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Submission #917659

# Submission time Handle Problem Language Result Execution time Memory
917659 2024-01-28T14:13:42 Z VMaksimoski008 Network (BOI15_net) C++14
100 / 100
 637 ms 45664 KB 
#include <bits/stdc++.h>
#define pb push_back
using namespace std;

int n, a, b, i;
vector<int> L, G[500005];

void dfs(int u, int p) {
    for(int &v : G[u]) if(v != p) dfs(v, u);
    if(G[u].size() == 1) L.pb(u);
}

int main() {
    cin >> n;

    for(i=0; i<n-1; i++) {
        cin >> a >> b;
        G[a].pb(b);
        G[b].pb(a);
    }

    dfs(1, 0);

    int sz = L.size();
    cout << (sz+1)/2 << '\n';
    for(i=0; i<sz/2; i++) cout << L[i] << " " << L[i+sz/2] << '\n';
    if(sz & 1) cout << L[0] << " " << L[sz-1] << '\n';
    return 0;
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12124 KB Output is correct
2 Correct 4 ms 12124 KB Output is correct
3 Correct 3 ms 12124 KB Output is correct
4 Correct 4 ms 12124 KB Output is correct
5 Correct 3 ms 12120 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12120 KB Output is correct
8 Correct 4 ms 12148 KB Output is correct
9 Correct 3 ms 12136 KB Output is correct
10 Correct 3 ms 12124 KB Output is correct
11 Correct 3 ms 12124 KB Output is correct
12 Correct 3 ms 12124 KB Output is correct
13 Correct 3 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 4 ms 12124 KB Output is correct
16 Correct 4 ms 12124 KB Output is correct
17 Correct 4 ms 12124 KB Output is correct
18 Correct 3 ms 12136 KB Output is correct
19 Correct 3 ms 12124 KB Output is correct
20 Correct 3 ms 12124 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12124 KB Output is correct
2 Correct 4 ms 12124 KB Output is correct
3 Correct 3 ms 12124 KB Output is correct
4 Correct 4 ms 12124 KB Output is correct
5 Correct 3 ms 12120 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12120 KB Output is correct
8 Correct 4 ms 12148 KB Output is correct
9 Correct 3 ms 12136 KB Output is correct
10 Correct 3 ms 12124 KB Output is correct
11 Correct 3 ms 12124 KB Output is correct
12 Correct 3 ms 12124 KB Output is correct
13 Correct 3 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 4 ms 12124 KB Output is correct
16 Correct 4 ms 12124 KB Output is correct
17 Correct 4 ms 12124 KB Output is correct
18 Correct 3 ms 12136 KB Output is correct
19 Correct 3 ms 12124 KB Output is correct
20 Correct 3 ms 12124 KB Output is correct
21 Correct 4 ms 12124 KB Output is correct
22 Correct 4 ms 12124 KB Output is correct
23 Correct 5 ms 12124 KB Output is correct
24 Correct 4 ms 12124 KB Output is correct
25 Correct 4 ms 12124 KB Output is correct
26 Correct 5 ms 12124 KB Output is correct
27 Correct 4 ms 12124 KB Output is correct
28 Correct 5 ms 12124 KB Output is correct
29 Correct 4 ms 12124 KB Output is correct
30 Correct 3 ms 12124 KB Output is correct
31 Correct 5 ms 12140 KB Output is correct
32 Correct 4 ms 12124 KB Output is correct
33 Correct 4 ms 12124 KB Output is correct
34 Correct 5 ms 12124 KB Output is correct
35 Correct 3 ms 12124 KB Output is correct
36 Correct 4 ms 12124 KB Output is correct
37 Correct 3 ms 12124 KB Output is correct
38 Correct 4 ms 12124 KB Output is correct
39 Correct 4 ms 12376 KB Output is correct
40 Correct 3 ms 12124 KB Output is correct
41 Correct 4 ms 12124 KB Output is correct
42 Correct 4 ms 12124 KB Output is correct
43 Correct 4 ms 12124 KB Output is correct
44 Correct 4 ms 12124 KB Output is correct
45 Correct 5 ms 12124 KB Output is correct
46 Correct 4 ms 12124 KB Output is correct
47 Correct 4 ms 12124 KB Output is correct
48 Correct 4 ms 12120 KB Output is correct
49 Correct 4 ms 12124 KB Output is correct
50 Correct 3 ms 12124 KB Output is correct
51 Correct 3 ms 12124 KB Output is correct
52 Correct 4 ms 12124 KB Output is correct
53 Correct 5 ms 12124 KB Output is correct
54 Correct 3 ms 12144 KB Output is correct
