답안 #677199

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
677199	2023-01-02T14:30:30 Z	dooompy	Network (BOI15_net)	C++17	100 / 100	416 ms	48164 KB

#include "bits/stdc++.h"
 
using namespace std;
 
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cout << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    while (l != r) cout << *l << " \n"[++l == r];
}
template <typename A, typename B> istream& operator >> (istream& o, pair<A, B> &a) {
    return o >> a.first >> a.second;
}
template <typename A, typename B> ostream& operator << (ostream& o, pair<A, B> a) {
    return o << '(' << a.first << ", " << a.second << ')';
}
template <typename T> ostream& operator << (ostream& o, vector<T> a) {
    bool is = false;
    for (T i : a) {o << (is ? ' ' : '{'), is = true, o << i;}
    return o << '}';
}
 
#ifdef local
#define test(args...) abc("[" + string(#args) + "]", args)
#else
#define test(args...) void(0)
#endif
 
using ll = long long;
 
vector<int> adj[500005];
bool seen[500005];
vector<int> order;
 
void dfs(int node) {
    seen[node] = true;
    bool leaf = true;
    for (auto nxt : adj[node]) {
        if (seen[nxt]) continue;
        dfs(nxt);
        leaf = false;
    }
    if (leaf) order.push_back(node);
}
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
//    freopen("", "r", stdin);
//    freopen("", "w", stdout);
    int n; cin >> n;
    for (int i = 0; i < n-1; i++) {
        int a, b; cin >>a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
 
    for (int i = 1; i <= n; i++) {
        if (adj[i].size() >= 2) {
            dfs(i);
            break;
        }
    }
 
    int s = order.size();
 
    cout << ceil(s / 2.0) << endl;
 
