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| 1 | +public class SearchinSortedArray { |
| 2 | + public static int Search(int arr[], int target, int start, int end) { |
| 3 | + |
| 4 | + // Base Case |
| 5 | + if (start > end) { |
| 6 | + return -1; |
| 7 | + } |
| 8 | + |
| 9 | + int mid = start + (end - start) / 2; |
| 10 | + // if the target element is at the middle of the array |
| 11 | + if (target == arr[mid]) { |
| 12 | + return mid; |
| 13 | + } |
| 14 | + // If mid lie on line one |
| 15 | + if (arr[start] <= arr[mid]) { |
| 16 | + // Left Side: if target is greater then starting element but less than the |
| 17 | + // middle element |
| 18 | + if (arr[start] <= target && target <= arr[mid]) { |
| 19 | + return Search(arr, target, start, mid - 1); |
| 20 | + } |
| 21 | + // Right Side: if target is |
| 22 | + else { |
| 23 | + return Search(arr, target, mid + 1, end); |
| 24 | + } |
| 25 | + |
| 26 | + } |
| 27 | + // If mid lies on the line two |
| 28 | + else { |
| 29 | + // Right Side: if target is greater then starting element but less than the |
| 30 | + // middle element |
| 31 | + if (arr[mid] <= target && target <= arr[end]) { |
| 32 | + return Search(arr, target, start, mid - 1); |
| 33 | + } |
| 34 | + // left Side: |
| 35 | + else { |
| 36 | + return Search(arr, target, mid + 1, end); |
| 37 | + } |
| 38 | + } |
| 39 | + |
| 40 | + } |
| 41 | + |
| 42 | + public static void main(String[] args) { |
| 43 | + int arr[] = { 4, 5, 6, 7, 0, 1, 2, 3 }; |
| 44 | + int target = 4; |
| 45 | + int index = Search(arr, target, 0, arr.length - 1); |
| 46 | + System.out.println(index); |
| 47 | + } |
| 48 | + |
| 49 | +} |
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