| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 545884 |
2022-04-05T15:53:01 Z |
rainboy |
007 (CEOI14_007) |
C |
|
306 ms |
23228 KB |
#include <stdio.h>
#include <stdlib.h>
#define N 200000
int min(int a, int b) { return a < b ? a : b; }
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;
}
void bfs(int *dd, int n, int s) {
static int qu[N];
int i, head, cnt;
for (i = 0; i < n; i++)
dd[i] = n;
head = cnt = 0;
dd[s] = 0, qu[head + cnt++] = s;
while (cnt) {
int d, o;
i = qu[cnt--, head++], d = dd[i] + 1;
for (o = eo[i]; o--; ) {
int j = ej[i][o];
if (dd[j] > d)
dd[j] = d, qu[head + cnt++] = j;
}
}
}
int dda[N], ddb[N], dd_[N]; char visited[N];
void dfs(int i) {
int o;
if (visited[i])
return;
dd_[i] = dda[i], visited[i] = 1;
for (o = eo[i]; o--; ) {
int j = ej[i][o];
if (dda[j] == dda[i] - 1 && ddb[j] == ddb[i] - 1) {
dfs(j);
dd_[i] = min(dd_[i], dd_[j]);
}
}
}
int main() {
int n, m, s, t, a, b, i, j, d;
scanf("%d%d%d%d%d%d", &n, &m, &s, &t, &a, &b), s--, t--, a--, b--;
for (i = 0; i < n; i++)
ej[i] = (int *) malloc(2 * sizeof *ej[i]);
while (m--) {
scanf("%d%d", &i, &j), i--, j--;
append(i, j), append(j, i);
}
bfs(dda, n, a);
bfs(ddb, n, b);
d = dda[s] > dda[t] || ddb[s] > ddb[t] ? -1 : min(dda[t] - dda[s], ddb[t] - ddb[s]);
if (d != -1 && dda[s] == ddb[s] && dda[t] == ddb[t]) {
dfs(s), dfs(t);
if (dd_[s] > dd_[t])
d--;
}
printf("%d\n", d);
return 0;
}
Compilation message
007.c: In function 'append':
007.c:13:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
13 | if (o >= 2 && (o & o - 1) == 0)
| ~~^~~
007.c: In function 'main':
007.c:60:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
60 | scanf("%d%d%d%d%d%d", &n, &m, &s, &t, &a, &b), s--, t--, a--, b--;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
007.c:64:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
64 | 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 |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 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 |
0 ms |
288 KB |
Output is correct |
| 9 |
Correct |
1 ms |
292 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
292 KB |
Output is correct |
| 13 |
Correct |
1 ms |
292 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
300 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
340 KB |
Output is correct |
| 23 |
Correct |
1 ms |
300 KB |
Output is correct |
| 24 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
17 ms |
3168 KB |
Output is correct |
| 2 |
Correct |
25 ms |
4760 KB |
Output is correct |
| 3 |
Correct |
22 ms |
3300 KB |
Output is correct |
| 4 |
Correct |
24 ms |
4880 KB |
Output is correct |
| 5 |
Correct |
16 ms |
2848 KB |
Output is correct |
| 6 |
Correct |
19 ms |
3244 KB |
Output is correct |
| 7 |
Correct |
18 ms |
3540 KB |
Output is correct |
| 8 |
Correct |
20 ms |
3628 KB |
Output is correct |
| 9 |
Correct |
31 ms |
4608 KB |
Output is correct |
| 10 |
Correct |
150 ms |
13708 KB |
Output is correct |
| 11 |
Correct |
39 ms |
6808 KB |
Output is correct |
| 12 |
Correct |
55 ms |
8500 KB |
Output is correct |
| 13 |
Correct |
52 ms |
7288 KB |
Output is correct |
| 14 |
Correct |
42 ms |
5744 KB |
Output is correct |
| 15 |
Correct |
64 ms |
8720 KB |
Output is correct |
| 16 |
Correct |
77 ms |
8604 KB |
Output is correct |
| 17 |
Correct |
74 ms |
7536 KB |
Output is correct |
| 18 |
Correct |
69 ms |
7788 KB |
Output is correct |
| 19 |
Correct |
100 ms |
10684 KB |
Output is correct |
| 20 |
Correct |
173 ms |
17064 KB |
Output is correct |
| 21 |
Correct |
99 ms |
12568 KB |
Output is correct |
| 22 |
Correct |
73 ms |
10220 KB |
Output is correct |
| 23 |
Correct |
85 ms |
10924 KB |
Output is correct |
| 24 |
Correct |
79 ms |
12028 KB |
Output is correct |
| 25 |
Correct |
92 ms |
11024 KB |
Output is correct |
| 26 |
Correct |
94 ms |
9652 KB |
Output is correct |
| 27 |
Correct |
115 ms |
11000 KB |
Output is correct |
| 28 |
Correct |
120 ms |
11268 KB |
Output is correct |
| 29 |
Correct |
154 ms |
13572 KB |
Output is correct |
| 30 |
Correct |
248 ms |
18324 KB |
Output is correct |
| 31 |
Correct |
158 ms |
14512 KB |
Output is correct |
| 32 |
Correct |
122 ms |
11688 KB |
Output is correct |
| 33 |
Correct |
131 ms |
11288 KB |
Output is correct |
| 34 |
Correct |
131 ms |
12748 KB |
Output is correct |
| 35 |
Correct |
123 ms |
13080 KB |
Output is correct |
| 36 |
Correct |
119 ms |
13568 KB |
Output is correct |
| 37 |
Correct |
163 ms |
13384 KB |
Output is correct |
| 38 |
Correct |
127 ms |
13004 KB |
Output is correct |
| 39 |
Correct |
137 ms |
13192 KB |
Output is correct |
| 40 |
Correct |
212 ms |
17724 KB |
Output is correct |
| 41 |
Correct |
306 ms |
23228 KB |
Output is correct |