    for (int i = 0; i < (s + 1) /2; i++) {
        cout << order[i] << " " << order[min(i + s/2, s-1)] << "\n";
    }
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	7 ms	12068 KB	Output is correct
3	Correct	6 ms	12068 KB	Output is correct
4	Correct	6 ms	12064 KB	Output is correct
5	Correct	6 ms	11988 KB	Output is correct
6	Correct	6 ms	11988 KB	Output is correct
7	Correct	6 ms	11988 KB	Output is correct
8	Correct	6 ms	12068 KB	Output is correct
9	Correct	6 ms	11988 KB	Output is correct
10	Correct	7 ms	12044 KB	Output is correct
11	Correct	6 ms	12064 KB	Output is correct
12	Correct	6 ms	11988 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	6 ms	11988 KB	Output is correct
15	Correct	6 ms	11988 KB	Output is correct
16	Correct	7 ms	12132 KB	Output is correct
17	Correct	8 ms	12064 KB	Output is correct
18	Correct	6 ms	12068 KB	Output is correct
19	Correct	6 ms	11988 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	7 ms	12068 KB	Output is correct
3	Correct	6 ms	12068 KB	Output is correct
4	Correct	6 ms	12064 KB	Output is correct
5	Correct	6 ms	11988 KB	Output is correct
6	Correct	6 ms	11988 KB	Output is correct
7	Correct	6 ms	11988 KB	Output is correct
8	Correct	6 ms	12068 KB	Output is correct
9	Correct	6 ms	11988 KB	Output is correct
10	Correct	7 ms	12044 KB	Output is correct
11	Correct	6 ms	12064 KB	Output is correct
12	Correct	6 ms	11988 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	6 ms	11988 KB	Output is correct
15	Correct	6 ms	11988 KB	Output is correct
16	Correct	7 ms	12132 KB	Output is correct
17	Correct	8 ms	12064 KB	Output is correct
18	Correct	6 ms	12068 KB	Output is correct
19	Correct	6 ms	11988 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct
21	Correct	7 ms	11988 KB	Output is correct
22	Correct	7 ms	12116 KB	Output is correct
23	Correct	7 ms	12072 KB	Output is correct
24	Correct	7 ms	12116 KB	Output is correct
25	Correct	7 ms	12116 KB	Output is correct
26	Correct	7 ms	12044 KB	Output is correct
27	Correct	8 ms	12076 KB	Output is correct
28	Correct	7 ms	12080 KB	Output is correct
29	Correct	7 ms	12080 KB	Output is correct
30	Correct	6 ms	11988 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	7 ms	12016 KB	Output is correct
33	Correct	6 ms	11988 KB	Output is correct
34	Correct	6 ms	11988 KB	Output is correct
35	Correct	6 ms	12068 KB	Output is correct
36	Correct	6 ms	11988 KB	Output is correct
37	Correct	8 ms	12076 KB	Output is correct
38	Correct	8 ms	12120 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	7 ms	11980 KB	Output is correct
41	Correct	7 ms	11988 KB	Output is correct
42	Correct	7 ms	12012 KB	Output is correct
43	Correct	6 ms	12068 KB	Output is correct
44	Correct	6 ms	11988 KB	Output is correct
45	Correct	6 ms	11988 KB	Output is correct
46	Correct	7 ms	11988 KB	Output is correct
47	Correct	6 ms	11988 KB	Output is correct
48	Correct	7 ms	12072 KB	Output is correct
49	Correct	7 ms	12116 KB	Output is correct
50	Correct	8 ms	11988 KB	Output is correct
51	Correct	7 ms	11988 KB	Output is correct
52	Correct	8 ms	12072 KB	Output is correct
53	Correct	7 ms	12116 KB	Output is correct
54	Correct	7 ms	11976 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	6 ms	11988 KB	Output is correct
57	Correct	6 ms	12068 KB	Output is correct
58	Correct	7 ms	12116 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	11988 KB	Output is correct
2	Correct	7 ms	12068 KB	Output is correct
3	Correct	6 ms	12068 KB	Output is correct
4	Correct	6 ms	12064 KB	Output is correct
5	Correct	6 ms	11988 KB	Output is correct
6	Correct	6 ms	11988 KB	Output is correct
7	Correct	6 ms	11988 KB	Output is correct
8	Correct	6 ms	12068 KB	Output is correct
9	Correct	6 ms	11988 KB	Output is correct
10	Correct	7 ms	12044 KB	Output is correct
11	Correct	6 ms	12064 KB	Output is correct
12	Correct	6 ms	11988 KB	Output is correct
13	Correct	6 ms	11988 KB	Output is correct
14	Correct	6 ms	11988 KB	Output is correct
15	Correct	6 ms	11988 KB	Output is correct
16	Correct	7 ms	12132 KB	Output is correct
17	Correct	8 ms	12064 KB	Output is correct
18	Correct	6 ms	12068 KB	Output is correct
19	Correct	6 ms	11988 KB	Output is correct
20	Correct	6 ms	11988 KB	Output is correct
21	Correct	7 ms	11988 KB	Output is correct
22	Correct	7 ms	12116 KB	Output is correct
23	Correct	7 ms	12072 KB	Output is correct
24	Correct	7 ms	12116 KB	Output is correct
25	Correct	7 ms	12116 KB	Output is correct
26	Correct	7 ms	12044 KB	Output is correct
27	Correct	8 ms	12076 KB	Output is correct
28	Correct	7 ms	12080 KB	Output is correct
29	Correct	7 ms	12080 KB	Output is correct
30	Correct	6 ms	11988 KB	Output is correct
31	Correct	8 ms	12116 KB	Output is correct
32	Correct	7 ms	12016 KB	Output is correct
33	Correct	6 ms	11988 KB	Output is correct
34	Correct	6 ms	11988 KB	Output is correct
35	Correct	6 ms	12068 KB	Output is correct
36	Correct	6 ms	11988 KB	Output is correct
37	Correct	8 ms	12076 KB	Output is correct
38	Correct	8 ms	12120 KB	Output is correct
39	Correct	7 ms	11988 KB	Output is correct
40	Correct	7 ms	11980 KB	Output is correct
41	Correct	7 ms	11988 KB	Output is correct
42	Correct	7 ms	12012 KB	Output is correct
43	Correct	6 ms	12068 KB	Output is correct
44	Correct	6 ms	11988 KB	Output is correct
45	Correct	6 ms	11988 KB	Output is correct
46	Correct	7 ms	11988 KB	Output is correct
47	Correct	6 ms	11988 KB	Output is correct
48	Correct	7 ms	12072 KB	Output is correct
49	Correct	7 ms	12116 KB	Output is correct
50	Correct	8 ms	11988 KB	Output is correct
51	Correct	7 ms	11988 KB	Output is correct
52	Correct	8 ms	12072 KB	Output is correct
53	Correct	7 ms	12116 KB	Output is correct
54	Correct	7 ms	11976 KB	Output is correct
55	Correct	7 ms	11988 KB	Output is correct
56	Correct	6 ms	11988 KB	Output is correct
57	Correct	6 ms	12068 KB	Output is correct
58	Correct	7 ms	12116 KB	Output is correct
59	Correct	280 ms	36424 KB	Output is correct
60	Correct	332 ms	39248 KB	Output is correct
61	Correct	7 ms	11988 KB	Output is correct
62	Correct	7 ms	11988 KB	Output is correct
63	Correct	239 ms	34004 KB	Output is correct
64	Correct	8 ms	12500 KB	Output is correct
65	Correct	14 ms	13968 KB	Output is correct
66	Correct	112 ms	28088 KB	Output is correct
67	Correct	416 ms	47660 KB	Output is correct
68	Correct	411 ms	48164 KB	Output is correct
69	Correct	12 ms	12884 KB	Output is correct
70	Correct	70 ms	21412 KB	Output is correct
71	Correct	255 ms	42328 KB	Output is correct
72	Correct	278 ms	41144 KB	Output is correct
73	Correct	80 ms	19244 KB	Output is correct
74	Correct	343 ms	38108 KB	Output is correct
75	Correct	24 ms	15296 KB	Output is correct
76	Correct	255 ms	42080 KB	Output is correct
77	Correct	273 ms	42160 KB	Output is correct
78	Correct	27 ms	15564 KB	Output is correct
79	Correct	404 ms	45540 KB	Output is correct
80	Correct	7 ms	12244 KB	Output is correct
81	Correct	84 ms	21404 KB	Output is correct
82	Correct	321 ms	40000 KB	Output is correct
83	Correct	387 ms	38148 KB	Output is correct
84	Correct	351 ms	38112 KB	Output is correct
85	Correct	360 ms	38084 KB	Output is correct
86	Correct	345 ms	39260 KB	Output is correct
87	Correct	365 ms	39272 KB	Output is correct

답안 #677199

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