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Submission #51032

# Submission time Handle Problem Language Result Execution time Memory
51032 2018-06-15T16:31:33 Z SpaimaCarpatilor Network (BOI15_net) C++17
100 / 100
 687 ms 153292 KB 
#include<cstdio>
#include<vector>

using namespace std;

int N, nr, rad, cod[500009];
vector < int > v[500009];

void dfs (int nod, int tata)
{
    if (v[nod].size () == 1) cod[++nr] = nod;
    for (vector < int > :: iterator it = v[nod].begin (); it != v[nod].end (); it ++)
        if (*it != tata)
            dfs (*it, nod);
}

int main ()
{
//freopen ("input", "r", stdin);
//freopen ("output", "w", stdout);

scanf ("%d", &N);
for (int i=1; i<N; i++)
{
    int x, y;
    scanf ("%d %d", &x, &y);
    v[x].push_back (y), v[y].push_back (x);
}

for (int i=1; i<=N; i++)
    if (v[i].size () >= 2) rad = i;
dfs (rad, -1);

printf ("%d\n", nr / 2 + nr % 2);
for (int i=1; i + nr / 2 <= nr; i++)
    printf ("%d %d\n", cod[i], cod[i + nr / 2]);

return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf ("%d", &N);
 ~~~~~~^~~~~~~~~~
net.cpp:26:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%d %d", &x, &y);
     ~~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 12 ms 12144 KB Output is correct
3 Correct 11 ms 12144 KB Output is correct
4 Correct 15 ms 12192 KB Output is correct
5 Correct 15 ms 12240 KB Output is correct
6 Correct 13 ms 12424 KB Output is correct
7 Correct 12 ms 12424 KB Output is correct
8 Correct 11 ms 12424 KB Output is correct
9 Correct 12 ms 12424 KB Output is correct
10 Correct 11 ms 12480 KB Output is correct
11 Correct 12 ms 12480 KB Output is correct
12 Correct 12 ms 12480 KB Output is correct
13 Correct 12 ms 12480 KB Output is correct
14 Correct 12 ms 12480 KB Output is correct
15 Correct 11 ms 12480 KB Output is correct
16 Correct 11 ms 12480 KB Output is correct
17 Correct 11 ms 12480 KB Output is correct
18 Correct 12 ms 12480 KB Output is correct
19 Correct 11 ms 12480 KB Output is correct
20 Correct 12 ms 12480 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 12 ms 12144 KB Output is correct
3 Correct 11 ms 12144 KB Output is correct
4 Correct 15 ms 12192 KB Output is correct
5 Correct 15 ms 12240 KB Output is correct
6 Correct 13 ms 12424 KB Output is correct
7 Correct 12 ms 12424 KB Output is correct
8 Correct 11 ms 12424 KB Output is correct
9 Correct 12 ms 12424 KB Output is correct
10 Correct 11 ms 12480 KB Output is correct
11 Correct 12 ms 12480 KB Output is correct
12 Correct 12 ms 12480 KB Output is correct
13 Correct 12 ms 12480 KB Output is correct
14 Correct 12 ms 12480 KB Output is correct
15 Correct 11 ms 12480 KB Output is correct
16 Correct 11 ms 12480 KB Output is correct
17 Correct 11 ms 12480 KB Output is correct
18 Correct 12 ms 12480 KB Output is correct
19 Correct 11 ms 12480 KB Output is correct
20 Correct 12 ms 12480 KB Output is correct
21 Correct 11 ms 12480 KB Output is correct
22 Correct 13 ms 12580 KB Output is correct
23 Correct 13 ms 12580 KB Output is correct
24 Correct 12 ms 12592 KB Output is correct
25 Correct 13 ms 12612 KB Output is correct
26 Correct 12 ms 12644 KB Output is correct
27 Correct 13 ms 12656 KB Output is correct
28 Correct 13 ms 12676 KB Output is correct
29 Correct 12 ms 12696 KB Output is correct
30 Correct 12 ms 12696 KB Output is correct
31 Correct 13 ms 12716 KB Output is correct
32 Correct 13 ms 12716 KB Output is correct
33 Correct 12 ms 12716 KB Output is correct
34 Correct 12 ms 12716 KB Output is correct
35 Correct 12 ms 12716 KB Output is correct
36 Correct 13 ms 12716 KB Output is correct
37 Correct 12 ms 12716 KB Output is correct
38 Correct 12 ms 12784 KB Output is correct
39 Correct 12 ms 12784 KB Output is correct
40 Correct 12 ms 12808 KB Output is correct
41 Correct 12 ms 12808 KB Output is correct
42 Correct 11 ms 12808 KB Output is correct
43 Correct 12 ms 12864 KB Output is correct
44 Correct 12 ms 12864 KB Output is correct
45 Correct 12 ms 12864 KB Output is correct
46 Correct 12 ms 12864 KB Output is correct
47 Correct 12 ms 12888 KB Output is correct
48 Correct 12 ms 12888 KB Output is correct
49 Correct 12 ms 12928 KB Output is correct
50 Correct 12 ms 12928 KB Output is correct
