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SearchInRotatedSortedArray.java

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package Algorithms.array;

public class SearchInRotatedSortedArray {

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

if (A == null || A.length == 0) {

return -1;

}

int left = 0;

int right = A.length - 1;

while (left <= right) {

int mid = left + (right - left) / 2;

if (A[mid] == target) {

return mid;

}

// the left side is sorted.

if (A[mid] >= A[left]) {

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

// target is in the left side.

right = mid - 1;

} else {

// target is in the right side.

left = mid + 1;

}

} else { // the right side is sorted.

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

// target is in the right side.

left = mid + 1;

} else {

// target is in the right side.

right = mid - 1;

}

}

}

return -1;

}

}