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Hash.cpp
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Hash.cpp
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#ifndef HASH_CPP
#define HASH_CPP
#include "cidade.cpp"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#define SIZE 1024
typedef dataItem *hash[SIZE];
void init(hash &H) {
for (int i = 0; i < SIZE; i++) {
H[i] = 0;
}
}
int inserir(hash H, dataItem *d, int (*funcHash)(dataItem *)) {
int key = funcHash(d);
dataItem *copy = (dataItem*)malloc(sizeof(dataItem));
*copy = *d;
if (H[key] == 0) {
H[key] = copy;
return 0;
}
return -1;
}
int remover(hash H, dataItem *d, int (*funcHash)(dataItem *)) {
int key = funcHash(d);
if (H[key] != 0) {
dataItem *purge = H[key];
delete purge; //linux
// free(purge); //windows
H[key] = 0;
return 0;
}
return -1;
}
dataItem *buscar(hash H, int key, int (*funcHash)(dataItem *)){
dataItem *res = (dataItem*)malloc(sizeof(dataItem));
res->key = key;
int pos = funcHash(res);
res = H[pos];
return res;
}
int divisao(dataItem *d) {
return d->key % SIZE;
}
typedef unsigned long long int bigNumber;
int multiplicacao(dataItem *d) {
bigNumber key = (bigNumber)d->key;
key *= key;
int digits = ceil(log2((bigNumber)540000 * 540000));
int signif = ceil(log2(SIZE - 1));
int remover = digits - signif;
int digitMask = (int)ceil(float(remover) / 2);
bigNumber mask = ((SIZE-1) << digitMask);
key = key & mask;
key = (key >> digitMask);
return key;
}
#endif