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SearchInRotatedSortedArray.java ( File view )

  • By issaczr 2014-10-24
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			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/search-in-rotated-sorted-array/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/22864861

// Suppose a sorted array is rotated at some pivot unknown to you beforehand.
// (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).
// You are given a target value to search. 
// If found in the array return its index, otherwise return -1.
// You may assume no duplicate exists in the array.

public class SearchInRotatedSortedArray {

	public int search(int[] A, int target) {

		int left = 0;
		int right = A.length - 1;

		while (left <= right) {

			int mid = (left + right) / 2;

			if (A[mid] == target) {

				return mid;
			
}

			if (A[mid] >= A[left]) {
 
				if (A[mid] > target && A[left] <= target) {

					right = mid - 1;
				
} else {

					left = mid + 1;
				
}
			
} else {

				if (A[mid] < target && A[right] >= target) {

					left = mid + 1;
				
} else {

					right = mid - 1;
				
}
			
}
		
}

		return -1;
	
}

	public static void main(String[] args) {

		int[] a = {
 3, 1, 2 
};

		SearchInRotatedSortedArray slt = new SearchInRotatedSortedArray();
		System.out.println(slt.search(a, 1));
		System.out.println(slt.search(a, 4));
	
}

}			
...
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