# 【费式搜寻法】

/*

*/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX 15
#define SWAP(x,y) {int t; t = x; x = y; y = t;}

void createfib(void);
int findx(int, int);

int fibsearch(int[], int); // 费氏搜寻
void quicksort(int[], int, int); // 快速排序
int Fib[MAX] = {-999};

int main(void) {
int number[MAX] = {0};
int i, find;
srand(time(NULL));
for(i = 1; i <= MAX; i++) {
number[i] = rand() % 100;
}

quicksort(number, 1, MAX);

printf("数列：");
for(i = 1; i <= MAX; i++)
printf("%d ", number[i]);
printf("\n输入寻找对象：");
scanf("%d", &find);

if((i = fibsearch(number, find)) >= 0)
printf("找到数字于索引 %d ", i);
else
printf("\n找不到指定数");
printf("\n");
return 0;
}

// 建立费氏数列
void createfib(void) {
int i;
Fib[0] = 0;
Fib[1] = 1;
for(i = 2; i < MAX; i++)
Fib[i] = Fib[i-1] + Fib[i-2];
}

// 找 x 值
int findx(int n, int find) {
int i = 0;
while(Fib[i] <= n)
i++;
i--;
return i;
}
// 费式搜寻
int fibsearch(int number[], int find) {
int i, x, m;
createfib();
x = findx(MAX+1,find);
m = MAX - Fib[x];
printf("\nx = %d, m = %d, Fib[x] = %d\n\n",
x, m, Fib[x]);
x--;
i = x;
if(number[i] < find)
i += m;
while(Fib[x] > 0) {
if(number[i] < find)
i += Fib[--x];
else if(number[i] > find)
i -= Fib[--x];
else
return i;
}
return -1;
}

void quicksort(int number[], int left, int right) {
int i, j, k, s;
if(left < right) {
s = number[(left+right)/2];
i = left - 1;
j = right + 1;
while(1) {
while(number[++i] < s) ; // 向右找
while(number[--j] > s) ; // 向左找
if(i >= j)
break;
SWAP(number[i], number[j]);
}

quicksort(number, left, i-1);// 对左边进行递回

quicksort(number, j+1, right); // 对右边进行递回
}
}

posted @ 2017-02-13 01:25  天秤libra  阅读(909)  评论(0编辑  收藏