while (index < len && *(post + len - 1) != *(order + index)) {
index ++;
}
t = (btree *)malloc(sizeof(btree));
t->data = *(order + index);
t->lchild = rebuildTree(order, post, index);
t->rchild = rebuildTree(order + index + 1, post + index, len - (index + 1));
}
return t;
}
/**
* 前序遍历二叉树
*/
void preTraverse(btree *t)
{
if (t) {
printf("%c ", t->data);
preTraverse(t->lchild);
preTraverse(t->rchild);
}
}
int main(void)
{
int i;
char *post, *order;
btree *t;
while (scanf("%d", &n) != EOF) {
post = (char *)malloc(n);
order = (char *)malloc(n);
getchar();
for (i = 0; i < n; i ++)
scanf("%c", order + i);
getchar();
for (i = 0; i < n; i ++)
scanf("%c", post + i);
t = rebuildTree(order, post, n);
preTraverse(t);
printf("n");
free(post);
free(order);
}
return 0;
}