51 Correct 12 ms 12928 KB Output is correct
52 Correct 12 ms 12928 KB Output is correct
53 Correct 12 ms 12952 KB Output is correct
54 Correct 12 ms 12952 KB Output is correct
55 Correct 12 ms 12952 KB Output is correct
56 Correct 11 ms 12952 KB Output is correct
57 Correct 12 ms 12952 KB Output is correct
58 Correct 12 ms 12976 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 12 ms 12144 KB Output is correct
3 Correct 11 ms 12144 KB Output is correct
4 Correct 15 ms 12192 KB Output is correct
5 Correct 15 ms 12240 KB Output is correct
6 Correct 13 ms 12424 KB Output is correct
7 Correct 12 ms 12424 KB Output is correct
8 Correct 11 ms 12424 KB Output is correct
9 Correct 12 ms 12424 KB Output is correct
10 Correct 11 ms 12480 KB Output is correct
11 Correct 12 ms 12480 KB Output is correct
12 Correct 12 ms 12480 KB Output is correct
13 Correct 12 ms 12480 KB Output is correct
14 Correct 12 ms 12480 KB Output is correct
15 Correct 11 ms 12480 KB Output is correct
16 Correct 11 ms 12480 KB Output is correct
17 Correct 11 ms 12480 KB Output is correct
18 Correct 12 ms 12480 KB Output is correct
19 Correct 11 ms 12480 KB Output is correct
20 Correct 12 ms 12480 KB Output is correct
21 Correct 11 ms 12480 KB Output is correct
22 Correct 13 ms 12580 KB Output is correct
23 Correct 13 ms 12580 KB Output is correct
24 Correct 12 ms 12592 KB Output is correct
25 Correct 13 ms 12612 KB Output is correct
26 Correct 12 ms 12644 KB Output is correct
27 Correct 13 ms 12656 KB Output is correct
28 Correct 13 ms 12676 KB Output is correct
29 Correct 12 ms 12696 KB Output is correct
30 Correct 12 ms 12696 KB Output is correct
31 Correct 13 ms 12716 KB Output is correct
32 Correct 13 ms 12716 KB Output is correct
33 Correct 12 ms 12716 KB Output is correct
34 Correct 12 ms 12716 KB Output is correct
35 Correct 12 ms 12716 KB Output is correct
36 Correct 13 ms 12716 KB Output is correct
37 Correct 12 ms 12716 KB Output is correct
38 Correct 12 ms 12784 KB Output is correct
39 Correct 12 ms 12784 KB Output is correct
40 Correct 12 ms 12808 KB Output is correct
41 Correct 12 ms 12808 KB Output is correct
42 Correct 11 ms 12808 KB Output is correct
43 Correct 12 ms 12864 KB Output is correct
44 Correct 12 ms 12864 KB Output is correct
45 Correct 12 ms 12864 KB Output is correct
46 Correct 12 ms 12864 KB Output is correct
47 Correct 12 ms 12888 KB Output is correct
48 Correct 12 ms 12888 KB Output is correct
49 Correct 12 ms 12928 KB Output is correct
50 Correct 12 ms 12928 KB Output is correct
51 Correct 12 ms 12928 KB Output is correct
52 Correct 12 ms 12928 KB Output is correct
53 Correct 12 ms 12952 KB Output is correct
54 Correct 12 ms 12952 KB Output is correct
55 Correct 12 ms 12952 KB Output is correct
56 Correct 11 ms 12952 KB Output is correct
57 Correct 12 ms 12952 KB Output is correct
58 Correct 12 ms 12976 KB Output is correct
59 Correct 426 ms 36832 KB Output is correct
60 Correct 538 ms 45588 KB Output is correct
61 Correct 12 ms 45588 KB Output is correct
62 Correct 13 ms 45588 KB Output is correct
63 Correct 367 ms 46836 KB Output is correct
64 Correct 15 ms 46836 KB Output is correct
65 Correct 25 ms 46836 KB Output is correct
66 Correct 190 ms 46836 KB Output is correct
67 Correct 634 ms 79160 KB Output is correct
68 Correct 613 ms 79160 KB Output is correct
69 Correct 19 ms 79160 KB Output is correct
70 Correct 111 ms 79160 KB Output is correct
71 Correct 379 ms 79160 KB Output is correct
72 Correct 385 ms 84216 KB Output is correct
73 Correct 128 ms 84216 KB Output is correct
74 Correct 540 ms 89044 KB Output is correct
75 Correct 45 ms 89044 KB Output is correct
76 Correct 375 ms 100248 KB Output is correct
77 Correct 372 ms 107112 KB Output is correct
78 Correct 50 ms 107112 KB Output is correct
79 Correct 620 ms 117888 KB Output is correct
80 Correct 17 ms 117888 KB Output is correct
81 Correct 142 ms 117888 KB Output is correct
82 Correct 481 ms 120844 KB Output is correct
83 Correct 573 ms 125428 KB Output is correct
84 Correct 611 ms 132272 KB Output is correct
85 Correct 687 ms 138876 KB Output is correct
86 Correct 600 ms 146488 KB Output is correct
87 Correct 594 ms 153292 KB Output is correct