//旋转数组的最小数字
//题目:把一个数组最開始的若干个元素搬到数组的末尾。我们称之为数组的旋转。
//输入一个递增排序的数组的一个旋转。输出旋转数组中的最小元素。
//比如:数组{3。4,5,1,2}为{1,2。3。4。5}的一个旋转,最小元素是1。
#include <stdio.h>
#include <assert.h>
int min_equ(int *src, int left, int right)
{
int i = 0;
int ret = src[left];
assert(src != NULL);
for (; i < right; ++i)
{
if (ret >src[i])
return src[i];
}
return ret;
}
int find_a_num(int *src, int len)
{
int left = 0;
int right = len - 1;
int mid = left;
assert(src != NULL);
while (src[left] >= src[right])
{
if (right - left == 1)
{
mid = right;
break;
}
mid = (left + right) / 2;
if (src[left] == src[right] && src[mid] == src[right])
{
return min_equ(src, left, right);
}
if (src[mid]>src[left])
{
left = mid;
}
if (src[mid]<src[right])
{
right = mid;
}
}
return src[mid];
}
int main()
{
int src[] = { 3, 4, 5, 1, 2 };
int dst[] = { 1, 0, 1, 1, 1 };
int len = sizeof(src) / sizeof(src[0]);
int len1 = sizeof(dst) / sizeof(dst[0]);
printf("%d\n", find_a_num(src, len));
printf("%d\n", find_a_num(dst, len1));
return 0;
}