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Submission #226273

# Submission time Handle Problem Language Result Execution time Memory
226273 2020-04-23T09:13:45 Z MKopchev Network (BOI15_net) C++14
100 / 100
 519 ms 45300 KB 
#include<bits/stdc++.h>
using namespace std;
const int nmax=5e5+42;

int n;
vector<int> adj[nmax];

vector<int> leaves;

void dfs(int node,int par)
{
    if(adj[node].size()==1)leaves.push_back(node);

    for(auto k:adj[node])
        if(k!=par)dfs(k,node);
}
int main()
{
    scanf("%i",&n);

    int u,v;
    for(int i=1;i<n;i++)
    {
        scanf("%i%i",&u,&v);
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    for(int i=1;i<=n;i++)
        if(adj[i].size()>=2)
        {
            dfs(i,0);
            break;
        }

    int output=(leaves.size()+1)/2;
    printf("%i\n",output);

    int step=leaves.size()-output;

    for(int i=0;i<output;i++)
    {
        printf("%i %i\n",leaves[i],leaves[i+step]);
    }

    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i",&n);
     ~~~~~^~~~~~~~~
net.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i%i",&u,&v);
         ~~~~~^~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 11 ms 12032 KB Output is correct
4 Correct 13 ms 12032 KB Output is correct
5 Correct 11 ms 12032 KB Output is correct
6 Correct 12 ms 12032 KB Output is correct
7 Correct 11 ms 12032 KB Output is correct
8 Correct 11 ms 12032 KB Output is correct
9 Correct 11 ms 12032 KB Output is correct
10 Correct 11 ms 12032 KB Output is correct
11 Correct 11 ms 12032 KB Output is correct
12 Correct 11 ms 12032 KB Output is correct
13 Correct 11 ms 12032 KB Output is correct
14 Correct 11 ms 12032 KB Output is correct
15 Correct 11 ms 12032 KB Output is correct
16 Correct 11 ms 12032 KB Output is correct
17 Correct 11 ms 12032 KB Output is correct
18 Correct 11 ms 12032 KB Output is correct
19 Correct 11 ms 12032 KB Output is correct
20 Correct 11 ms 12032 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 11 ms 12032 KB Output is correct
4 Correct 13 ms 12032 KB Output is correct
5 Correct 11 ms 12032 KB Output is correct
6 Correct 12 ms 12032 KB Output is correct
7 Correct 11 ms 12032 KB Output is correct
8 Correct 11 ms 12032 KB Output is correct
9 Correct 11 ms 12032 KB Output is correct
10 Correct 11 ms 12032 KB Output is correct
11 Correct 11 ms 12032 KB Output is correct
12 Correct 11 ms 12032 KB Output is correct
13 Correct 11 ms 12032 KB Output is correct
14 Correct 11 ms 12032 KB Output is correct
15 Correct 11 ms 12032 KB Output is correct
16 Correct 11 ms 12032 KB Output is correct
17 Correct 11 ms 12032 KB Output is correct
18 Correct 11 ms 12032 KB Output is correct
19 Correct 11 ms 12032 KB Output is correct
20 Correct 11 ms 12032 KB Output is correct
21 Correct 11 ms 12032 KB Output is correct
22 Correct 11 ms 12160 KB Output is correct
23 Correct 12 ms 12160 KB Output is correct
24 Correct 12 ms 12160 KB Output is correct
25 Correct 12 ms 12156 KB Output is correct
26 Correct 12 ms 12160 KB Output is correct
27 Correct 13 ms 12160 KB Output is correct
28 Correct 12 ms 12160 KB Output is correct
29 Correct 12 ms 12160 KB Output is correct
30 Correct 11 ms 12032 KB Output is correct
31 Correct 12 ms 12160 KB Output is correct
32 Correct 11 ms 12032 KB Output is correct
33 Correct 11 ms 12032 KB Output is correct
34 Correct 11 ms 12032 KB Output is correct
35 Correct 11 ms 12032 KB Output is correct
36 Correct 11 ms 12032 KB Output is correct
37 Correct 11 ms 12032 KB Output is correct
38 Correct 11 ms 12160 KB Output is correct
39 Correct 11 ms 12032 KB Output is correct
40 Correct 12 ms 12032 KB Output is correct
41 Correct 11 ms 12160 KB Output is correct
42 Correct 11 ms 12032 KB Output is correct
43 Correct 11 ms 12160 KB Output is correct
44 Correct 11 ms 12032 KB Output is correct
45 Correct 12 ms 12160 KB Output is correct
46 Correct 13 ms 12032 KB Output is correct
47 Correct 11 ms 12032 KB Output is correct
48 Correct 11 ms 12032 KB Output is correct
49 Correct 12 ms 12160 KB Output is correct
50 Correct 11 ms 12032 KB Output is correct
