oj.uz

Submission #394658

# Submission time Handle Problem Language Result Execution time Memory
394658 2021-04-27T07:02:38 Z armanmohammadi Network (BOI15_net) C++14
100 / 100
 786 ms 53100 KB 
/*
 _________        .---"""      """---.
:______.-':      :  .--------------.  :
| ______  |      | :                : |
|:______B:|      | |  Little Error: | |
|:______B:|      | |                | |
|:______B:|      | |  Power not     | |
|         |      | |  found.        | |
|:_____:  |      | |                | |
|    ==   |      | :                : |
|       O |      :  '--------------'  :
|       o |      :'---...______...---'
|       o |-._.-i___/'             \._
|'-.____o_|   '-.   '-...______...-'  `-._
:_________:      `.____________________   `-.___.-.
                 .'.eeeeeeeeeeeeeeeeee.'.      :___:
    fsc        .'.eeeeeeeeeeeeeeeeeeeeee.'.
              :____________________________:
*/




//in the name of god
//if you read this code please search about imam hussain
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

#define pb push_back
#define endl "\n"
#define X first
#define Y second
#define pii pair<int,int>
#define migmig ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define read freopen("input.txt", "r", stdin);freopen("output.txt", "w", stdout)

const int maxn=5e5+5;
const int mod=1e9+7;
const int inf=1e9;
const int del=728729;

ll poww(ll a, ll b, ll md) {return (!b ? 1 : (b & 1 ? a * poww(a * a % md, b / 2, md) % md : poww(a * a % md, b / 2, md) % md));}


int n ;
int deg ;
int DD[maxn];
vector<int> B ;
vector<int> adj[maxn];
int cnt ;
void dfs(int v, int P = 0){
	DD[v] = deg++;
	for(auto u : adj[v]){
		if(u == P){
			continue;
		} 
		dfs(u, v);
	}
}
 
