oj.uz

Submission #26108

# Submission time Handle Problem Language Result Execution time Memory
26108 2017-06-28T03:29:44 Z bugmenot111 Network (BOI15_net) C++14
100 / 100
 726 ms 43112 KB 
#include <cstdio>
#include <vector>
#define MAXN 500500
std::vector<int> g[MAXN];
int leaves[MAXN], leaves_top;
void dfs(int v, int p) {
	if(g[v].size() == 1) leaves[leaves_top++] = v;
	for(int c: g[v]) if(c != p) dfs(c, v);
}
int main(void) {
	int n;
	scanf("%d", &n);
	for(int i = 1; i < n; i++) {
		int src, dst;
		scanf("%d%d", &src, &dst);
		src--;
		dst--;
        g[src].push_back(dst);
        g[dst].push_back(src);
	}
	dfs(0, -1);
	int nv = (leaves_top + 1) / 2;
	printf("%d\n", nv);
	for(int i = 0; i < nv; i++) {
		int src = leaves[i];
		int dst = leaves[(i + nv) % leaves_top];
		src++;
		dst++;
		printf("%d %d\n", src, dst);
	}
	return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:12:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
net.cpp:15:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &src, &dst);
                            ^

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 14856 KB Output is correct
2 Correct 3 ms 14856 KB Output is correct
3 Correct 3 ms 14856 KB Output is correct
4 Correct 3 ms 14856 KB Output is correct
5 Correct 3 ms 14856 KB Output is correct
6 Correct 0 ms 14856 KB Output is correct
7 Correct 0 ms 14856 KB Output is correct
8 Correct 3 ms 14856 KB Output is correct
9 Correct 3 ms 14856 KB Output is correct
10 Correct 0 ms 14856 KB Output is correct
11 Correct 0 ms 14856 KB Output is correct
12 Correct 0 ms 14856 KB Output is correct
13 Correct 0 ms 14856 KB Output is correct
14 Correct 0 ms 14856 KB Output is correct
15 Correct 3 ms 14856 KB Output is correct
16 Correct 0 ms 14856 KB Output is correct
17 Correct 0 ms 14856 KB Output is correct
18 Correct 0 ms 14856 KB Output is correct
19 Correct 0 ms 14856 KB Output is correct
20 Correct 0 ms 14856 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 14856 KB Output is correct
2 Correct 3 ms 14856 KB Output is correct
3 Correct 3 ms 14856 KB Output is correct
4 Correct 3 ms 14856 KB Output is correct
5 Correct 3 ms 14856 KB Output is correct
6 Correct 0 ms 14856 KB Output is correct
7 Correct 0 ms 14856 KB Output is correct
8 Correct 3 ms 14856 KB Output is correct
9 Correct 3 ms 14856 KB Output is correct
10 Correct 0 ms 14856 KB Output is correct
11 Correct 0 ms 14856 KB Output is correct
12 Correct 0 ms 14856 KB Output is correct
13 Correct 0 ms 14856 KB Output is correct
14 Correct 0 ms 14856 KB Output is correct
15 Correct 3 ms 14856 KB Output is correct
16 Correct 0 ms 14856 KB Output is correct
17 Correct 0 ms 14856 KB Output is correct
18 Correct 0 ms 14856 KB Output is correct
19 Correct 0 ms 14856 KB Output is correct
20 Correct 0 ms 14856 KB Output is correct
21 Correct 0 ms 14856 KB Output is correct
22 Correct 6 ms 14988 KB Output is correct
23 Correct 3 ms 14988 KB Output is correct
24 Correct 0 ms 14988 KB Output is correct
25 Correct 3 ms 14988 KB Output is correct
26 Correct 0 ms 14988 KB Output is correct
27 Correct 6 ms 14988 KB Output is correct
28 Correct 3 ms 14988 KB Output is correct
29 Correct 3 ms 14856 KB Output is correct
30 Correct 0 ms 14856 KB Output is correct
31 Correct 0 ms 14988 KB Output is correct
32 Correct 3 ms 14856 KB Output is correct
33 Correct 3 ms 14856 KB Output is correct
34 Correct 6 ms 14856 KB Output is correct
35 Correct 3 ms 14856 KB Output is correct
36 Correct 0 ms 14856 KB Output is correct
37 Correct 3 ms 14856 KB Output is correct
38 Correct 3 ms 14856 KB Output is correct
39 Correct 0 ms 14856 KB Output is correct
40 Correct 0 ms 14856 KB Output is correct
41 Correct 6 ms 14856 KB Output is correct
42 Correct 0 ms 14856 KB Output is correct
43 Correct 0 ms 14856 KB Output is correct
44 Correct 3 ms 14856 KB Output is correct
45 Correct 6 ms 14856 KB Output is correct
46 Correct 3 ms 14856 KB Output is correct
47 Correct 3 ms 14856 KB Output is correct
48 Correct 3 ms 14856 KB Output is correct
49 Correct 3 ms 14856 KB Output is correct
50 Correct 3 ms 14856 KB Output is correct
