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/*
Projet d'algorithmique et programmation 2013-2014
(cours de C.Matthieu et J.Stern)
Alex AUVOLAT, Mendes OULAMARA
Implémentation des ensembles d'entiers sous forme de bitsets.
Code sous la juridiction de Mendes OULAMARA.
*/
#include "sets.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#define SCOD (unsigned long long)(8*sizeof(unsigned long long))
int nbCells(int n){ //the mathematical ceil function
if(n == (n/SCOD)*SCOD)
return n/SCOD;
else
return n/SCOD+1;
}
int nb_one(unsigned long long x) { //the hamming weight of x
int cnt = 0, i;
for(i = 0; i < SCOD; i++)
cnt+= ((x>>i)&1);
return cnt;
}
int set_size(const set s){
return *(s.size);
}
set empty_set(int n){
assert(n > 0);
set res;
int i;
res.N = n;
res.size = malloc(sizeof(int));
*(res.size) = 0;
int NC = nbCells(n);
res.tab = malloc(SCOD*NC/8);
for(i = 0; i < NC; i++)
res.tab[i] = 0;
return res;
}
set copy_set(const set s){
set res = empty_set(s.N);
*(res.size) = *(s.size);
int NC = nbCells(s.N), i;
for(i = 0; i < NC; i++)
res.tab[i] = s.tab[i];
return res;
}
void delete_set(set a){
free(a.tab);
free(a.size);
}
void set_union_ip(set a, const set b){
if(a.N != b.N){
printf("Union failed : the sets don't have the same size\n");
assert(a.N == b.N);
}
int NC = nbCells(a.N), i;
*(a.size)=0;
for(i = 0; i < NC; i++) {
a.tab[i] = a.tab[i]|b.tab[i];
*(a.size) += nb_one(a.tab[i]);
}
}
void set_inter_ip(set a, const set b){
if(a.N != b.N){
printf("Intersection failed : the sets don't have the same size\n");
assert(a.N == b.N);
}
int NC = nbCells(a.N), i;
*(a.size)=0;
for(i = 0; i < NC; i++){
a.tab[i] = a.tab[i]&b.tab[i];
*(a.size) += nb_one(a.tab[i]);
}
}
void set_diff_ip(set a, const set b){
if(a.N != b.N){
printf("Difference failed : the sets don't have the same size\n");
assert(a.N == b.N);
}
int NC = nbCells(a.N), i;
for(i = 0; i < NC; i++) {
a.tab[i] = a.tab[i] & (~b.tab[i]);
*(a.size) += nb_one(a.tab[i]);
}
}
bool is_set_empty(const set s){
return (*(s.size) == 0);
}
inline bool set_mem(int x, const set s){
unsigned long long ux = x;
assert(x < s.N && x >= 0);
return (s.tab[ux/SCOD]>>(ux%SCOD))&1;
}
int dyadic_val(unsigned long long x){
if(x == 0){
printf("Infinite valuation\n");
assert(false);
}
int i;
for(i=0; ((x>>i)&1) == 0; i++);
return i;
}
int elt_of_set(const set s){
int N=nbCells(s.N), i;
for(i=0; i<N; i++)
if(s.tab[i] != 0)
return i*SCOD+dyadic_val(s.tab[i]);
printf("No element in an empty set!\n");
dump_set(s);
assert(false);
}
int elt_of_set_heur(const set s, int h){
int N=nbCells(s.N), i;
if(s.tab[h/SCOD]>>(h%SCOD) !=0)
return h + dyadic_val(s.tab[h/SCOD]>>(h%SCOD)) ;
for(i=0; i<N; i++)
if(s.tab[(i+h/SCOD+1)%N] != 0)
return i*SCOD+dyadic_val(s.tab[(i+h/SCOD+1)%N]);
printf("No element in an empty set!\n");
dump_set(s);
assert(false);
}
void set_add_ip(int x, set s){
unsigned long long ux = x;
if(! set_mem(ux, s)){
s.tab[ux/SCOD] = s.tab[ux/SCOD] | (unsigned long long)(1)<<(ux%SCOD);
*(s.size) = *(s.size)+1;
}
}
void set_remove_ip(int x, set s){
unsigned long long ux = x;
if(set_mem(ux, s) ) {
s.tab[ux/SCOD] = s.tab[ux/SCOD] & (~((unsigned long long)(1)<<(ux%SCOD)));
*(s.size) = *(s.size)-1;
}
}
void dump_set(const set s){
int i=0;
printf("[");
for(i=0; i < s.N; i++)
if(set_mem(i, s))
printf(" %d ", i);
printf("] (%d)\n", *(s.size));
}
set full_set(int n) {
set r = empty_set(n);
*(r.size) = n;
int NC=nbCells(n), i;
for(i=0; i< NC; i++)
r.tab[i]=-1;
return r;
}
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