bool cmp(int i, int j){
	return DD[i] < DD[j];
}
 
int main(){
	cin >> n ;
	int root =1 ;
	for(int i = 1; i < n ;i ++){
		int x ;
		int y ;
		cin >> x >> y ;
		adj[x].push_back(y) ;
		adj[y].push_back(x) ;
	}
	for(int i = 1; i <= n; i ++){
		if(adj[i].size() > 1){
			root = i;
		}
		if(adj[i].size() == 1){
			B.pb(i);
			cnt++;
		}
	}
	dfs(root);
	sort(B.begin() , B.end() , cmp);
	cout<<(cnt + 1 ) / 2 <<endl ; 
	cnt = (cnt + 1) / 2 ; 
	for(int i = 0 ; i + cnt < B.size() ; i ++ ){
		cout<<B[i] <<" " << B[i + cnt] << endl ; 
	}
	if(B.size() % 2 == 1){
		cout<<B[cnt-1] <<" " << B[0] << endl ; 
	}
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:91:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |  for(int i = 0 ; i + cnt < B.size() ; i ++ ){
      |                  ~~~~~~~~^~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 11980 KB Output is correct
2 Correct 9 ms 11980 KB Output is correct
3 Correct 8 ms 11980 KB Output is correct
4 Correct 8 ms 11980 KB Output is correct
5 Correct 8 ms 11980 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 11980 KB Output is correct
9 Correct 8 ms 11984 KB Output is correct
10 Correct 8 ms 11976 KB Output is correct
11 Correct 9 ms 11980 KB Output is correct
12 Correct 8 ms 11980 KB Output is correct
13 Correct 8 ms 11980 KB Output is correct
14 Correct 9 ms 11980 KB Output is correct
15 Correct 9 ms 11980 KB Output is correct
16 Correct 8 ms 12052 KB Output is correct
17 Correct 8 ms 11996 KB Output is correct
18 Correct 8 ms 11980 KB Output is correct
19 Correct 8 ms 11956 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 9 ms 11980 KB Output is correct
3 Correct 8 ms 11980 KB Output is correct
4 Correct 8 ms 11980 KB Output is correct
5 Correct 8 ms 11980 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 11980 KB Output is correct
9 Correct 8 ms 11984 KB Output is correct
10 Correct 8 ms 11976 KB Output is correct
11 Correct 9 ms 11980 KB Output is correct
12 Correct 8 ms 11980 KB Output is correct
13 Correct 8 ms 11980 KB Output is correct
14 Correct 9 ms 11980 KB Output is correct
15 Correct 9 ms 11980 KB Output is correct
16 Correct 8 ms 12052 KB Output is correct
17 Correct 8 ms 11996 KB Output is correct
18 Correct 8 ms 11980 KB Output is correct
19 Correct 8 ms 11956 KB Output is correct
20 Correct 8 ms 11980 KB Output is correct
21 Correct 8 ms 11980 KB Output is correct
22 Correct 10 ms 12108 KB Output is correct
23 Correct 10 ms 12108 KB Output is correct
24 Correct 10 ms 12140 KB Output is correct
25 Correct 9 ms 12108 KB Output is correct
26 Correct 9 ms 12048 KB Output is correct
27 Correct 9 ms 12108 KB Output is correct
28 Correct 10 ms 12108 KB Output is correct
29 Correct 9 ms 12108 KB Output is correct
30 Correct 8 ms 11960 KB Output is correct
31 Correct 9 ms 12048 KB Output is correct
32 Correct 9 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 11980 KB Output is correct
38 Correct 8 ms 12112 KB Output is correct
39 Correct 8 ms 11980 KB Output is correct
40 Correct 9 ms 12024 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 12048 KB Output is correct
44 Correct 8 ms 11932 KB Output is correct
45 Correct 8 ms 11980 KB Output is correct
46 Correct 9 ms 11980 KB Output is correct
47 Correct 8 ms 11984 KB Output is correct
48 Correct 9 ms 11980 KB Output is correct
49 Correct 9 ms 12100 KB Output is correct
50 Correct 8 ms 11980 KB Output is correct
51 Correct 8 ms 11948 KB Output is correct
52 Correct 8 ms 11984 KB Output is correct
53 Correct 9 ms 11980 KB Output is correct
54 Correct 8 ms 12044 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 8 ms 11980 KB Output is correct
57 Correct 9 ms 11980 KB Output is correct
58 Correct 10 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 9 ms 11980 KB Output is correct
3 Correct 8 ms 11980 KB Output is correct
4 Correct 8 ms 11980 KB Output is correct
5 Correct 8 ms 11980 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 11980 KB Output is correct
9 Correct 8 ms 11984 KB Output is correct
10 Correct 8 ms 11976 KB Output is correct
11 Correct 9 ms 11980 KB Output is correct
12 Correct 8 ms 11980 KB Output is correct
13 Correct 8 ms 11980 KB Output is correct
14 Correct 9 ms 11980 KB Output is correct
15 Correct 9 ms 11980 KB Output is correct
16 Correct 8 ms 12052 KB Output is correct
17 Correct 8 ms 11996 KB Output is correct
18 Correct 8 ms 11980 KB Output is correct
19 Correct 8 ms 11956 KB Output is correct
20 Correct 8 ms 11980 KB Output is correct
21 Correct 8 ms 11980 KB Output is correct
22 Correct 10 ms 12108 KB Output is correct
23 Correct 10 ms 12108 KB Output is correct
24 Correct 10 ms 12140 KB Output is correct
25 Correct 9 ms 12108 KB Output is correct
26 Correct 9 ms 12048 KB Output is correct
27 Correct 9 ms 12108 KB Output is correct
28 Correct 10 ms 12108 KB Output is correct
29 Correct 9 ms 12108 KB Output is correct
30 Correct 8 ms 11960 KB Output is correct
31 Correct 9 ms 12048 KB Output is correct
32 Correct 9 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 11980 KB Output is correct
38 Correct 8 ms 12112 KB Output is correct
39 Correct 8 ms 11980 KB Output is correct
40 Correct 9 ms 12024 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 12048 KB Output is correct
44 Correct 8 ms 11932 KB Output is correct
45 Correct 8 ms 11980 KB Output is correct
46 Correct 9 ms 11980 KB Output is correct
47 Correct 8 ms 11984 KB Output is correct
48 Correct 9 ms 11980 KB Output is correct
49 Correct 9 ms 12100 KB Output is correct
50 Correct 8 ms 11980 KB Output is correct
51 Correct 8 ms 11948 KB Output is correct
52 Correct 8 ms 11984 KB Output is correct
53 Correct 9 ms 11980 KB Output is correct
54 Correct 8 ms 12044 KB Output is correct
55 Correct 8 ms 11980 KB Output is correct
56 Correct 8 ms 11980 KB Output is correct
57 Correct 9 ms 11980 KB Output is correct
58 Correct 10 ms 12108 KB Output is correct
59 Correct 631 ms 31756 KB Output is correct
60 Correct 739 ms 34012 KB Output is correct
61 Correct 8 ms 11984 KB Output is correct
62 Correct 8 ms 11980 KB Output is correct
63 Correct 554 ms 29744 KB Output is correct
64 Correct 12 ms 12364 KB Output is correct
65 Correct 27 ms 13508 KB Output is correct
66 Correct 219 ms 23596 KB Output is correct
67 Correct 786 ms 53100 KB Output is correct
68 Correct 769 ms 45824 KB Output is correct
69 Correct 22 ms 12748 KB Output is correct
70 Correct 186 ms 19812 KB Output is correct
71 Correct 656 ms 37060 KB Output is correct
72 Correct 644 ms 36244 KB Output is correct
73 Correct 168 ms 17848 KB Output is correct
74 Correct 769 ms 33032 KB Output is correct
75 Correct 65 ms 14820 KB Output is correct
76 Correct 642 ms 36752 KB Output is correct
77 Correct 630 ms 37136 KB Output is correct
78 Correct 72 ms 15020 KB Output is correct
79 Correct 716 ms 40420 KB Output is correct
80 Correct 11 ms 12236 KB Output is correct
81 Correct 218 ms 19848 KB Output is correct
82 Correct 743 ms 35040 KB Output is correct
83 Correct 725 ms 32952 KB Output is correct
84 Correct 739 ms 33044 KB Output is correct
85 Correct 727 ms 33080 KB Output is correct
86 Correct 745 ms 34048 KB Output is correct
87 Correct 756 ms 33984 KB Output is correct