oj.uz

답안 #137111

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
137111 2019-07-27T05:34:12 Z silxikys Network (BOI15_net) C++14
100 / 100
 661 ms 55496 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
 
const int maxn = 5e5+5;
int n;
vector<int> adj[maxn];
int deg[maxn];
int tin[maxn];
int pt = 0;
 
vector<int> leafs;
void dfs(int i, int p) {
    tin[i] = pt++;
    if (deg[i] == 1) leafs.push_back(i);
    for (int j: adj[i]) {
        if (j == p) continue;
        dfs(j,i);
    }
}
 
int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin >> n;
    for (int i = 0; i < n - 1; i++) {
        int a, b; cin >> a >> b;
        ++deg[a];
        ++deg[b];
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    int start = 1;
    for (int i = 1; i <= n; i++) {
        if (deg[i] > 1) {
            start = i;
        }
    }
    dfs(start,start);
    int k = leafs.size();
    int m = k/2;
    cout << (k+1)/2 << '\n';
    for (int i = 0; i < (k+1)/2; i++) {
        cout << leafs[i] << ' ' << leafs[(i+m)%k] << '\n';
    }
}

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 13 ms 12024 KB Output is correct
3 Correct 13 ms 12152 KB Output is correct
4 Correct 13 ms 12152 KB Output is correct
5 Correct 13 ms 12144 KB Output is correct
6 Correct 13 ms 12024 KB Output is correct
7 Correct 13 ms 12024 KB Output is correct
8 Correct 13 ms 12024 KB Output is correct
9 Correct 13 ms 12152 KB Output is correct
10 Correct 13 ms 12152 KB Output is correct
11 Correct 13 ms 12152 KB Output is correct
12 Correct 13 ms 12152 KB Output is correct
13 Correct 12 ms 12024 KB Output is correct
14 Correct 13 ms 12024 KB Output is correct
15 Correct 13 ms 12152 KB Output is correct
16 Correct 13 ms 12024 KB Output is correct
17 Correct 13 ms 12152 KB Output is correct
18 Correct 13 ms 12152 KB Output is correct
19 Correct 13 ms 12152 KB Output is correct
20 Correct 13 ms 12152 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 13 ms 12024 KB Output is correct
3 Correct 13 ms 12152 KB Output is correct
4 Correct 13 ms 12152 KB Output is correct
5 Correct 13 ms 12144 KB Output is correct
6 Correct 13 ms 12024 KB Output is correct
7 Correct 13 ms 12024 KB Output is correct
8 Correct 13 ms 12024 KB Output is correct
9 Correct 13 ms 12152 KB Output is correct
10 Correct 13 ms 12152 KB Output is correct
11 Correct 13 ms 12152 KB Output is correct
12 Correct 13 ms 12152 KB Output is correct
13 Correct 12 ms 12024 KB Output is correct
14 Correct 13 ms 12024 KB Output is correct
15 Correct 13 ms 12152 KB Output is correct
16 Correct 13 ms 12024 KB Output is correct
17 Correct 13 ms 12152 KB Output is correct
18 Correct 13 ms 12152 KB Output is correct
19 Correct 13 ms 12152 KB Output is correct
20 Correct 13 ms 12152 KB Output is correct
21 Correct 13 ms 12152 KB Output is correct
22 Correct 15 ms 12280 KB Output is correct
23 Correct 14 ms 12280 KB Output is correct
24 Correct 13 ms 12280 KB Output is correct
25 Correct 13 ms 12152 KB Output is correct
26 Correct 15 ms 12152 KB Output is correct
27 Correct 13 ms 12280 KB Output is correct
28 Correct 14 ms 12152 KB Output is correct
29 Correct 14 ms 12152 KB Output is correct
30 Correct 12 ms 12024 KB Output is correct
31 Correct 14 ms 12280 KB Output is correct
32 Correct 13 ms 12128 KB Output is correct
33 Correct 13 ms 12152 KB Output is correct
34 Correct 13 ms 12152 KB Output is correct
35 Correct 13 ms 12028 KB Output is correct
36 Correct 12 ms 12024 KB Output is correct
37 Correct 13 ms 12156 KB Output is correct
38 Correct 13 ms 12152 KB Output is correct
39 Correct 13 ms 12152 KB Output is correct
40 Correct 13 ms 12152 KB Output is correct
41 Correct 13 ms 12152 KB Output is correct
42 Correct 13 ms 12152 KB Output is correct
43 Correct 13 ms 12152 KB Output is correct
44 Correct 13 ms 12152 KB Output is correct
45 Correct 13 ms 12152 KB Output is correct
46 Correct 13 ms 12152 KB Output is correct
47 Correct 13 ms 12024 KB Output is correct
48 Correct 13 ms 12152 KB Output is correct
49 Correct 16 ms 12156 KB Output is correct
50 Correct 13 ms 12024 KB Output is correct
51 Correct 12 ms 12024 KB Output is correct
52 Correct 13 ms 12160 KB Output is correct
53 Correct 13 ms 12152 KB Output is correct
54 Correct 12 ms 12024 KB Output is correct
55 Correct 13 ms 12152 KB Output is correct
56 Correct 21 ms 12152 KB Output is correct
57 Correct 13 ms 12152 KB Output is correct
58 Correct 14 ms 12280 KB Output is correct

