/* Relink all lights that are so marked. */
void relink_light_sources(boolean ghostly, struct level *lev)
{
char which;
unsigned nid;
light_source *ls;
for (ls = lev->lev_lights; ls; ls = ls->next) {
if (ls->flags & LSF_NEEDS_FIXUP) {
if (ls->type == LS_OBJECT || ls->type == LS_MONSTER) {
if (ghostly) {
if (!lookup_id_mapping((long)ls->id, &nid))
impossible("relink_light_sources: no id mapping");
} else
nid = (long) ls->id;
if (ls->type == LS_OBJECT) {
which = 'o';
ls->id = find_oid(nid);
} else {
which = 'm';
ls->id = find_mid(lev, nid, FM_EVERYWHERE);
}
if (!ls->id)
impossible("relink_light_sources: cant find %c_id %d",
which, nid);
} else
impossible("relink_light_sources: bad type (%d)", ls->type);
ls->flags &= ~LSF_NEEDS_FIXUP;
}
}
}
int main(){
int n;
while(scanf("%d", &n) != EOF){
for(int i = 0;i < n;i ++){
scanf("%d", &arr[i]);
}
printf("%d\n", find_mid(arr, 0, n-1, n / 2));
}
return 0;
}
int find_mid(int arr[], int left, int right, int x)
//下标从零开始
{
if(left >= right){
return arr[left + x];
}
int mid = arr[left];
int i = left;
int j = right;
while(i < j){
while(i < j && arr[j] >= mid) j--;
arr[i] = arr[j];
while(i < j && arr[i] <= mid) i++;
arr[j] = arr[i];
}
arr[j] = mid;
if(i - left == x)
return arr[i];
if(i - left < x)
return find_mid(arr, i + 1, right, x - (i - left + 1));
else
return find_mid(arr, left, i - 1, x);
}
int splithalf(SLink **head, SLink **ahead, SLink **bhead)
{
//take local reference to traverse through the link
SLink *temp, *temp2, *temp3;
temp = *head;
//get the mid_value of the given list that needs to be split
int mid_value, i;
mid_value = find_mid(*head);
//check if list is empty
if (mid_value == EMPTYLIST)
{
return EMPTYLIST;
}
//if head has only one element,
if((*head) -> link == NULL)
{
*ahead = *head;
*bhead = NULL;
return SUCCESS;
}
//if mid_value is > 0
else
{
//iterate to the mid of a list and copy this into alist
while(temp)
{
if(temp -> data == mid_value)
{
break;
}
insert_at_last(ahead, temp -> data);
temp = temp -> link;
}
temp3 = temp;
// blist will be updated with temp2 which has second half
*bhead = temp3;
return SUCCESS;
}
return FAILURE;
}
/*
* This function is called every turn.
* It makes the regions age, if necessary and calls the appropriate
* callbacks when needed.
*/
void
run_regions(struct level *lev)
{
int i, j, k;
int f_indx;
/* End of life ? */
/* Do it backward because the array will be modified */
for (i = lev->n_regions - 1; i >= 0; i--) {
if (lev->regions[i]->ttl == 0) {
if ((f_indx = lev->regions[i]->expire_f) == NO_CALLBACK ||
(*callbacks[f_indx]) (lev->regions[i], 0))
remove_region(lev->regions[i]);
}
}
/* Process remaining lev->regions */
for (i = 0; i < lev->n_regions; i++) {
/* Make the region age */
if (lev->regions[i]->ttl > 0)
lev->regions[i]->ttl--;
/* Check if player is inside region */
f_indx = lev->regions[i]->inside_f;
if (f_indx != NO_CALLBACK && hero_inside(lev->regions[i]))
(void)(*callbacks[f_indx]) (lev->regions[i], 0);
/* Check if any monster is inside region */
if (f_indx != NO_CALLBACK) {
for (j = 0; j < lev->regions[i]->n_monst; j++) {
struct monst *mtmp =
find_mid(lev, lev->regions[i]->monsters[j], FM_FMON);
if (!mtmp || DEADMONSTER(mtmp) ||
(*callbacks[f_indx]) (lev->regions[i], mtmp)) {
/* The monster died, remove it from list */
k = (lev->regions[i]->n_monst -= 1);
lev->regions[i]->monsters[j] = lev->regions[i]->monsters[k];
lev->regions[i]->monsters[k] = 0;
--j; /* current slot has been reused; recheck it
next */
}
}
}
}
}