55 Correct 3 ms 12124 KB Output is correct
56 Correct 4 ms 12120 KB Output is correct
57 Correct 3 ms 12124 KB Output is correct
58 Correct 4 ms 12120 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12124 KB Output is correct
2 Correct 4 ms 12124 KB Output is correct
3 Correct 3 ms 12124 KB Output is correct
4 Correct 4 ms 12124 KB Output is correct
5 Correct 3 ms 12120 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12120 KB Output is correct
8 Correct 4 ms 12148 KB Output is correct
9 Correct 3 ms 12136 KB Output is correct
10 Correct 3 ms 12124 KB Output is correct
11 Correct 3 ms 12124 KB Output is correct
12 Correct 3 ms 12124 KB Output is correct
13 Correct 3 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 4 ms 12124 KB Output is correct
16 Correct 4 ms 12124 KB Output is correct
17 Correct 4 ms 12124 KB Output is correct
18 Correct 3 ms 12136 KB Output is correct
19 Correct 3 ms 12124 KB Output is correct
20 Correct 3 ms 12124 KB Output is correct
21 Correct 4 ms 12124 KB Output is correct
22 Correct 4 ms 12124 KB Output is correct
23 Correct 5 ms 12124 KB Output is correct
24 Correct 4 ms 12124 KB Output is correct
25 Correct 4 ms 12124 KB Output is correct
26 Correct 5 ms 12124 KB Output is correct
27 Correct 4 ms 12124 KB Output is correct
28 Correct 5 ms 12124 KB Output is correct
29 Correct 4 ms 12124 KB Output is correct
30 Correct 3 ms 12124 KB Output is correct
31 Correct 5 ms 12140 KB Output is correct
32 Correct 4 ms 12124 KB Output is correct
33 Correct 4 ms 12124 KB Output is correct
34 Correct 5 ms 12124 KB Output is correct
35 Correct 3 ms 12124 KB Output is correct
36 Correct 4 ms 12124 KB Output is correct
37 Correct 3 ms 12124 KB Output is correct
38 Correct 4 ms 12124 KB Output is correct
39 Correct 4 ms 12376 KB Output is correct
40 Correct 3 ms 12124 KB Output is correct
41 Correct 4 ms 12124 KB Output is correct
42 Correct 4 ms 12124 KB Output is correct
43 Correct 4 ms 12124 KB Output is correct
44 Correct 4 ms 12124 KB Output is correct
45 Correct 5 ms 12124 KB Output is correct
46 Correct 4 ms 12124 KB Output is correct
47 Correct 4 ms 12124 KB Output is correct
48 Correct 4 ms 12120 KB Output is correct
49 Correct 4 ms 12124 KB Output is correct
50 Correct 3 ms 12124 KB Output is correct
51 Correct 3 ms 12124 KB Output is correct
52 Correct 4 ms 12124 KB Output is correct
53 Correct 5 ms 12124 KB Output is correct
54 Correct 3 ms 12144 KB Output is correct
55 Correct 3 ms 12124 KB Output is correct
56 Correct 4 ms 12120 KB Output is correct
57 Correct 3 ms 12124 KB Output is correct
58 Correct 4 ms 12120 KB Output is correct
59 Correct 429 ms 29956 KB Output is correct
60 Correct 520 ms 32204 KB Output is correct
61 Correct 4 ms 12124 KB Output is correct
62 Correct 4 ms 12124 KB Output is correct
63 Correct 369 ms 28232 KB Output is correct
64 Correct 8 ms 12632 KB Output is correct
65 Correct 16 ms 13916 KB Output is correct
66 Correct 142 ms 28356 KB Output is correct
67 Correct 618 ms 44792 KB Output is correct
68 Correct 637 ms 45664 KB Output is correct
69 Correct 11 ms 12892 KB Output is correct
70 Correct 108 ms 19244 KB Output is correct
71 Correct 406 ms 35128 KB Output is correct
72 Correct 355 ms 34588 KB Output is correct
73 Correct 84 ms 17572 KB Output is correct
74 Correct 523 ms 31176 KB Output is correct
75 Correct 39 ms 14548 KB Output is correct
76 Correct 385 ms 34740 KB Output is correct
77 Correct 391 ms 35088 KB Output is correct
78 Correct 35 ms 14932 KB Output is correct
79 Correct 636 ms 42104 KB Output is correct
80 Correct 6 ms 12124 KB Output is correct
81 Correct 136 ms 19268 KB Output is correct
82 Correct 526 ms 33056 KB Output is correct
83 Correct 504 ms 30980 KB Output is correct
84 Correct 508 ms 31036 KB Output is correct
85 Correct 504 ms 31336 KB Output is correct
86 Correct 531 ms 32212 KB Output is correct
87 Correct 501 ms 32196 KB Output is correct