Search in Sorted Rotated Array in C

DSA_Codesheet/C/Search_Rotated_SortedArray.cpp

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+#include <stdio.h>  // Include the standard input/output library.
+
+// Function to search for a target element in a rotated and sorted array.
+int searchInRotatedSortedArray(int rotatedSortedArray[], int n, int target) {
+    int low = 0, high = n - 1;  // Initialize low and high pointers.
+
+    while (low <= high) {  // Perform a binary search in the array.
+        int mid = (low + high) / 2;  // Calculate the middle index of the current search range.
+
+        if (rotatedSortedArray[mid] == target) {  // If the middle element is the target, return its index.
+            return mid;
+        }
+
+        if (rotatedSortedArray[low] <= rotatedSortedArray[mid]) {
+            // If the left half is sorted (no rotation in this part):
+            if (rotatedSortedArray[low] <= target && target < rotatedSortedArray[mid]) {
+                high = mid - 1;  // Adjust the high pointer to search in the left half.
+            } else {
+                low = mid + 1;   // Adjust the low pointer to search in the right half.
+            }
+        } else {
+            // If the right half is sorted (no rotation in this part):
+            if (rotatedSortedArray[mid] < target && target <= rotatedSortedArray[high]) {
+                low = mid + 1;   // Adjust the low pointer to search in the right half.
+            } else {
+                high = mid - 1;  // Adjust the high pointer to search in the left half.
+            }
+        }
+    }
+
+    return -1;  // If the target element is not found, return -1.
+}
+
+int main() {
+    printf("Enter the size of the array: ");
+    int n;
+    scanf("%d", &n);  // Read the size of the array from the user.
+
+    int rotatedSortedArray[n];
+    printf("Enter the elements of the rotated sorted array: ");
+    for (int i = 0; i < n; ++i) {
+        scanf("%d", &rotatedSortedArray[i]);  // Read each element from the user and store it in the array.
+    }
+
+    int target;
+    printf("Enter the target element to search: ");
+    scanf("%d", &target);  // Read the target element from the user.
+
+    int result = searchInRotatedSortedArray(rotatedSortedArray, n, target);  // Call the search function.
+
+    if (result != -1) {
+        printf("Element %d found at index %d\n", target, result);  // Output the result if the target is found.
+    } else {
+        printf("Element %d not found in the array\n", target);  // Output a message if the target is not found.
+    }
+
+    return 0;
+}