搜索旋转排序数组 II
解法一:二分查找法
public class LeetCode_081 {
public static boolean search(int[] nums, int target) {
if (nums.length == 1) {
if (nums[0] == target) {
return true;
} else {
return false;
}
}
// 最大值的位置
int maxIndx = -1;
for (int i = 0; i < nums.length - 1; i++) {
if (nums[i] > nums[i + 1]) {
maxIndx = i;
break;
}
}
int result;
if (target <= nums[nums.length - 1]) {
result = find(nums, maxIndx + 1, nums.length - 1, target);
} else {
result = find(nums, 0, maxIndx, target);
}
return result != -1;
}
/**
* 二分查找
*
* @param nums
* @param left
* @param right
* @param target
* @return
*/
public static int find(int[] nums, int left, int right, int target) {
int mid;
while (left <= right) {
mid = (left + right) / 2;
if (nums[mid] == target) {
return mid;
} else if (nums[mid] < target) {
left = mid + 1;
} else {
right = mid - 1;
}
}
return -1;
}
public static void main(String[] args) {
int[] nums = new int[]{2, 5, 6, 0, 0, 1, 2};
System.out.println(search(nums, 3));
}
}