oj.uz

Submission #520162

# Submission time Handle Problem Language Result Execution time Memory
520162 2022-01-28T15:55:44 Z krit3379 Network (BOI15_net) C++14
100 / 100
 449 ms 47556 KB 
#include<bits/stdc++.h>
using namespace std;
#define N 500005

vector<int> g[N],v;

void dfs(int s,int f){
    if(g[s].size()==1)v.push_back(s);
    for(auto x:g[s]){
        if(x==f)continue;
        dfs(x,s);
    }
}

int main(){
    int n,i,a,b,ans;
    scanf("%d",&n);
    for(i=1;i<n;i++){
        scanf("%d %d",&a,&b);
        g[a].push_back(b);
        g[b].push_back(a);
    }
    dfs(1,0);
    printf("%d\n",ans=(v.size()+1)/2);
    for(i=0;i<ans;i++)printf("%d %d\n",v[i],(i+ans<v.size())?v[i+ans]:v[0]);
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:25:51: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(i=0;i<ans;i++)printf("%d %d\n",v[i],(i+ans<v.size())?v[i+ans]:v[0]);
      |                                              ~~~~~^~~~~~~~~
net.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
net.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         scanf("%d %d",&a,&b);
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12108 KB Output is correct
2 Correct 6 ms 11980 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 12032 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12036 KB Output is correct
7 Correct 6 ms 11928 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 6 ms 12036 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 7 ms 11980 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12032 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 12032 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12108 KB Output is correct
2 Correct 6 ms 11980 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 12032 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12036 KB Output is correct
7 Correct 6 ms 11928 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 6 ms 12036 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 7 ms 11980 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12032 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 12032 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct
21 Correct 9 ms 11980 KB Output is correct
22 Correct 7 ms 12108 KB Output is correct
23 Correct 7 ms 12108 KB Output is correct
24 Correct 7 ms 12048 KB Output is correct
25 Correct 11 ms 12176 KB Output is correct
26 Correct 7 ms 12044 KB Output is correct
27 Correct 8 ms 12108 KB Output is correct
28 Correct 7 ms 12108 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12032 KB Output is correct
31 Correct 10 ms 12108 KB Output is correct
32 Correct 7 ms 12036 KB Output is correct
33 Correct 8 ms 12040 KB Output is correct
34 Correct 7 ms 12040 KB Output is correct
35 Correct 6 ms 12036 KB Output is correct
36 Correct 6 ms 11980 KB Output is correct
37 Correct 7 ms 11980 KB Output is correct
38 Correct 6 ms 12108 KB Output is correct
39 Correct 6 ms 11976 KB Output is correct
40 Correct 6 ms 12040 KB Output is correct
41 Correct 6 ms 11980 KB Output is correct
42 Correct 9 ms 12032 KB Output is correct
43 Correct 7 ms 11980 KB Output is correct
44 Correct 7 ms 11980 KB Output is correct
45 Correct 9 ms 12012 KB Output is correct
46 Correct 7 ms 12040 KB Output is correct
47 Correct 6 ms 11980 KB Output is correct
48 Correct 6 ms 12036 KB Output is correct
49 Correct 7 ms 11988 KB Output is correct
50 Correct 6 ms 11980 KB Output is correct
51 Correct 7 ms 11980 KB Output is correct
52 Correct 7 ms 12048 KB Output is correct
53 Correct 9 ms 12076 KB Output is correct
54 Correct 6 ms 12040 KB Output is correct
55 Correct 6 ms 12032 KB Output is correct
56 Correct 6 ms 11980 KB Output is correct
57 Correct 6 ms 11980 KB Output is correct
