Create in_CPP.cpp (#167)

* Create in_CPP.cpp

Added interpolation search in cpp

* Rename Searching/in_CPP.cpp to Interpolation Search/in_CPP.cpp

Renamed the folder to interpolation search.

* Rename Interpolation Search/in_CPP.cpp to Searching/Interpolation-Searching/in_CPP.cpp

Added interpolation search in cpp in existing inerpolation search folder

* Rename Searching/Interpolation-Searching/in_CPP.cpp to Searching/Interpolation-Search/in_CPP.cpp

Searching/Interpolation-Search/in_CPP.cpp

@@ -0,0 +1,54 @@
+/* C++ program to implement interpolation
+ search.
+ 
+The Interpolation Search is an improvement over Binary Search for instances, where the values in a sorted array are uniformly distributed.
+Interpolation constructs new data points within the range of a discrete set of known data points. Binary Search always goes to the middle element to check.
+On the other hand, interpolation search may go to different locations according to the value of the key being searched. 
+For example, if the value of the key is closer to the last element, interpolation search is likely to start search toward the end side.
+Time Complexity: O(log2(log2 n)) for the average case, and O(n) for the worst case 
+Auxiliary Space Complexity: O(1)
+*/
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int interpolationSearch(int arr[], int lo, int hi, int x)
+{
+	int pos;
+
+	if (lo <= hi && x >= arr[lo] && x <= arr[hi]) {
+
+		pos = lo
+			+ (((double)(hi - lo) / (arr[hi] - arr[lo]))
+				* (x - arr[lo]));
+		if (arr[pos] == x)
+			return pos;
+
+		if (arr[pos] < x)
+			return interpolationSearch(arr, pos + 1, hi, x);
+
+		if (arr[pos] > x)
+			return interpolationSearch(arr, lo, pos - 1, x);
+	}
+	return -1;
+}
+
+int main()
+{
+
+	int arr[] = { 10, 12, 13, 16, 18, 19, 20, 21,
+				22, 23, 24, 33, 35, 42, 47 };
+
+	int n = sizeof(arr) / sizeof(arr[0]);
+
+	int x = 18;
+	int index = interpolationSearch(arr, 0, n - 1, x);
+
+	if (index != -1)
+		cout << "Element found at index " << index;
+	else
+		cout << "Element not found.";
+
+	return 0;
+}
+