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Submission #414413

# Submission time Handle Problem Language Result Execution time Memory
414413 2021-05-30T12:08:42 Z bigDuck Network (BOI15_net) C++14
100 / 100
 495 ms 49004 KB 
#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
#define int ll

int t, n, m, k, a[300010], q, l, r;

vector<int> g[500010];
vector<int> leaves;

bool v[500010];
void dfs(int s){
    v[s]=true;
    if(g[s].size()==1){
        leaves.pb(s);
    }
    for(auto u:g[s]){
        if(!v[u]){
            dfs(u);
        }
    }

}


int32_t main(){
INIT
cin>>n;
for(int i=1; i<n; i++){
    int a, b;
    cin>>a>>b;
    g[a].pb(b); g[b].pb(a);
}
dfs(1);
int sz=((int)leaves.size()+1)>>1ll, add=((int) leaves.size())>>1ll ;
cout<<sz<<"\n";
for(int i=0; i<sz; i++){
    cout<<leaves[i]<<" "<<leaves[i+add]<<"\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 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 8 ms 12028 KB Output is correct
5 Correct 8 ms 12064 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12068 KB Output is correct
8 Correct 8 ms 11980 KB Output is correct
9 Correct 8 ms 11980 KB Output is correct
10 Correct 8 ms 12016 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 8 ms 11980 KB Output is correct
13 Correct 7 ms 11980 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 12072 KB Output is correct
16 Correct 7 ms 12068 KB Output is correct
17 Correct 7 ms 11980 KB Output is correct
18 Correct 8 ms 12060 KB Output is correct
19 Correct 8 ms 12020 KB Output is correct
20 Correct 8 ms 12072 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 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 8 ms 12028 KB Output is correct
5 Correct 8 ms 12064 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12068 KB Output is correct
8 Correct 8 ms 11980 KB Output is correct
9 Correct 8 ms 11980 KB Output is correct
10 Correct 8 ms 12016 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 8 ms 11980 KB Output is correct
13 Correct 7 ms 11980 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 12072 KB Output is correct
16 Correct 7 ms 12068 KB Output is correct
17 Correct 7 ms 11980 KB Output is correct
18 Correct 8 ms 12060 KB Output is correct
19 Correct 8 ms 12020 KB Output is correct
20 Correct 8 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 9 ms 12108 KB Output is correct
23 Correct 8 ms 12108 KB Output is correct
24 Correct 10 ms 12108 KB Output is correct
25 Correct 9 ms 12084 KB Output is correct
26 Correct 9 ms 12076 KB Output is correct
27 Correct 9 ms 12108 KB Output is correct
28 Correct 8 ms 12108 KB Output is correct
29 Correct 8 ms 12108 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 9 ms 12108 KB Output is correct
32 Correct 8 ms 11980 KB Output is correct
33 Correct 8 ms 11980 KB Output is correct
34 Correct 8 ms 11980 KB Output is correct
35 Correct 8 ms 11980 KB Output is correct
36 Correct 8 ms 11980 KB Output is correct
37 Correct 8 ms 12084 KB Output is correct
38 Correct 8 ms 12108 KB Output is correct
39 Correct 8 ms 11980 KB Output is correct
40 Correct 8 ms 11980 KB Output is correct
41 Correct 8 ms 12064 KB Output is correct
42 Correct 8 ms 12068 KB Output is correct
43 Correct 8 ms 12108 KB Output is correct
44 Correct 9 ms 11980 KB Output is correct
45 Correct 9 ms 12064 KB Output is correct
46 Correct 8 ms 12072 KB Output is correct
47 Correct 9 ms 11980 KB Output is correct
48 Correct 8 ms 11980 KB Output is correct
49 Correct 8 ms 12108 KB Output is correct
50 Correct 8 ms 12024 KB Output is correct
51 Correct 8 ms 11980 KB Output is correct
52 Correct 8 ms 11980 KB Output is correct
53 Correct 8 ms 12072 KB Output is correct
54 Correct 9 ms 11980 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 14 ms 12060 KB Output is correct