58 Correct 7 ms 12048 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12108 KB Output is correct
2 Correct 6 ms 11980 KB Output is correct
3 Correct 6 ms 11980 KB Output is correct
4 Correct 7 ms 12032 KB Output is correct
5 Correct 6 ms 11980 KB Output is correct
6 Correct 6 ms 12036 KB Output is correct
7 Correct 6 ms 11928 KB Output is correct
8 Correct 6 ms 11980 KB Output is correct
9 Correct 6 ms 11980 KB Output is correct
10 Correct 7 ms 11980 KB Output is correct
11 Correct 6 ms 12036 KB Output is correct
12 Correct 6 ms 11980 KB Output is correct
13 Correct 7 ms 11980 KB Output is correct
14 Correct 6 ms 11980 KB Output is correct
15 Correct 7 ms 12032 KB Output is correct
16 Correct 6 ms 11988 KB Output is correct
17 Correct 6 ms 11980 KB Output is correct
18 Correct 7 ms 12032 KB Output is correct
19 Correct 6 ms 11980 KB Output is correct
20 Correct 6 ms 11980 KB Output is correct
21 Correct 9 ms 11980 KB Output is correct
22 Correct 7 ms 12108 KB Output is correct
23 Correct 7 ms 12108 KB Output is correct
24 Correct 7 ms 12048 KB Output is correct
25 Correct 11 ms 12176 KB Output is correct
26 Correct 7 ms 12044 KB Output is correct
27 Correct 8 ms 12108 KB Output is correct
28 Correct 7 ms 12108 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 7 ms 12032 KB Output is correct
31 Correct 10 ms 12108 KB Output is correct
32 Correct 7 ms 12036 KB Output is correct
33 Correct 8 ms 12040 KB Output is correct
34 Correct 7 ms 12040 KB Output is correct
35 Correct 6 ms 12036 KB Output is correct
36 Correct 6 ms 11980 KB Output is correct
37 Correct 7 ms 11980 KB Output is correct
38 Correct 6 ms 12108 KB Output is correct
39 Correct 6 ms 11976 KB Output is correct
40 Correct 6 ms 12040 KB Output is correct
41 Correct 6 ms 11980 KB Output is correct
42 Correct 9 ms 12032 KB Output is correct
43 Correct 7 ms 11980 KB Output is correct
44 Correct 7 ms 11980 KB Output is correct
45 Correct 9 ms 12012 KB Output is correct
46 Correct 7 ms 12040 KB Output is correct
47 Correct 6 ms 11980 KB Output is correct
48 Correct 6 ms 12036 KB Output is correct
49 Correct 7 ms 11988 KB Output is correct
50 Correct 6 ms 11980 KB Output is correct
51 Correct 7 ms 11980 KB Output is correct
52 Correct 7 ms 12048 KB Output is correct
53 Correct 9 ms 12076 KB Output is correct
54 Correct 6 ms 12040 KB Output is correct
55 Correct 6 ms 12032 KB Output is correct
56 Correct 6 ms 11980 KB Output is correct
57 Correct 6 ms 11980 KB Output is correct
58 Correct 7 ms 12048 KB Output is correct
59 Correct 325 ms 35992 KB Output is correct
60 Correct 381 ms 38688 KB Output is correct
61 Correct 7 ms 12040 KB Output is correct
62 Correct 7 ms 11980 KB Output is correct
63 Correct 260 ms 33536 KB Output is correct
64 Correct 9 ms 12364 KB Output is correct
65 Correct 21 ms 13816 KB Output is correct
66 Correct 121 ms 27812 KB Output is correct
67 Correct 440 ms 46872 KB Output is correct
68 Correct 449 ms 47556 KB Output is correct
69 Correct 12 ms 12876 KB Output is correct
70 Correct 87 ms 21236 KB Output is correct
71 Correct 280 ms 41760 KB Output is correct
72 Correct 302 ms 40628 KB Output is correct
73 Correct 78 ms 18928 KB Output is correct
74 Correct 440 ms 37648 KB Output is correct
75 Correct 29 ms 15176 KB Output is correct
76 Correct 312 ms 41548 KB Output is correct
77 Correct 284 ms 41564 KB Output is correct
78 Correct 32 ms 15224 KB Output is correct
79 Correct 424 ms 45200 KB Output is correct
80 Correct 8 ms 12256 KB Output is correct
81 Correct 90 ms 21176 KB Output is correct
82 Correct 370 ms 39496 KB Output is correct
83 Correct 405 ms 37696 KB Output is correct
84 Correct 416 ms 37652 KB Output is correct
85 Correct 400 ms 37632 KB Output is correct
86 Correct 384 ms 38712 KB Output is correct
87 Correct 393 ms 38772 KB Output is correct