w3resource

Java Array Exercises: Find the rotation count in a given rotated sorted array of integers

Java Array: Exercise-47 with Solution

Write a Java program to find the rotation count in a given rotated sorted array of integers.

Sample Solution:

Java Code:

import java.util.*;
import java.lang.*;
import java.io.*;
 
public class Main
{
  static int count_rotations(int arr_int[], int n)
    {
       int min_val = arr_int[0], min_index = -1;
        for (int i = 0; i < n; i++)
        {
            if (min_val > arr_int[i])
            {
                min_val = arr_int[i];
                min_index = i;
            }
        } 
        return min_index;
    }
    public static void main (String[] args) 
    {
          int arr_int[] = {35, 32, 30, 14, 18, 21, 27};
      // int arr_int[] = {35, 32, 14, 18, 21, 27};
      // int arr_int[] = {35, 14, 18, 21, 27};
           int n = arr_int.length;
            System.out.println(count_rotations(arr_int, n));
    }
}

Sample Output:

                                                                              
3

Flowchart:

Flowchart: Find the rotation count in a given rotated sorted array of integers

Visualize Java code execution (Python Tutor):


Java Code Editor:

Improve this sample solution and post your code through Disqus

Previous: Write a Java program to check whether there is a pair with a specified sum of a given sorted and rotated array.
Next: Write a Java program to arrange the elements of a given array of integers where all negative integers appear before all the positive integers.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb