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Cod sursa(job #318592)
#include <stdio.h>
#include <stdlib.h>
int **a, **stramos, *cul, *p, *q;
void dfs (int u, int timp) {
timp++;
cul[u] = 1;
int i, j, v;
for (i=1; i <= a[u][0]; ++i) {
v = a[u][i];
if (cul [v] == 0) {
for (j = 2; j <= timp; ++j)
stramos [v][j] = stramos [stramos [v][j-1]][1];
dfs (v, timp);
}
}
}
int main() {
int i, x, n, m;
FILE *f = fopen ("stramosi.in", "r"), *fout = fopen ("stramosi.out", "w");
fscanf (f, "%d %d", &n, &m);
a = malloc ((n+1) * sizeof (int));
p = malloc ((m+1) * sizeof (int));
q = malloc ((m+1) * sizeof (int));
stramos = malloc ((n+1) * sizeof (int));
for (i=0; i <= n; ++i) {
a [i] = malloc (1 * sizeof (int));
stramos [i] = calloc (2, sizeof (int));
a [i][0] = 0;
}
for (i=1; i <= n; ++i) {
fscanf (f, "%d", &x);
a[x] = realloc (a[x], (a[x][0] + 2) * sizeof (int));
a[x] [++a [x][0]] = i;
stramos [i][1] = x;
}
cul = calloc ((n+1) , sizeof (int));
for (i=0; i < m; ++i) {
fscanf (f, "%d %d", &p[i], &q[i]);
if (stramos [p[i]][0] < q[i]) {
stramos [p[i]] = realloc (stramos [p[i]], (q[i] + 1) * sizeof (int));
stramos [p[i]][0] = q [i];
}
}
for (i=1; i <= a[0][0]; ++i)
dfs (a[0][i],0);
for (i=0; i < m; ++i)
fprintf ( fout, "%d\n", stramos [p[i]][q[i]]);
fclose (f);
fclose (fout);
return 0;
}