leetcode/src/HOT100/Main33.java at master · codinglin/leetcode · GitHub

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package HOT100;

public class Main33 {
    public int search(int[] nums, int target) {
        int n = nums.length;
        if(n==0){
            return -1;
        }
        if(n==1){
            return nums[0] == target?0:-1;
        }
        int left=0, right=n-1, mid;
        while (left < right){
            mid = (left+right)/2;
            if(nums[mid] == target){
                return mid;
            }
            if(nums[left]<nums[mid]){
                if(nums[left]<=target && target<nums[mid]){
                    right=mid-1;
                }else{
                    left=mid+1;
                }
            }else{
                if(nums[mid]<target && target<=nums[right]){
                    left=mid+1;
                }else{
                    right=mid-1;
                }
            }
        }
        return -1;
    }
}