Search in Rotated Sorted Array.java

class Solution {
    public int search(int[] nums, int target) {
        int pivot = findPivot(nums);
        int ans = binarySearch(nums, target, 0, pivot);
        if(ans!=-1){
            return ans;
        }
        return binarySearch(nums, target, pivot+1, nums.length-1);
    }
    
    public int findPivot(int[] arr){
        int start = 0, end = arr.length-1;
        while(start<=end){
            int mid = start + (end-start)/2;
            if(mid<end && arr[mid]>arr[mid+1]){
                return mid;
            }
            if(mid>start && arr[mid-1]>arr[mid]){
                return mid-1;
            }
            if(arr[mid]<=arr[start]){
                end = mid-1;
            }else{
                start = mid+1;
            }
        }
        return -1;
    }
    
    public int binarySearch(int[] arr, int target, int start, int end){
        
        while(start<=end){
            int mid = start+ (end-start)/2;
            
            
                if(target<arr[mid]){
                    end = mid-1;
                }else if(target>arr[mid]){
                    start = mid+1;
                }else{
                    return mid;
                }
            
            
        }
        return -1;
    }
    
}