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#include <stdlib.h>
#include <stdio.h>
#include "cover.h"
element* insert_element(set* s, int id) {
element* el = malloc(sizeof(element));
el->id = id;
el->set = s;
el->prev = el->next = NULL;
if (s->head) {
el->next = s->head;
s->head->prev = el;
}
s->head = el;
return el;
}
set* new_set(int id) {
set* s = malloc(sizeof(set));
s->id = id;
s->prev = s->next = NULL;
s->head = NULL;
s->bucket = NULL;
return s;
}
parent* new_parent(element* el) {
parent* p = malloc(sizeof(parent));
p->pos = el;
p->next = NULL;
return p;
}
void insert_parent(parent** parents, element* el) {
int id = el->id;
parent* p = new_parent(el);
if (parents[id]) {
p->next = parents[id];
}
parents[id] = p;
}
bucket* new_bucket(set* s, int size) {
bucket* b = malloc(sizeof(bucket));
b->size = size;
b->prev = b->next = NULL;
b->head = s;
s->bucket = b;
s->prev = s->next = NULL;
return b;
}
void insert_set(set* s, bucket* b) {
s->next = b->head;
s->prev = NULL;
s->bucket = b;
b->head->prev = s;
b->head = s;
}
void remove_bucket(bucket* b) {
if (b->prev) {
b->prev->next = b->next;
}
if (b->next) {
b->next->prev = b->prev;
}
free(b);
}
void detach_set(set* s) {
if (s->next) {
s->next->prev = s->prev;
}
if (s->prev) {
s->prev->next = s->next;
} else {
s->bucket->head = s->next;
}
s->prev = s->next = NULL;
s->bucket = NULL;
}
void attach_set(set* s, int size, bucket* b) {
if (b->size == size) {
insert_set(s, b);
} else {
bucket* nb = new_bucket(s, size);
nb->prev = b;
nb->next = b->next;
nb->prev->next = nb;
if (nb->next) {
nb->next->prev = nb;
}
}
}
void demote(set* s) {
bucket* b = s->bucket;
detach_set(s);
int size = b->size - 1;
if (size == 0) {
free(s);
} else if (!b->prev) {
bucket* nb = new_bucket(s, size);
nb->next = b;
b->prev = nb;
} else {
attach_set(s, size, b->prev);
}
if (!b->head) {
remove_bucket(b);
}
}
void remove_element(element* el) {
if (el->next) {
el->next->prev = el->prev;
}
if (el->prev) {
el->prev->next = el->next;
} else {
el->set->head = el->next;
}
demote(el->set);
free(el);
}
void remove_parents(element* el, parent** parents) {
parent* current = parents[el->id];
parent* temp;
while (current) {
temp = current;
if (current->pos != el) {
remove_element(current->pos);
}
current = current->next;
free(temp);
}
}
void greedy(bucket* head, parent** parents) {
bucket* b = head;
element* current = b->head->head;
printf("%d\n", current->set->id);
element* temp;
while (1) {
temp = current;
remove_parents(current, parents);
if (current->next) {
current = current->next;
} else if (current->set->next) {
current = current->set->next->head;
printf("%d\n", current->set->id);
} else if (current->set->bucket->prev) {
current = current->set->bucket->prev->head->head;
printf("%d\n", current->set->id);
} else {
break;
}
}
}
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