C 实现位图排序

 

 

应用场景：

 

     1到N的不重复乱序数据，乱序数据总最大不超过N，需要高效的排序。

 

sorr.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define mask 0x1F
#define shift 5
/**************************
 * function name: bitVect
 * description :according size to malloc memory
 * params :
 *    size --input array size,every element in array can't over size
 * return : return a fixed memory 
 *************************/
int *bitVect(int size)
{
    int arr_size=0;
    int *pt=NULL;
    if((size%(1<<shift))==0)
    {
        arr_size=size/(1<<shift);
    }
    else
    {
        arr_size=(size/(1<<shift))+1;
    }
    printf(" malloc sizeof(int) count :%d\n",arr_size);
    pt=(int *)malloc(sizeof(int)*arr_size);
    if(!pt){fprintf(stderr," can't malloc memory \n");return NULL;}
    memset(pt,0,arr_size);
    return  pt;
}
/*************************
 * function name: bitFree
 * description :free a memory named target
 * params :
 *    target --a pointer that is needed to free
 * return : if opertation is ok,that return 1
 * ***********************/
int bitFree(void *target)
{
    if(target!=NULL)
    {
      free(target);
      target=NULL;
      printf(" target free ok\n");
    }
    else
    {
        return 1;
    }
    return 0;
}
/***********************
 * function name:setBit
 * description :set bit value in one element from array
 * params :
 *     
 *    
 *********************/
void setBit(int elem,int *parr)
{
  int pos=elem>>shift;
  //printf(" pos = %d\n",pos);
  *(parr+pos)|=(1<<(pos&mask));
}
void clsBit(int n,int *parr)
{
    int pos=n>>shift;
   // printf("clsBit pos : %d\n",pos);
    *(parr+pos)&=(~(1<<(pos&mask)));
}
int isOne(int elem,int *parr)
{
    int pos=elem>>shift;
    int flag= *(parr+pos)&(1<<(pos&mask));
    //printf("\tisOne:%d\n",flag);
    return flag;
}
void  test()
{
    int *parr=bitVect(6);
    int arr[6]={1,5,4,3,2,6};
    printf("reginal data :\n");
    int i=1;
    for(;i<=6;i++)
    {
        clsBit(i,parr);
        if(i==6)
        {
            printf("%d\n",arr[i-1]);
        }
        else
        {
            printf("%d,",arr[i-1]);
        }
    }
    printf("\n");
    i=0;
    for(;i<=6;i++)
    {
        setBit(arr[i-1],parr);
    }
    i=1;
    printf("sort data :\n");
    for(;i<=6;i++)
    {
        if(isOne(i,parr))
        {
            if(i==6)
            {
                printf(" %d\n",i);
            }
            else
            {
                printf(" %d,",i);
            }
        }
    }
    printf(" bitFree(%p) :%d\n",parr,bitFree(parr));
}
int main(void)
{
    test();
    return 0;
}