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:

Visualize Java code execution (Python Tutor):
Java Code Editor:
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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.
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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
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