답안 #765401

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
765401	2023-06-24T12:19:31 Z	vjudge1	Network (BOI15_net)	C++17	100 / 100	998 ms	84680 KB

/******************
tree-bends-in-youth
//24///06///2023///
******************/
#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pb push_back
#define all(x) x.begin(), x.end()
using namespace std;
const ll N = 1e6 + 1;
const ll INF = 1e17;
const ll MOD = 1e9 + 7;
vector<int>g[N];
vector <int> l;
map<int,int>used;
int tm;
void dfs(int v){
    used[v]=1;
    if(g[v].size() == 1)l.pb(v);
    for(ll to : g[v]){
        if(!used[to]){
            dfs(to);
        }
    }
}
void solve(){
    int n;
    cin >> n;
    for(int i=1;i<n;i++){
        int x,y;
        cin>>x>>y;
        g[x].pb(y);
        g[y].pb(x);
    }
    int r = 0;
    for(int i = 1;i <= n;i++){
        if(g[i].size() > 1){
            r = i;
            break;
        }
    }
    dfs(r);
    int k = (l.size() + 1) / 2;
    cout << k << '\n';
    for(int i = 0;i + k < l.size();i++){
        cout << l[i] << " " << l[i + k] << '\n';
    }
    if(l.size() % 2){
        cout << l[0] << " " << l[k - 1] << '\n';
    }
}
main () {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
	//freopen("censor.in","r",stdin);
	//freopen("censor.out","w",stdout);
    ll T = 1;
    //cin >> T;
    for(ll i = 1;i <= T;i++){
      //  cout << "Case " << i << ":\n";
        solve();
    }
}

