oj.uz

Submission #113784

# Submission time Handle Problem Language Result Execution time Memory
113784 2019-05-28T08:59:42 Z Mercenary Network (BOI15_net) C++14
100 / 100
 613 ms 47868 KB 
#include<bits/stdc++.h>

using namespace std;
#define taskname "A"
#define pb	push_back
#define mp 	make_pair
#ifndef LOCAL
#define cerr if(0)cout
#endif

typedef long double ld;
typedef long long ll;
typedef pair<int,int> ii;
const int maxn = 5e5 + 6;

int n , m;
vector<int> leaf , adj[maxn];

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

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n;
    for(int i = 1 ; i < n ; ++i){
        int u , v;cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    int root = 1;
    for(int i = 1 ; i <= n ; ++i){
        if(adj[i].size() != 1){
            dfs(i , 0);
            break;
        }else root = i;
    }
    if(leaf.size() % 2)leaf.pb(leaf.back());
    cout << leaf.size() / 2 << endl;
    for(int i = 0 ; i < leaf.size() / 2 ; i++){
        cout << leaf[i] << " " << leaf[i + leaf.size() / 2] << '\n';
    }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0 ; i < leaf.size() / 2 ; i++){
                     ~~^~~~~~~~~~~~~~~~~
net.cpp:42:9: warning: variable 'root' set but not used [-Wunused-but-set-variable]
     int root = 1;
         ^~~~
net.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
net.cpp:34:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12160 KB Output is correct
2 Correct 12 ms 12160 KB Output is correct
3 Correct 13 ms 12288 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 13 ms 12160 KB Output is correct
6 Correct 11 ms 12160 KB Output is correct
7 Correct 13 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 12 ms 12032 KB Output is correct
11 Correct 11 ms 12032 KB Output is correct
12 Correct 12 ms 12032 KB Output is correct
13 Correct 13 ms 12032 KB Output is correct
14 Correct 11 ms 12160 KB Output is correct
15 Correct 12 ms 12032 KB Output is correct
16 Correct 13 ms 12160 KB Output is correct
17 Correct 13 ms 12032 KB Output is correct
18 Correct 13 ms 12160 KB Output is correct
19 Correct 12 ms 12036 KB Output is correct
20 Correct 12 ms 12032 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12160 KB Output is correct
2 Correct 12 ms 12160 KB Output is correct
3 Correct 13 ms 12288 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 13 ms 12160 KB Output is correct
6 Correct 11 ms 12160 KB Output is correct
7 Correct 13 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 12 ms 12032 KB Output is correct
11 Correct 11 ms 12032 KB Output is correct
12 Correct 12 ms 12032 KB Output is correct
13 Correct 13 ms 12032 KB Output is correct
14 Correct 11 ms 12160 KB Output is correct
15 Correct 12 ms 12032 KB Output is correct
16 Correct 13 ms 12160 KB Output is correct
17 Correct 13 ms 12032 KB Output is correct
18 Correct 13 ms 12160 KB Output is correct
19 Correct 12 ms 12036 KB Output is correct
20 Correct 12 ms 12032 KB Output is correct
21 Correct 13 ms 12032 KB Output is correct
22 Correct 13 ms 12288 KB Output is correct
23 Correct 12 ms 12160 KB Output is correct
24 Correct 12 ms 12288 KB Output is correct
25 Correct 14 ms 12160 KB Output is correct
26 Correct 12 ms 12160 KB Output is correct
27 Correct 13 ms 12288 KB Output is correct
28 Correct 13 ms 12288 KB Output is correct
29 Correct 12 ms 12160 KB Output is correct
30 Correct 12 ms 12160 KB Output is correct
31 Correct 13 ms 12288 KB Output is correct
32 Correct 12 ms 12032 KB Output is correct
33 Correct 12 ms 12160 KB Output is correct
34 Correct 12 ms 12032 KB Output is correct
35 Correct 12 ms 12032 KB Output is correct
36 Correct 12 ms 12032 KB Output is correct
37 Correct 12 ms 12160 KB Output is correct
38 Correct 12 ms 12160 KB Output is correct
39 Correct 13 ms 12076 KB Output is correct
40 Correct 13 ms 12160 KB Output is correct
41 Correct 12 ms 12032 KB Output is correct
42 Correct 12 ms 12160 KB Output is correct
43 Correct 13 ms 12160 KB Output is correct
44 Correct 13 ms 12160 KB Output is correct
45 Correct 12 ms 12032 KB Output is correct
46 Correct 13 ms 12160 KB Output is correct
47 Correct 11 ms 12160 KB Output is correct
48 Correct 11 ms 12032 KB Output is correct