Subtask #3
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 13 ms 12024 KB Output is correct
3 Correct 13 ms 12152 KB Output is correct
4 Correct 13 ms 12152 KB Output is correct
5 Correct 13 ms 12144 KB Output is correct
6 Correct 13 ms 12024 KB Output is correct
7 Correct 13 ms 12024 KB Output is correct
8 Correct 13 ms 12024 KB Output is correct
9 Correct 13 ms 12152 KB Output is correct
10 Correct 13 ms 12152 KB Output is correct
11 Correct 13 ms 12152 KB Output is correct
12 Correct 13 ms 12152 KB Output is correct
13 Correct 12 ms 12024 KB Output is correct
14 Correct 13 ms 12024 KB Output is correct
15 Correct 13 ms 12152 KB Output is correct
16 Correct 13 ms 12024 KB Output is correct
17 Correct 13 ms 12152 KB Output is correct
18 Correct 13 ms 12152 KB Output is correct
19 Correct 13 ms 12152 KB Output is correct
20 Correct 13 ms 12152 KB Output is correct
21 Correct 13 ms 12152 KB Output is correct
22 Correct 15 ms 12280 KB Output is correct
23 Correct 14 ms 12280 KB Output is correct
24 Correct 13 ms 12280 KB Output is correct
25 Correct 13 ms 12152 KB Output is correct
26 Correct 15 ms 12152 KB Output is correct
27 Correct 13 ms 12280 KB Output is correct
28 Correct 14 ms 12152 KB Output is correct
29 Correct 14 ms 12152 KB Output is correct
30 Correct 12 ms 12024 KB Output is correct
31 Correct 14 ms 12280 KB Output is correct
32 Correct 13 ms 12128 KB Output is correct
33 Correct 13 ms 12152 KB Output is correct
34 Correct 13 ms 12152 KB Output is correct
35 Correct 13 ms 12028 KB Output is correct
36 Correct 12 ms 12024 KB Output is correct
37 Correct 13 ms 12156 KB Output is correct
38 Correct 13 ms 12152 KB Output is correct
39 Correct 13 ms 12152 KB Output is correct
40 Correct 13 ms 12152 KB Output is correct
41 Correct 13 ms 12152 KB Output is correct
42 Correct 13 ms 12152 KB Output is correct
43 Correct 13 ms 12152 KB Output is correct
44 Correct 13 ms 12152 KB Output is correct
45 Correct 13 ms 12152 KB Output is correct
46 Correct 13 ms 12152 KB Output is correct
47 Correct 13 ms 12024 KB Output is correct
48 Correct 13 ms 12152 KB Output is correct
49 Correct 16 ms 12156 KB Output is correct
50 Correct 13 ms 12024 KB Output is correct
51 Correct 12 ms 12024 KB Output is correct
52 Correct 13 ms 12160 KB Output is correct
53 Correct 13 ms 12152 KB Output is correct
54 Correct 12 ms 12024 KB Output is correct
55 Correct 13 ms 12152 KB Output is correct
56 Correct 21 ms 12152 KB Output is correct
57 Correct 13 ms 12152 KB Output is correct
58 Correct 14 ms 12280 KB Output is correct
59 Correct 432 ms 33964 KB Output is correct
60 Correct 661 ms 36456 KB Output is correct
61 Correct 13 ms 12024 KB Output is correct
62 Correct 13 ms 12152 KB Output is correct
63 Correct 376 ms 31880 KB Output is correct
64 Correct 15 ms 12536 KB Output is correct
65 Correct 26 ms 13944 KB Output is correct
66 Correct 171 ms 24540 KB Output is correct
67 Correct 651 ms 55496 KB Output is correct
68 Correct 568 ms 48496 KB Output is correct
69 Correct 20 ms 13048 KB Output is correct
70 Correct 119 ms 20716 KB Output is correct
71 Correct 362 ms 39448 KB Output is correct
72 Correct 394 ms 38664 KB Output is correct
73 Correct 116 ms 18548 KB Output is correct
74 Correct 560 ms 35136 KB Output is correct
75 Correct 40 ms 15140 KB Output is correct
76 Correct 373 ms 38880 KB Output is correct
77 Correct 378 ms 39072 KB Output is correct
78 Correct 56 ms 15224 KB Output is correct
79 Correct 627 ms 42412 KB Output is correct
80 Correct 15 ms 12280 KB Output is correct
81 Correct 134 ms 20564 KB Output is correct
82 Correct 439 ms 37008 KB Output is correct
83 Correct 540 ms 35076 KB Output is correct
84 Correct 554 ms 35060 KB Output is correct
85 Correct 570 ms 35108 KB Output is correct
86 Correct 502 ms 36248 KB Output is correct
87 Correct 499 ms 36180 KB Output is correct