 ms 12108 KB Output is correct
25 Correct 9 ms 12108 KB Output is correct
26 Correct 9 ms 12112 KB Output is correct
27 Correct 9 ms 12108 KB Output is correct
28 Correct 9 ms 12108 KB Output is correct
29 Correct 9 ms 12108 KB Output is correct
30 Correct 8 ms 11980 KB Output is correct
31 Correct 10 ms 12108 KB Output is correct
32 Correct 8 ms 11980 KB Output is correct
33 Correct 8 ms 12012 KB Output is correct
34 Correct 8 ms 11980 KB Output is correct
35 Correct 8 ms 11980 KB Output is correct
36 Correct 9 ms 11980 KB Output is correct
37 Correct 8 ms 12096 KB Output is correct
38 Correct 9 ms 12108 KB Output is correct
39 Correct 8 ms 12004 KB Output is correct
40 Correct 8 ms 11980 KB Output is correct
41 Correct 8 ms 11980 KB Output is correct
42 Correct 8 ms 11980 KB Output is correct
43 Correct 8 ms 12108 KB Output is correct
44 Correct 8 ms 11980 KB Output is correct
45 Correct 8 ms 11980 KB Output is correct
46 Correct 8 ms 12076 KB Output is correct
47 Correct 8 ms 11980 KB Output is correct
48 Correct 8 ms 11980 KB Output is correct
49 Correct 8 ms 12060 KB Output is correct
50 Correct 8 ms 11980 KB Output is correct
51 Correct 8 ms 11980 KB Output is correct
52 Correct 8 ms 12080 KB Output is correct
53 Correct 8 ms 12108 KB Output is correct
54 Correct 9 ms 11984 KB Output is correct
55 Correct 8 ms 11992 KB Output is correct
56 Correct 8 ms 11980 KB Output is correct
57 Correct 9 ms 12068 KB Output is correct
58 Correct 9 ms 12164 KB Output is correct
59 Correct 370 ms 29996 KB Output is correct
60 Correct 448 ms 32056 KB Output is correct
61 Correct 8 ms 11980 KB Output is correct
62 Correct 9 ms 12056 KB Output is correct
63 Correct 325 ms 28272 KB Output is correct
64 Correct 10 ms 12492 KB Output is correct
65 Correct 19 ms 13952 KB Output is correct
66 Correct 141 ms 28248 KB Output is correct
67 Correct 480 ms 44484 KB Output is correct
68 Correct 478 ms 45248 KB Output is correct
69 Correct 15 ms 12748 KB Output is correct
70 Correct 89 ms 19156 KB Output is correct
71 Correct 311 ms 35212 KB Output is correct
72 Correct 333 ms 34352 KB Output is correct
73 Correct 90 ms 17480 KB Output is correct
74 Correct 452 ms 31028 KB Output is correct
75 Correct 32 ms 14652 KB Output is correct
76 Correct 329 ms 34864 KB Output is correct
77 Correct 328 ms 35104 KB Output is correct
78 Correct 34 ms 14996 KB Output is correct
79 Correct 485 ms 42148 KB Output is correct
80 Correct 9 ms 12236 KB Output is correct
81 Correct 107 ms 19228 KB Output is correct
82 Correct 390 ms 33128 KB Output is correct
83 Correct 448 ms 31024 KB Output is correct
84 Correct 466 ms 30964 KB Output is correct
85 Correct 436 ms 31028 KB Output is correct
86 Correct 454 ms 32044 KB Output is correct
87 Correct 435 ms 32132 KB Output is correct