49 Correct 13 ms 12132 KB Output is correct
50 Correct 12 ms 12032 KB Output is correct
51 Correct 12 ms 12104 KB Output is correct
52 Correct 11 ms 12032 KB Output is correct
53 Correct 12 ms 12160 KB Output is correct
54 Correct 12 ms 12160 KB Output is correct
55 Correct 12 ms 12132 KB Output is correct
56 Correct 11 ms 12032 KB Output is correct
57 Correct 12 ms 12132 KB Output is correct
58 Correct 12 ms 12160 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12160 KB Output is correct
2 Correct 12 ms 12160 KB Output is correct
3 Correct 13 ms 12288 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 13 ms 12160 KB Output is correct
6 Correct 11 ms 12160 KB Output is correct
7 Correct 13 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 12 ms 12032 KB Output is correct
11 Correct 11 ms 12032 KB Output is correct
12 Correct 12 ms 12032 KB Output is correct
13 Correct 13 ms 12032 KB Output is correct
14 Correct 11 ms 12160 KB Output is correct
15 Correct 12 ms 12032 KB Output is correct
16 Correct 13 ms 12160 KB Output is correct
17 Correct 13 ms 12032 KB Output is correct
18 Correct 13 ms 12160 KB Output is correct
19 Correct 12 ms 12036 KB Output is correct
20 Correct 12 ms 12032 KB Output is correct
21 Correct 13 ms 12032 KB Output is correct
22 Correct 13 ms 12288 KB Output is correct
23 Correct 12 ms 12160 KB Output is correct
24 Correct 12 ms 12288 KB Output is correct
25 Correct 14 ms 12160 KB Output is correct
26 Correct 12 ms 12160 KB Output is correct
27 Correct 13 ms 12288 KB Output is correct
28 Correct 13 ms 12288 KB Output is correct
29 Correct 12 ms 12160 KB Output is correct
30 Correct 12 ms 12160 KB Output is correct
31 Correct 13 ms 12288 KB Output is correct
32 Correct 12 ms 12032 KB Output is correct
33 Correct 12 ms 12160 KB Output is correct
34 Correct 12 ms 12032 KB Output is correct
35 Correct 12 ms 12032 KB Output is correct
36 Correct 12 ms 12032 KB Output is correct
37 Correct 12 ms 12160 KB Output is correct
38 Correct 12 ms 12160 KB Output is correct
39 Correct 13 ms 12076 KB Output is correct
40 Correct 13 ms 12160 KB Output is correct
41 Correct 12 ms 12032 KB Output is correct
42 Correct 12 ms 12160 KB Output is correct
43 Correct 13 ms 12160 KB Output is correct
44 Correct 13 ms 12160 KB Output is correct
45 Correct 12 ms 12032 KB Output is correct
46 Correct 13 ms 12160 KB Output is correct
47 Correct 11 ms 12160 KB Output is correct
48 Correct 11 ms 12032 KB Output is correct
49 Correct 13 ms 12132 KB Output is correct
50 Correct 12 ms 12032 KB Output is correct
51 Correct 12 ms 12104 KB Output is correct
52 Correct 11 ms 12032 KB Output is correct
53 Correct 12 ms 12160 KB Output is correct
54 Correct 12 ms 12160 KB Output is correct
55 Correct 12 ms 12132 KB Output is correct
56 Correct 11 ms 12032 KB Output is correct
57 Correct 12 ms 12132 KB Output is correct
58 Correct 12 ms 12160 KB Output is correct
59 Correct 414 ms 36152 KB Output is correct
60 Correct 489 ms 38988 KB Output is correct
61 Correct 12 ms 12160 KB Output is correct
62 Correct 11 ms 12160 KB Output is correct
63 Correct 347 ms 33640 KB Output is correct
64 Correct 13 ms 12544 KB Output is correct
65 Correct 25 ms 13952 KB Output is correct
66 Correct 166 ms 27988 KB Output is correct
67 Correct 596 ms 46944 KB Output is correct
68 Correct 594 ms 47868 KB Output is correct
69 Correct 18 ms 12928 KB Output is correct
70 Correct 103 ms 21368 KB Output is correct
71 Correct 346 ms 42080 KB Output is correct
72 Correct 356 ms 40808 KB Output is correct
73 Correct 120 ms 19296 KB Output is correct
74 Correct 501 ms 37740 KB Output is correct
75 Correct 37 ms 15324 KB Output is correct
76 Correct 346 ms 41556 KB Output is correct
77 Correct 350 ms 41732 KB Output is correct
78 Correct 54 ms 15736 KB Output is correct
79 Correct 613 ms 45272 KB Output is correct
80 Correct 13 ms 12372 KB Output is correct
81 Correct 116 ms 21488 KB Output is correct
82 Correct 433 ms 39704 KB Output is correct
83 Correct 523 ms 37740 KB Output is correct
84 Correct 531 ms 37756 KB Output is correct
85 Correct 524 ms 37868 KB Output is correct
86 Correct 488 ms 39000 KB Output is correct
87 Correct 511 ms 38888 KB Output is correct