diff --git a/algorithms/Java/README.md b/algorithms/Java/README.md index 252d6dbe..815f73b9 100644 --- a/algorithms/Java/README.md +++ b/algorithms/Java/README.md @@ -44,6 +44,7 @@ 2. [Jump Search](searching/jump-search.java) 3. [Linear Search](searching/linear-search.java) 4. [Allocate minimum number of pages](searching/allocate-min-pages.java) +5. [Interpolation Search](searching/interpolation-search.java) ## Sorting diff --git a/algorithms/Java/searching/interpolation-search.java b/algorithms/Java/searching/interpolation-search.java new file mode 100644 index 00000000..28d08cef --- /dev/null +++ b/algorithms/Java/searching/interpolation-search.java @@ -0,0 +1,50 @@ +// Java program to implement interpolation search with recursion +import java.util.*; +class GFG { + + // If x is present in arr[0..n-1], then returns index of it, else returns -1. + public static int interpolationSearch(int arr[], int lo, int hi, int x) + { + int pos; + + // Since array is sorted, an element present in array must be in rangedefined by corner + if (lo <= hi && x >= arr[lo] && x <= arr[hi]) { + + // Probing the position with keeping uniform distribution in mind. + pos = lo + (((hi - lo) / (arr[hi] - arr[lo])) * (x - arr[lo])); + + // Condition of target found + if (arr[pos] == x) + return pos; + + // If x is larger, x is in right sub array + if (arr[pos] < x) + return interpolationSearch(arr, pos + 1, hi, x); + + // If x is smaller, x is in left sub array + if (arr[pos] > x) + return interpolationSearch(arr, lo, pos - 1, x); + } + return -1; + } + + // Driver Code + public static void main(String[] args) + { + + // Array of items on which search will be conducted. + int arr[] = { 10, 12, 13, 16, 18, 19, 20, 21, 22, 23, 24, 33, 35, 42, 47 }; + + int n = arr.length; + + // Element to be searched + int x = 18; + int index = interpolationSearch(arr, 0, n - 1, x); + + // If element was found + if (index != -1) + System.out.println("Element found at index "+ index); + else + System.out.println("Element not found."); + } +}