| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 544720 |
2022-04-02T16:10:00 Z |
rainboy |
Network (BOI15_net) |
C |
|
359 ms |
45840 KB |
#include <stdio.h>
#include <stdlib.h>
#define N 500000
int *ej[N], eo[N];
void append(int i, int j) {
int o = eo[i]++;
if (o >= 2 && (o & o - 1) == 0)
ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
ej[i][o] = j;
}
int qu[N], cnt;
void dfs(int p, int i) {
int o;
if (eo[i] == 1)
qu[cnt++] = i;
for (o = 0; o < eo[i]; o++) {
int j = ej[i][o];
if (j != p)
dfs(i, j);
}
}
int main() {
int n, h, i, j;
scanf("%d", &n);
for (i = 0; i < n; i++)
ej[i] = (int *) malloc(2 * sizeof *ej[i]);
for (h = 0; h < n - 1; h++) {
scanf("%d%d", &i, &j), i--, j--;
append(i, j), append(j, i);
}
i = 0;
while (eo[i] == 1)
i++;
dfs(-1, i);
printf("%d\n", (cnt + 1) / 2);
for (h = 0; h < (cnt + 1) / 2; h++)
printf("%d %d\n", qu[h] + 1, qu[h + cnt / 2] + 1);
return 0;
}
Compilation message
net.c: In function 'append':
net.c:11:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
11 | if (o >= 2 && (o & o - 1) == 0)
| ~~^~~
net.c: In function 'main':
net.c:34:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | scanf("%d", &n);
| ^~~~~~~~~~~~~~~
net.c:38:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
38 | scanf("%d%d", &i, &j), i--, j--;
| ^~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 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 |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
296 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
0 ms |
276 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
296 KB |
Output is correct |
| 20 |
Correct |
0 ms |
292 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 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 |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
296 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
0 ms |
276 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
296 KB |
Output is correct |
| 20 |
Correct |
0 ms |
292 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 |
432 KB |
Output is correct |
| 25 |
Correct |
1 ms |
340 KB |
Output is correct |
| 26 |
Correct |
1 ms |
300 KB |
Output is correct |
| 27 |
Correct |
1 ms |
436 KB |
Output is correct |
| 28 |
Correct |
1 ms |
428 KB |
Output is correct |
| 29 |
Correct |
1 ms |
340 KB |
Output is correct |
| 30 |
Correct |
0 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
340 KB |
Output is correct |
| 32 |
Correct |
0 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
0 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 |
0 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 |
0 ms |
212 KB |
Output is correct |
| 45 |
Correct |
0 ms |
212 KB |
Output is correct |
| 46 |
Correct |
1 ms |
292 KB |
Output is correct |
| 47 |
Correct |
0 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
292 KB |
Output is correct |
| 49 |
Correct |
1 ms |
296 KB |
Output is correct |
| 50 |
Correct |
0 ms |
292 KB |
Output is correct |
| 51 |
Correct |
0 ms |
300 KB |
Output is correct |
| 52 |
Correct |
1 ms |
212 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
0 ms |
212 KB |
Output is correct |
| 55 |
Correct |
0 ms |
212 KB |
Output is correct |
| 56 |
Correct |
0 ms |
292 KB |
Output is correct |
| 57 |
Correct |
1 ms |
340 KB |
Output is correct |
| 58 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 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 |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
296 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
0 ms |
276 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
296 KB |
Output is correct |
| 20 |
Correct |
0 ms |
292 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 |
432 KB |
Output is correct |
| 25 |
Correct |
1 ms |
340 KB |
Output is correct |
| 26 |
Correct |
1 ms |
300 KB |
Output is correct |
| 27 |
Correct |
1 ms |
436 KB |
Output is correct |
| 28 |
Correct |
1 ms |
428 KB |
Output is correct |
| 29 |
Correct |
1 ms |
340 KB |
Output is correct |
| 30 |
Correct |
0 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
340 KB |
Output is correct |
| 32 |
Correct |
0 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
0 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 |
0 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 |
0 ms |
212 KB |
Output is correct |
| 45 |
Correct |
0 ms |
212 KB |
Output is correct |
| 46 |
Correct |
1 ms |
292 KB |
Output is correct |
| 47 |
Correct |
0 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
292 KB |
Output is correct |
| 49 |
Correct |
1 ms |
296 KB |
Output is correct |
| 50 |
Correct |
0 ms |
292 KB |
Output is correct |
| 51 |
Correct |
0 ms |
300 KB |
Output is correct |
| 52 |
Correct |
1 ms |
212 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
0 ms |
212 KB |
Output is correct |
| 55 |
Correct |
0 ms |
212 KB |
Output is correct |
| 56 |
Correct |
0 ms |
292 KB |
Output is correct |
| 57 |
Correct |
1 ms |
340 KB |
Output is correct |
| 58 |
Correct |
1 ms |
340 KB |
Output is correct |
| 59 |
Correct |
270 ms |
29540 KB |
Output is correct |
| 60 |
Correct |
354 ms |
33932 KB |
Output is correct |
| 61 |
Correct |
0 ms |
212 KB |
Output is correct |
| 62 |
Correct |
0 ms |
300 KB |
Output is correct |
| 63 |
Correct |
238 ms |
26572 KB |
Output is correct |
| 64 |
Correct |
2 ms |
816 KB |
Output is correct |
| 65 |
Correct |
9 ms |
2644 KB |
Output is correct |
| 66 |
Correct |
101 ms |
20944 KB |
Output is correct |
| 67 |
Correct |
353 ms |
45132 KB |
Output is correct |
| 68 |
Correct |
359 ms |
45840 KB |
Output is correct |
| 69 |
Correct |
6 ms |
1236 KB |
Output is correct |
| 70 |
Correct |
69 ms |
11360 KB |
Output is correct |
| 71 |
Correct |
271 ms |
36012 KB |
Output is correct |
| 72 |
Correct |
277 ms |
34636 KB |
Output is correct |
| 73 |
Correct |
60 ms |
8980 KB |
Output is correct |
| 74 |
Correct |
333 ms |
32592 KB |
Output is correct |
| 75 |
Correct |
20 ms |
4300 KB |
Output is correct |
| 76 |
Correct |
271 ms |
35820 KB |
Output is correct |
| 77 |
Correct |
283 ms |
35676 KB |
Output is correct |
| 78 |
Correct |
22 ms |
4736 KB |
Output is correct |
| 79 |
Correct |
353 ms |
42784 KB |
Output is correct |
| 80 |
Correct |
2 ms |
468 KB |
Output is correct |
| 81 |
Correct |
77 ms |
11572 KB |
Output is correct |
| 82 |
Correct |
302 ms |
33976 KB |
Output is correct |
| 83 |
Correct |
318 ms |
32540 KB |
Output is correct |
| 84 |
Correct |
317 ms |
32548 KB |
Output is correct |
| 85 |
Correct |
323 ms |
32580 KB |
Output is correct |
| 86 |
Correct |
329 ms |
33936 KB |
Output is correct |
| 87 |
Correct |
348 ms |
33976 KB |
Output is correct |
