Merge pull request #33 from Aks1307/patch-4

InterpolationSearch.cpp

Author: Bhrigu Kansra

searching/InterpolationSearch.cpp

@@ -0,0 +1,33 @@
+// C program to implement interpolation search 
+#include<stdio.h> 
+  
+// If x is present in arr[0..n-1], then returns 
+// index of it, else returns -1. 
+int interpolationSearch(int arr[], int n, int x) 
+{ 
+    // Find indexes of two corners 
+    int lo = 0, hi = (n - 1); 
+  
+    // Since array is sorted, an element present 
+    // in array must be in range defined by corner 
+    while (lo <= hi && x >= arr[lo] && x <= arr[hi]) 
+    { 
+        // Probing the position with keeping 
+        // uniform distribution in mind. 
+        int pos = lo + (((double)(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 upper part 
+        if (arr[pos] < x) 
+            lo = pos + 1; 
+  
+        // If x is smaller, x is in the lower part 
+        else
+            hi = pos - 1; 
+    } 
+    return -1; 
+}