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How to find the number of times array is rotated in the sorted array by recursion using C#?
Find index of mid element (minimum element) Apply Binary Search on the subarray based on following conditions −
If number lies between start element and element at mid1 position.
Then find number in array start to mid-1 using binary search
Else if number lies between mid and last element, then find number in array mid to last element using binary search.
Example
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace ConsoleApplication{
public class Arrays{
public int FindNumberRotated(int[] array, int start, int end, int value){
if (start > end){
return -1;
}
int mid = (start + end) / 2;
if (array[mid] == value){
return mid;
}
if (array[start] <= array[mid]){
if (value >= array[start] && value <= array[mid]){
return FindNumberRotated(array, start, mid - 1, value);
}
return FindNumberRotated(array, mid + 1, end, value);
}
if (value >= array[mid] && value <= array[end]){
return FindNumberRotated(array, mid + 1, end, value);
}
return FindNumberRotated(array, start, mid - 1, value);
}
}
class Program{
static void Main(string[] args){
Arrays a = new Arrays();
int[] arr = { 3, 4, 5, 6, 7, 8, 9, 10, 1, 2 };
int res = a.FindNumberRotated(arr, 0, arr.Length - 1, 1);
Console.WriteLine(res);
}
}
}Output
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Updated on: 27-Aug-2021
214 Views
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