Compilation message

net.cpp: In function 'void solve()':
net.cpp:47:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     for(int i = 0;i + k < l.size();i++){
      |                   ~~~~~~^~~~~~~~~~
net.cpp: At global scope:
net.cpp:54:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   54 | main () {
      | ^~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	23764 KB	Output is correct
2	Correct	11 ms	23768 KB	Output is correct
3	Correct	11 ms	23720 KB	Output is correct
4	Correct	11 ms	23764 KB	Output is correct
5	Correct	12 ms	23808 KB	Output is correct
6	Correct	11 ms	23784 KB	Output is correct
7	Correct	14 ms	23764 KB	Output is correct
8	Correct	13 ms	23808 KB	Output is correct
9	Correct	11 ms	23764 KB	Output is correct
10	Correct	13 ms	23804 KB	Output is correct
11	Correct	12 ms	23680 KB	Output is correct
12	Correct	11 ms	23764 KB	Output is correct
13	Correct	11 ms	23764 KB	Output is correct
14	Correct	12 ms	23776 KB	Output is correct
15	Correct	12 ms	23764 KB	Output is correct
16	Correct	12 ms	23740 KB	Output is correct
17	Correct	12 ms	23764 KB	Output is correct
18	Correct	12 ms	23804 KB	Output is correct
19	Correct	11 ms	23784 KB	Output is correct
20	Correct	12 ms	23736 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	23764 KB	Output is correct
2	Correct	11 ms	23768 KB	Output is correct
3	Correct	11 ms	23720 KB	Output is correct
4	Correct	11 ms	23764 KB	Output is correct
5	Correct	12 ms	23808 KB	Output is correct
6	Correct	11 ms	23784 KB	Output is correct
7	Correct	14 ms	23764 KB	Output is correct
8	Correct	13 ms	23808 KB	Output is correct
9	Correct	11 ms	23764 KB	Output is correct
10	Correct	13 ms	23804 KB	Output is correct
11	Correct	12 ms	23680 KB	Output is correct
12	Correct	11 ms	23764 KB	Output is correct
13	Correct	11 ms	23764 KB	Output is correct
14	Correct	12 ms	23776 KB	Output is correct
15	Correct	12 ms	23764 KB	Output is correct
16	Correct	12 ms	23740 KB	Output is correct
17	Correct	12 ms	23764 KB	Output is correct
18	Correct	12 ms	23804 KB	Output is correct
19	Correct	11 ms	23784 KB	Output is correct
20	Correct	12 ms	23736 KB	Output is correct
21	Correct	11 ms	23764 KB	Output is correct
22	Correct	12 ms	23984 KB	Output is correct
23	Correct	12 ms	23892 KB	Output is correct
24	Correct	12 ms	23892 KB	Output is correct
25	Correct	12 ms	23892 KB	Output is correct
26	Correct	13 ms	23888 KB	Output is correct
27	Correct	12 ms	23968 KB	Output is correct
28	Correct	13 ms	23976 KB	Output is correct
29	Correct	13 ms	23892 KB	Output is correct
30	Correct	11 ms	23764 KB	Output is correct
31	Correct	12 ms	23892 KB	Output is correct
32	Correct	12 ms	23804 KB	Output is correct
33	Correct	11 ms	23764 KB	Output is correct
34	Correct	12 ms	23764 KB	Output is correct
35	Correct	11 ms	23792 KB	Output is correct
36	Correct	11 ms	23704 KB	Output is correct
37	Correct	12 ms	23764 KB	Output is correct
38	Correct	12 ms	23844 KB	Output is correct
39	Correct	11 ms	23764 KB	Output is correct
40	Correct	11 ms	23752 KB	Output is correct
41	Correct	11 ms	23764 KB	Output is correct
42	Correct	12 ms	23728 KB	Output is correct
43	Correct	11 ms	23804 KB	Output is correct
44	Correct	14 ms	23804 KB	Output is correct
45	Correct	12 ms	23764 KB	Output is correct
46	Correct	12 ms	23892 KB	Output is correct
47	Correct	11 ms	23700 KB	Output is correct
48	Correct	12 ms	23836 KB	Output is correct
49	Correct	15 ms	23892 KB	Output is correct
50	Correct	15 ms	23724 KB	Output is correct
51	Correct	11 ms	23740 KB	Output is correct
52	Correct	11 ms	23816 KB	Output is correct
53	Correct	13 ms	23840 KB	Output is correct
54	Correct	11 ms	23764 KB	Output is correct
55	Correct	11 ms	23832 KB	Output is correct
56	Correct	10 ms	23720 KB	Output is correct
57	Correct	11 ms	23856 KB	Output is correct
58	Correct	11 ms	23888 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	23764 KB	Output is correct
2	Correct	11 ms	23768 KB	Output is correct
3	Correct	11 ms	23720 KB	Output is correct
4	Correct	11 ms	23764 KB	Output is correct
5	Correct	12 ms	23808 KB	Output is correct
6	Correct	11 ms	23784 KB	Output is correct
7	Correct	14 ms	23764 KB	Output is correct
8	Correct	13 ms	23808 KB	Output is correct
9	Correct	11 ms	23764 KB	Output is correct
10	Correct	13 ms	23804 KB	Output is correct
11	Correct	12 ms	23680 KB	Output is correct
12	Correct	11 ms	23764 KB	Output is correct
13	Correct	11 ms	23764 KB	Output is correct
14	Correct	12 ms	23776 KB	Output is correct
15	Correct	12 ms	23764 KB	Output is correct
16	Correct	12 ms	23740 KB	Output is correct
17	Correct	12 ms	23764 KB	Output is correct
18	Correct	12 ms	23804 KB	Output is correct
19	Correct	11 ms	23784 KB	Output is correct
20	Correct	12 ms	23736 KB	Output is correct
21	Correct	11 ms	23764 KB	Output is correct
22	Correct	12 ms	23984 KB	Output is correct
23	Correct	12 ms	23892 KB	Output is correct
24	Correct	12 ms	23892 KB	Output is correct
25	Correct	12 ms	23892 KB	Output is correct
26	Correct	13 ms	23888 KB	Output is correct
27	Correct	12 ms	23968 KB	Output is correct
28	Correct	13 ms	23976 KB	Output is correct
29	Correct	13 ms	23892 KB	Output is correct
30	Correct	11 ms	23764 KB	Output is correct
31	Correct	12 ms	23892 KB	Output is correct
32	Correct	12 ms	23804 KB	Output is correct
33	Correct	11 ms	23764 KB	Output is correct
34	Correct	12 ms	23764 KB	Output is correct
35	Correct	11 ms	23792 KB	Output is correct
36	Correct	11 ms	23704 KB	Output is correct
37	Correct	12 ms	23764 KB	Output is correct
38	Correct	12 ms	23844 KB	Output is correct
39	Correct	11 ms	23764 KB	Output is correct
40	Correct	11 ms	23752 KB	Output is correct
41	Correct	11 ms	23764 KB	Output is correct
42	Correct	12 ms	23728 KB	Output is correct
43	Correct	11 ms	23804 KB	Output is correct
44	Correct	14 ms	23804 KB	Output is correct
45	Correct	12 ms	23764 KB	Output is correct
46	Correct	12 ms	23892 KB	Output is correct
47	Correct	11 ms	23700 KB	Output is correct
48	Correct	12 ms	23836 KB	Output is correct
49	Correct	15 ms	23892 KB	Output is correct
50	Correct	15 ms	23724 KB	Output is correct
51	Correct	11 ms	23740 KB	Output is correct
52	Correct	11 ms	23816 KB	Output is correct
53	Correct	13 ms	23840 KB	Output is correct
54	Correct	11 ms	23764 KB	Output is correct
55	Correct	11 ms	23832 KB	Output is correct
56	Correct	10 ms	23720 KB	Output is correct
57	Correct	11 ms	23856 KB	Output is correct
58	Correct	11 ms	23888 KB	Output is correct
59	Correct	636 ms	62972 KB	Output is correct
60	Correct	739 ms	67152 KB	Output is correct
61	Correct	11 ms	23804 KB	Output is correct
62	Correct	12 ms	23720 KB	Output is correct
63	Correct	644 ms	58596 KB	Output is correct
64	Correct	17 ms	24548 KB	Output is correct
65	Correct	29 ms	27128 KB	Output is correct
66	Correct	243 ms	51172 KB	Output is correct
67	Correct	986 ms	83868 KB	Output is correct
68	Correct	998 ms	84680 KB	Output is correct
69	Correct	27 ms	25164 KB	Output is correct
70	Correct	146 ms	38280 KB	Output is correct
71	Correct	654 ms	70248 KB	Output is correct
72	Correct	693 ms	69532 KB	Output is correct
73	Correct	149 ms	35436 KB	Output is correct
74	Correct	868 ms	66180 KB	Output is correct
75	Correct	51 ms	28856 KB	Output is correct
76	Correct	631 ms	69904 KB	Output is correct
77	Correct	617 ms	70320 KB	Output is correct
78	Correct	52 ms	29772 KB	Output is correct
79	Correct	895 ms	80992 KB	Output is correct
80	Correct	14 ms	24148 KB	Output is correct
81	Correct	158 ms	38740 KB	Output is correct
82	Correct	672 ms	68220 KB	Output is correct
83	Correct	760 ms	66068 KB	Output is correct
84	Correct	736 ms	66152 KB	Output is correct
85	Correct	752 ms	66268 KB	Output is correct
86	Correct	780 ms	67172 KB	Output is correct
87	Correct	718 ms	67232 KB	Output is correct

답안 #765401

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0