51 Correct 3 ms 14856 KB Output is correct
52 Correct 0 ms 14856 KB Output is correct
53 Correct 3 ms 14856 KB Output is correct
54 Correct 3 ms 14856 KB Output is correct
55 Correct 0 ms 14856 KB Output is correct
56 Correct 6 ms 14856 KB Output is correct
57 Correct 3 ms 14856 KB Output is correct
58 Correct 3 ms 14988 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 14856 KB Output is correct
2 Correct 3 ms 14856 KB Output is correct
3 Correct 3 ms 14856 KB Output is correct
4 Correct 3 ms 14856 KB Output is correct
5 Correct 3 ms 14856 KB Output is correct
6 Correct 0 ms 14856 KB Output is correct
7 Correct 0 ms 14856 KB Output is correct
8 Correct 3 ms 14856 KB Output is correct
9 Correct 3 ms 14856 KB Output is correct
10 Correct 0 ms 14856 KB Output is correct
11 Correct 0 ms 14856 KB Output is correct
12 Correct 0 ms 14856 KB Output is correct
13 Correct 0 ms 14856 KB Output is correct
14 Correct 0 ms 14856 KB Output is correct
15 Correct 3 ms 14856 KB Output is correct
16 Correct 0 ms 14856 KB Output is correct
17 Correct 0 ms 14856 KB Output is correct
18 Correct 0 ms 14856 KB Output is correct
19 Correct 0 ms 14856 KB Output is correct
20 Correct 0 ms 14856 KB Output is correct
21 Correct 0 ms 14856 KB Output is correct
22 Correct 6 ms 14988 KB Output is correct
23 Correct 3 ms 14988 KB Output is correct
24 Correct 0 ms 14988 KB Output is correct
25 Correct 3 ms 14988 KB Output is correct
26 Correct 0 ms 14988 KB Output is correct
27 Correct 6 ms 14988 KB Output is correct
28 Correct 3 ms 14988 KB Output is correct
29 Correct 3 ms 14856 KB Output is correct
30 Correct 0 ms 14856 KB Output is correct
31 Correct 0 ms 14988 KB Output is correct
32 Correct 3 ms 14856 KB Output is correct
33 Correct 3 ms 14856 KB Output is correct
34 Correct 6 ms 14856 KB Output is correct
35 Correct 3 ms 14856 KB Output is correct
36 Correct 0 ms 14856 KB Output is correct
37 Correct 3 ms 14856 KB Output is correct
38 Correct 3 ms 14856 KB Output is correct
39 Correct 0 ms 14856 KB Output is correct
40 Correct 0 ms 14856 KB Output is correct
41 Correct 6 ms 14856 KB Output is correct
42 Correct 0 ms 14856 KB Output is correct
43 Correct 0 ms 14856 KB Output is correct
44 Correct 3 ms 14856 KB Output is correct
45 Correct 6 ms 14856 KB Output is correct
46 Correct 3 ms 14856 KB Output is correct
47 Correct 3 ms 14856 KB Output is correct
48 Correct 3 ms 14856 KB Output is correct
49 Correct 3 ms 14856 KB Output is correct
50 Correct 3 ms 14856 KB Output is correct
51 Correct 3 ms 14856 KB Output is correct
52 Correct 0 ms 14856 KB Output is correct
53 Correct 3 ms 14856 KB Output is correct
54 Correct 3 ms 14856 KB Output is correct
55 Correct 0 ms 14856 KB Output is correct
56 Correct 6 ms 14856 KB Output is correct
57 Correct 3 ms 14856 KB Output is correct
58 Correct 3 ms 14988 KB Output is correct
59 Correct 456 ms 30008 KB Output is correct
60 Correct 609 ms 31224 KB Output is correct
61 Correct 0 ms 14856 KB Output is correct
62 Correct 0 ms 14856 KB Output is correct
63 Correct 403 ms 27924 KB Output is correct
64 Correct 3 ms 15092 KB Output is correct
65 Correct 13 ms 16376 KB Output is correct
66 Correct 226 ms 28372 KB Output is correct
67 Correct 713 ms 42872 KB Output is correct
68 Correct 653 ms 43112 KB Output is correct
69 Correct 9 ms 15424 KB Output is correct
70 Correct 123 ms 21176 KB Output is correct
71 Correct 399 ms 32516 KB Output is correct
72 Correct 373 ms 32504 KB Output is correct
73 Correct 143 ms 19344 KB Output is correct
74 Correct 679 ms 31092 KB Output is correct
75 Correct 36 ms 16896 KB Output is correct
76 Correct 429 ms 32524 KB Output is correct
77 Correct 479 ms 32544 KB Output is correct
78 Correct 33 ms 17200 KB Output is correct
79 Correct 726 ms 41128 KB Output is correct
80 Correct 3 ms 14988 KB Output is correct
81 Correct 153 ms 20784 KB Output is correct
82 Correct 526 ms 31860 KB Output is correct
83 Correct 629 ms 31092 KB Output is correct
84 Correct 659 ms 31092 KB Output is correct
85 Correct 653 ms 31092 KB Output is correct
86 Correct 449 ms 31224 KB Output is correct
87 Correct 643 ms 31224 KB Output is correct