57 Correct 10 ms 12108 KB Output is correct
58 Correct 8 ms 12108 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 11980 KB Output is correct
3 Correct 7 ms 11980 KB Output is correct
4 Correct 8 ms 12028 KB Output is correct
5 Correct 8 ms 12064 KB Output is correct
6 Correct 7 ms 11980 KB Output is correct
7 Correct 7 ms 12068 KB Output is correct
8 Correct 8 ms 11980 KB Output is correct
9 Correct 8 ms 11980 KB Output is correct
10 Correct 8 ms 12016 KB Output is correct
11 Correct 8 ms 11980 KB Output is correct
12 Correct 8 ms 11980 KB Output is correct
13 Correct 7 ms 11980 KB Output is correct
14 Correct 7 ms 11980 KB Output is correct
15 Correct 7 ms 12072 KB Output is correct
16 Correct 7 ms 12068 KB Output is correct
17 Correct 7 ms 11980 KB Output is correct
18 Correct 8 ms 12060 KB Output is correct
19 Correct 8 ms 12020 KB Output is correct
20 Correct 8 ms 12072 KB Output is correct
21 Correct 7 ms 11980 KB Output is correct
22 Correct 9 ms 12108 KB Output is correct
23 Correct 8 ms 12108 KB Output is correct
24 Correct 10 ms 12108 KB Output is correct
25 Correct 9 ms 12084 KB Output is correct
26 Correct 9 ms 12076 KB Output is correct
27 Correct 9 ms 12108 KB Output is correct
28 Correct 8 ms 12108 KB Output is correct
29 Correct 8 ms 12108 KB Output is correct
30 Correct 7 ms 11980 KB Output is correct
31 Correct 9 ms 12108 KB Output is correct
32 Correct 8 ms 11980 KB Output is correct
33 Correct 8 ms 11980 KB Output is correct
34 Correct 8 ms 11980 KB Output is correct
35 Correct 8 ms 11980 KB Output is correct
36 Correct 8 ms 11980 KB Output is correct
37 Correct 8 ms 12084 KB Output is correct
38 Correct 8 ms 12108 KB Output is correct
39 Correct 8 ms 11980 KB Output is correct
40 Correct 8 ms 11980 KB Output is correct
41 Correct 8 ms 12064 KB Output is correct
42 Correct 8 ms 12068 KB Output is correct
43 Correct 8 ms 12108 KB Output is correct
44 Correct 9 ms 11980 KB Output is correct
45 Correct 9 ms 12064 KB Output is correct
46 Correct 8 ms 12072 KB Output is correct
47 Correct 9 ms 11980 KB Output is correct
48 Correct 8 ms 11980 KB Output is correct
49 Correct 8 ms 12108 KB Output is correct
50 Correct 8 ms 12024 KB Output is correct
51 Correct 8 ms 11980 KB Output is correct
52 Correct 8 ms 11980 KB Output is correct
53 Correct 8 ms 12072 KB Output is correct
54 Correct 9 ms 11980 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 14 ms 12060 KB Output is correct
57 Correct 10 ms 12108 KB Output is correct
58 Correct 8 ms 12108 KB Output is correct
59 Correct 364 ms 40884 KB Output is correct
60 Correct 437 ms 43836 KB Output is correct
61 Correct 8 ms 11980 KB Output is correct
62 Correct 9 ms 12068 KB Output is correct
63 Correct 319 ms 37028 KB Output is correct
64 Correct 10 ms 12416 KB Output is correct
65 Correct 18 ms 13900 KB Output is correct
66 Correct 133 ms 28124 KB Output is correct
67 Correct 483 ms 47548 KB Output is correct
68 Correct 495 ms 49004 KB Output is correct
69 Correct 14 ms 13092 KB Output is correct
70 Correct 93 ms 23436 KB Output is correct
71 Correct 301 ms 46284 KB Output is correct
72 Correct 321 ms 44656 KB Output is correct
73 Correct 111 ms 20208 KB Output is correct
74 Correct 439 ms 41644 KB Output is correct
75 Correct 36 ms 15740 KB Output is correct
76 Correct 318 ms 45764 KB Output is correct
77 Correct 317 ms 45972 KB Output is correct
78 Correct 38 ms 15680 KB Output is correct
79 Correct 480 ms 45640 KB Output is correct
80 Correct 10 ms 12236 KB Output is correct
81 Correct 106 ms 22716 KB Output is correct
82 Correct 376 ms 43668 KB Output is correct
83 Correct 441 ms 41648 KB Output is correct
84 Correct 452 ms 41592 KB Output is correct
85 Correct 447 ms 41740 KB Output is correct
86 Correct 466 ms 43888 KB Output is correct
87 Correct 461 ms 43824 KB Output is correct