数据结构-二分查找(Binary Search)

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define LIST_INIT_SIZE 10
#define LISTINCREMENT 100
#define STACK_INIT_SIZE 100
#define STACKINCREMENT 10
#define TRUE 1
#define FALSE 0
#define true 1
#define false 0
#define OK 1
#define ERROR 0
#define INFEASIBLE -1
#define OVERFLOW -2
#define OPSETSIZE 7
#define MAXQSIZE 100
#define EQ(a, b) ((a) == (b))
#define LT(a, b) ((a) < (b))

typedef int ElemType;
typedef struct
{
    ElemType *elem;
    int  length;
} SSTable;

int CreatSST(SSTable *sst, int n, ElemType key);
int Search_Seq(SSTable *ST, ElemType key);
int Search_Bin(SSTable ST, ElemType key);
int sort(SSTable *s, int n);

int main()
{
    printf("Please input the number of the static search table:\n");
    int n, i;
    scanf("%d",&n);
    printf("Please input a table:\n");
    SSTable sst;
    ElemType key;
    CreatSST(&sst, n, key);
    for(i= 0; i< n; i++)
        scanf("%d",&sst.elem[i+1]);
    printf("The static search table is:\n");
    for(i= 0; i< n ;i++)
        printf("%d%c", sst.elem[i+1], i== n- 1? '\n': ' ');
    printf("Please input the element to search:\n");
    scanf("%d", &key);
    printf("The position is %d\n", Search_Seq(&sst, key));
    printf("Next,using binary search->\n");
    printf("After sort,the static search table is:\n");
    sort(&sst, n);
    for(i= 0; i< n ;i++)
        printf("%d%c", sst.elem[i+1], i== n- 1? '\n': ' ');
    printf("Please input the element to search:\n");
    scanf("%d", &key);
    printf("The position is: %d\n", Search_Bin(sst, key));
    return 0;
}

int CreatSST(SSTable *sst, int n, ElemType key)
{
    int i= 0;
    sst->elem = (ElemType*)malloc((n + 1) * sizeof(ElemType));
    if(!sst->elem)
        exit(OVERFLOW);
    sst->elem[0] = key;
    sst->length = n;
    if(!sst->length)
        exit(OVERFLOW);
    return OK;
}

int Search_Seq(SSTable *ST, ElemType key)
{
    int i;
    ST->elem[0] = key;
    for (i=ST->length; !EQ(ST->elem[i], key); --i);
    return i;
}

int Search_Bin(SSTable ST,ElemType key)
{
    int low=1;
    int high=ST.length;
    while (low<=high)
    {
        int mid=(low+high)/2;
        if (EQ(key,ST.elem[mid])) return mid;
        else if (LT(key, ST.elem[mid])) high=mid-1;
        else low=mid+1;
    }
    return 0;
}

int sort(SSTable *s, int n)
{
    int i, j;
    ElemType temp;
    for(i = 1; i<= n; i++)
        for(j = 1; j<= n- i; j++)
            if(s->elem[j] > s->elem[j+1])
                temp = s->elem[j], s->elem[j] = s->elem[j+1], s->elem[j+1] = temp;
}