#include <stdio.h>
#include <stdlib.h>
#define N 100000
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 rr[N], dd[N], ta[N], tb[N]; char visited[N];
void dfs(int i, int r, int d) {
static int time;
int o;
if (visited[i] == 1)
return;
visited[i] = 1;
ta[i] = time++;
rr[i] = r, dd[i] = d;
for (o = eo[i]; o--; ) {
int j = ej[i][o];
dfs(j, r, d + 1);
}
tb[i] = time;
}
int ft[N];
void update(int i, int n, int x) {
while (i < n) {
ft[i] += x;
i |= i + 1;
}
}
int query(int i) {
int x = 0;
while (i >= 0) {
x += ft[i];
i &= i + 1, i--;
}
return x;
}
int main() {
static int pp[N];
int n, m, i, j;
scanf("%d", &n);
for (i = 0; i < n; i++)
ej[i] = (int *) malloc(2 * sizeof *ej[i]);
for (i = 0; i < n; i++) {
scanf("%d", &pp[i]), pp[i]--;
if (pp[i] != -1)
append(pp[i], i);
}
for (i = 0; i < n; i++) {
if (visited[i])
continue;
j = i;
while (pp[j] != -1 && !visited[j])
visited[j] = -1, j = pp[j];
dfs(j, j, 0);
}
scanf("%d", &m);
while (m--) {
int t, ans;
scanf("%d", &t);
if (t == 1) {
scanf("%d", &i), i--;
pp[i] = -1;
update(ta[i], n, 1), update(tb[i], n, -1);
} else {
scanf("%d%d", &i, &j), i--, j--;
if (ta[j] <= ta[i] && tb[i] <= tb[j])
ans = query(ta[i]) - query(ta[j]) == 0 ? dd[i] - dd[j] : -1;
else {
if (query(ta[i]) > 0)
ans = -1;
else {
ans = dd[i] + 1;
if ((i = pp[rr[i]]) == -1 || ta[i] < ta[j] || ta[i] >= tb[j])
ans = -1;
else
ans = query(ta[i]) - query(ta[j]) == 0 ? ans + dd[i] - dd[j] : -1;
}
}
printf("%d\n", ans);
}
}
return 0;
}
Compilation message
specialg.c: In function 'append':
specialg.c:11:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
11 | if (o >= 2 && (o & o - 1) == 0)
| ~~^~~
specialg.c: In function 'main':
specialg.c:58:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
58 | scanf("%d", &n);
| ^~~~~~~~~~~~~~~
specialg.c:62:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
62 | scanf("%d", &pp[i]), pp[i]--;
| ^~~~~~~~~~~~~~~~~~~
specialg.c:74:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
74 | scanf("%d", &m);
| ^~~~~~~~~~~~~~~
specialg.c:78:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
78 | scanf("%d", &t);
| ^~~~~~~~~~~~~~~
specialg.c:80:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
80 | scanf("%d", &i), i--;
| ^~~~~~~~~~~~~~~
specialg.c:84:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
84 | scanf("%d%d", &i, &j), i--, j--;
| ^~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
432 KB |
Output is correct |
| 2 |
Correct |
2 ms |
468 KB |
Output is correct |
| 3 |
Correct |
2 ms |
492 KB |
Output is correct |
| 4 |
Correct |
4 ms |
468 KB |
Output is correct |
| 5 |
Correct |
2 ms |
468 KB |
Output is correct |
| 6 |
Correct |
8 ms |
732 KB |
Output is correct |
| 7 |
Correct |
11 ms |
720 KB |
Output is correct |
| 8 |
Correct |
8 ms |
680 KB |
Output is correct |
| 9 |
Correct |
9 ms |
688 KB |
Output is correct |
| 10 |
Correct |
8 ms |
724 KB |
Output is correct |
| 11 |
Correct |
63 ms |
15400 KB |
Output is correct |
| 12 |
Correct |
64 ms |
8816 KB |
Output is correct |
| 13 |
Correct |
54 ms |
11184 KB |
Output is correct |
| 14 |
Correct |
52 ms |
7884 KB |
Output is correct |
| 15 |
Correct |
56 ms |
9204 KB |
Output is correct |
| 16 |
Correct |
53 ms |
8972 KB |
Output is correct |
| 17 |
Correct |
67 ms |
13768 KB |
Output is correct |
| 18 |
Correct |
66 ms |
13708 KB |
Output is correct |
| 19 |
Correct |
62 ms |
13692 KB |
Output is correct |
| 20 |
Correct |
60 ms |
15580 KB |
Output is correct |
