답안 #583427

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
583427	2022-06-25T10:48:38 Z	TheLimePixel	Network (BOI15_net)	C++17	100 / 100	494 ms	40916 KB

#include "bits/stdc++.h"

using namespace std;

vector<vector<int>> graph;
vector<int> leaves; // indeksite na posetenite listovi
int leaf_count, res_count;  // brojot na listovi i brojot na potrebni vrski

// Rekurentno se dodavaat listovite so DFS
void add_leaves(int node, int parent) {
    if (graph[node].size() == 1)
        leaves.push_back(node);

    for (auto adj : graph[node])
        if (adj != parent)
            add_leaves(adj, node);
}

// Glavnata funkcija
void run() {
    int n;
    cin >> n;

    // Se spravuvame so posebni sluchai

    if (n == 1) {
        cout << 0;
        return;
    }

    if (n == 2) {
        cout << "1\n2";
        return;
    }

    // Go inicijalizirame drvoto

    graph = vector<vector<int>>(n + 1);

    for (int i = 0; i < n - 1; i++) {
        int a, b;
        cin >> a >> b;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }

    // Go broime brojot na listovi i go presmetuvame brojot na potrebni vrski

    for (int i = 1; i <= n; i++)
        if (graph[i].size() == 1)
            leaf_count++;

    res_count = (leaf_count + 1) / 2;
    cout << res_count;
    leaves.reserve(2 * res_count);

    // Gi dodavame listovite

    add_leaves(1, 0);

    if (leaf_count & 1)
        leaves.push_back(leaves.front());

    // Gi pechatime soodvetnite parovi

    for (int i = 0; i < res_count; i++)
        cout << '\n' << leaves[i] << ' ' << leaves[res_count + i];
}

// Main funkcija
auto main() -> int {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    run();
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	1 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	1 ms	212 KB	Output is correct
18	Correct	1 ms	212 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	0 ms	212 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	1 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	1 ms	212 KB	Output is correct
18	Correct	1 ms	212 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	0 ms	212 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	340 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	468 KB	Output is correct
25	Correct	1 ms	340 KB	Output is correct
26	Correct	1 ms	340 KB	Output is correct
27	Correct	1 ms	340 KB	Output is correct
28	Correct	2 ms	340 KB	Output is correct
29	Correct	1 ms	340 KB	Output is correct
30	Correct	1 ms	212 KB	Output is correct
31	Correct	1 ms	340 KB	Output is correct
32	Correct	1 ms	212 KB	Output is correct
33	Correct	0 ms	212 KB	Output is correct
34	Correct	1 ms	212 KB	Output is correct
35	Correct	0 ms	212 KB	Output is correct
36	Correct	0 ms	212 KB	Output is correct
37	Correct	1 ms	340 KB	Output is correct
38	Correct	1 ms	340 KB	Output is correct
39	Correct	1 ms	212 KB	Output is correct
40	Correct	0 ms	212 KB	Output is correct
41	Correct	1 ms	212 KB	Output is correct
42	Correct	1 ms	340 KB	Output is correct
43	Correct	1 ms	340 KB	Output is correct
44	Correct	1 ms	212 KB	Output is correct
45	Correct	1 ms	340 KB	Output is correct
46	Correct	1 ms	340 KB	Output is correct
47	Correct	1 ms	212 KB	Output is correct
48	Correct	1 ms	340 KB	Output is correct
49	Correct	1 ms	340 KB	Output is correct
50	Correct	0 ms	212 KB	Output is correct
51	Correct	0 ms	212 KB	Output is correct
52	Correct	1 ms	340 KB	Output is correct
53	Correct	1 ms	340 KB	Output is correct
54	Correct	0 ms	212 KB	Output is correct
55	Correct	1 ms	340 KB	Output is correct
56	Correct	1 ms	212 KB	Output is correct
57	Correct	1 ms	340 KB	Output is correct
58	Correct	1 ms	340 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	1 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	1 ms	212 KB	Output is correct
18	Correct	1 ms	212 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	0 ms	212 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	1 ms	340 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	468 KB	Output is correct
25	Correct	1 ms	340 KB	Output is correct
26	Correct	1 ms	340 KB	Output is correct
27	Correct	1 ms	340 KB	Output is correct
28	Correct	2 ms	340 KB	Output is correct
29	Correct	1 ms	340 KB	Output is correct
30	Correct	1 ms	212 KB	Output is correct
31	Correct	1 ms	340 KB	Output is correct
32	Correct	1 ms	212 KB	Output is correct
33	Correct	0 ms	212 KB	Output is correct
34	Correct	1 ms	212 KB	Output is correct
35	Correct	0 ms	212 KB	Output is correct
36	Correct	0 ms	212 KB	Output is correct
37	Correct	1 ms	340 KB	Output is correct
38	Correct	1 ms	340 KB	Output is correct
39	Correct	1 ms	212 KB	Output is correct
40	Correct	0 ms	212 KB	Output is correct
41	Correct	1 ms	212 KB	Output is correct
42	Correct	1 ms	340 KB	Output is correct
43	Correct	1 ms	340 KB	Output is correct
44	Correct	1 ms	212 KB	Output is correct
45	Correct	1 ms	340 KB	Output is correct
46	Correct	1 ms	340 KB	Output is correct
47	Correct	1 ms	212 KB	Output is correct
48	Correct	1 ms	340 KB	Output is correct
49	Correct	1 ms	340 KB	Output is correct
50	Correct	0 ms	212 KB	Output is correct
51	Correct	0 ms	212 KB	Output is correct
52	Correct	1 ms	340 KB	Output is correct
53	Correct	1 ms	340 KB	Output is correct
54	Correct	0 ms	212 KB	Output is correct
55	Correct	1 ms	340 KB	Output is correct
56	Correct	1 ms	212 KB	Output is correct
57	Correct	1 ms	340 KB	Output is correct
58	Correct	1 ms	340 KB	Output is correct
59	Correct	330 ms	28772 KB	Output is correct
60	Correct	468 ms	31948 KB	Output is correct
61	Correct	1 ms	212 KB	Output is correct
62	Correct	1 ms	212 KB	Output is correct
63	Correct	322 ms	25816 KB	Output is correct
64	Correct	2 ms	724 KB	Output is correct
65	Correct	13 ms	2516 KB	Output is correct
66	Correct	152 ms	18096 KB	Output is correct
67	Correct	435 ms	40380 KB	Output is correct
68	Correct	494 ms	40916 KB	Output is correct
69	Correct	6 ms	1236 KB	Output is correct
70	Correct	86 ms	10976 KB	Output is correct
71	Correct	263 ms	34948 KB	Output is correct
72	Correct	279 ms	34344 KB	Output is correct
73	Correct	73 ms	8760 KB	Output is correct
74	Correct	440 ms	30828 KB	Output is correct
75	Correct	22 ms	4052 KB	Output is correct
76	Correct	271 ms	34704 KB	Output is correct
77	Correct	282 ms	34964 KB	Output is correct
78	Correct	28 ms	4180 KB	Output is correct
79	Correct	473 ms	38552 KB	Output is correct
80	Correct	2 ms	468 KB	Output is correct
81	Correct	99 ms	11308 KB	Output is correct
82	Correct	326 ms	32872 KB	Output is correct
83	Correct	381 ms	30924 KB	Output is correct
84	Correct	385 ms	30824 KB	Output is correct
85	Correct	376 ms	30848 KB	Output is correct
86	Correct	369 ms	31968 KB	Output is correct
87	Correct	420 ms	31952 KB	Output is correct

답안 #583427

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