51 Correct 11 ms 12032 KB Output is correct
52 Correct 13 ms 12032 KB Output is correct
53 Correct 12 ms 12048 KB Output is correct
54 Correct 11 ms 12032 KB Output is correct
55 Correct 11 ms 12032 KB Output is correct
56 Correct 11 ms 12032 KB Output is correct
57 Correct 11 ms 12160 KB Output is correct
58 Correct 13 ms 12160 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 11 ms 12032 KB Output is correct
4 Correct 13 ms 12032 KB Output is correct
5 Correct 11 ms 12032 KB Output is correct
6 Correct 12 ms 12032 KB Output is correct
7 Correct 11 ms 12032 KB Output is correct
8 Correct 11 ms 12032 KB Output is correct
9 Correct 11 ms 12032 KB Output is correct
10 Correct 11 ms 12032 KB Output is correct
11 Correct 11 ms 12032 KB Output is correct
12 Correct 11 ms 12032 KB Output is correct
13 Correct 11 ms 12032 KB Output is correct
14 Correct 11 ms 12032 KB Output is correct
15 Correct 11 ms 12032 KB Output is correct
16 Correct 11 ms 12032 KB Output is correct
17 Correct 11 ms 12032 KB Output is correct
18 Correct 11 ms 12032 KB Output is correct
19 Correct 11 ms 12032 KB Output is correct
20 Correct 11 ms 12032 KB Output is correct
21 Correct 11 ms 12032 KB Output is correct
22 Correct 11 ms 12160 KB Output is correct
23 Correct 12 ms 12160 KB Output is correct
24 Correct 12 ms 12160 KB Output is correct
25 Correct 12 ms 12156 KB Output is correct
26 Correct 12 ms 12160 KB Output is correct
27 Correct 13 ms 12160 KB Output is correct
28 Correct 12 ms 12160 KB Output is correct
29 Correct 12 ms 12160 KB Output is correct
30 Correct 11 ms 12032 KB Output is correct
31 Correct 12 ms 12160 KB Output is correct
32 Correct 11 ms 12032 KB Output is correct
33 Correct 11 ms 12032 KB Output is correct
34 Correct 11 ms 12032 KB Output is correct
35 Correct 11 ms 12032 KB Output is correct
36 Correct 11 ms 12032 KB Output is correct
37 Correct 11 ms 12032 KB Output is correct
38 Correct 11 ms 12160 KB Output is correct
39 Correct 11 ms 12032 KB Output is correct
40 Correct 12 ms 12032 KB Output is correct
41 Correct 11 ms 12160 KB Output is correct
42 Correct 11 ms 12032 KB Output is correct
43 Correct 11 ms 12160 KB Output is correct
44 Correct 11 ms 12032 KB Output is correct
45 Correct 12 ms 12160 KB Output is correct
46 Correct 13 ms 12032 KB Output is correct
47 Correct 11 ms 12032 KB Output is correct
48 Correct 11 ms 12032 KB Output is correct
49 Correct 12 ms 12160 KB Output is correct
50 Correct 11 ms 12032 KB Output is correct
51 Correct 11 ms 12032 KB Output is correct
52 Correct 13 ms 12032 KB Output is correct
53 Correct 12 ms 12048 KB Output is correct
54 Correct 11 ms 12032 KB Output is correct
55 Correct 11 ms 12032 KB Output is correct
56 Correct 11 ms 12032 KB Output is correct
57 Correct 11 ms 12160 KB Output is correct
58 Correct 13 ms 12160 KB Output is correct
59 Correct 381 ms 34400 KB Output is correct
60 Correct 472 ms 36584 KB Output is correct
61 Correct 11 ms 12032 KB Output is correct
62 Correct 11 ms 12032 KB Output is correct
63 Correct 341 ms 32608 KB Output is correct
64 Correct 14 ms 12544 KB Output is correct
65 Correct 23 ms 13952 KB Output is correct
66 Correct 166 ms 27896 KB Output is correct
67 Correct 519 ms 44580 KB Output is correct
68 Correct 515 ms 45300 KB Output is correct
69 Correct 18 ms 12928 KB Output is correct
70 Correct 111 ms 21328 KB Output is correct
71 Correct 324 ms 39468 KB Output is correct
72 Correct 361 ms 38624 KB Output is correct
73 Correct 103 ms 19184 KB Output is correct
74 Correct 469 ms 35312 KB Output is correct
75 Correct 36 ms 15232 KB Output is correct
76 Correct 337 ms 39164 KB Output is correct
77 Correct 321 ms 39376 KB Output is correct
78 Correct 43 ms 15608 KB Output is correct
79 Correct 511 ms 42744 KB Output is correct
80 Correct 13 ms 12288 KB Output is correct
81 Correct 119 ms 21360 KB Output is correct
82 Correct 395 ms 37352 KB Output is correct
83 Correct 473 ms 35180 KB Output is correct
84 Correct 464 ms 35180 KB Output is correct
85 Correct 471 ms 35056 KB Output is correct
86 Correct 455 ms 35940 KB Output is correct
87 Correct 462 ms 36068 KB Output is correct