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Search in Rotated Sorted Array

时间:2015-08-02 21:24:04      阅读:117      评论:0      收藏:0      [点我收藏+]

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class Solution {
public:
    int search(vector<int>& nums, int target) {
        return rotate_search(nums,0,nums.size()-1,target);
    }
    int rotate_search(vector<int>& nums,int l,int r, int target){
        int left=l;
        int right=r;
        int mid = (left + right)/2;
        
        if(left > right) return -1;
        if(left == right) return target==nums[mid]?right:-1;
        
        if(nums[mid] >= nums[left]){
            { cout<<"1"<<left<<" "<<mid;
            int temp =binary_search(nums,left, mid, target); 
            if(temp != -1)
                return temp;
            }
             {cout<<"2";return rotate_search(nums,mid+1,right,target);  }
        }
        else{
                {      cout<<"3:"<<mid<<" "<<right;
                int temp =binary_search(nums, mid, right, target);
                if(temp != -1)
                return  temp;
          
            }
                { cout<<"4";return rotate_search(nums,left,mid-1,target);    }
        }
        
        return -1;
    }
    int binary_search(vector<int>& nums,int l,int r, int target){
        int left=l;
        int right=r;
        int mid; mid = (left + right)/2;
        if(left > right) return -1;
        if(left == right) return nums[mid]==target?left:-1;
           
        if(nums[mid] == target) return mid;
        else if(nums[mid] < target) return binary_search(nums,mid+1,r,target);
        return binary_search(nums,l,mid-1,target);
    }
};

 

Search in Rotated Sorted Array

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原文地址:http://www.cnblogs.com/julie-yang/p/4696661.html

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