include search folder in cmake

search/interpolation_search2.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+int InterpolationSearch(int A[], int n, int x) {
+    int low = 0;
+    int high = n - 1;
+    while (low <= high) {
+        int mid = low + (((high - 1) * (x - A[low])) / (A[high] - A[low]));
+        if (x == A[mid])
+            return mid;  // Found x, return (exit)
+        else if (x < A[mid])
+            high = mid - 1;  // X lies before mid
+        else
+            low = mid + 1;  // x lies after mid
+    }
+    return -1;
+}
+
+int main() {
+    int A[] = {2, 4, 5, 7, 13, 14, 15, 23};
+    int x = 17;
+    int index = InterpolationSearch(
+        A, 8, x);  // passed array A inside the InterpolationSearch function
+    if (index != -1)
+        std::cout << "Number " << x << " is at " << index;
+    else
+        std::cout << "Number " << x << " not found";
+}
+
+// randomly set x bcoz array was defined by us , therefore not reasonable for
+// asking input. We could have asked for input if array elements were inputed by
+// the user.