class Solution {
public int search(int[] nums, int target) {
if(nums.length==0){
return -1;
}
int left=0;
int right=nums.length-1;
int mid;
while(left<right){
mid=left+(right-left)/2;
if(target==nums[mid]){
return mid;
}
if(nums[left]<=nums[mid]){
//前半部分
if(target>=nums[left]&&target<nums[mid]){
right=mid-1;
}else{
left=mid+1;
}
}else{
if(target<=nums[right]&&target>nums[mid]){
left=mid+1;
}else{
right=mid-1;
}
}
}
return -1;
}
}
随时随地看视频
