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How to rotate an array k time using C#?
Given an array and number k, the problem states that we have to rotate the array k times.
If the given number is 3 then the array must be rotated 3 times.
Create a function reverse which takes the array, start and end as a parameter.
In the 1st step call reverse method from 0 to array length.
In the 2nd step call the reverse method from 0 to k-1.
In the 3rd step call the reverse method from k+1 to array length.
Example
using System;
namespace ConsoleApplication{
public class Arrays{
public void ReverseArrayKTimes(int[] arr, int k){
Reverse(arr, 0, arr.Length - 1);
Reverse(arr, 0, k - 1);
Reverse(arr, k, arr.Length - 1);
}
private void Reverse(int[] arr, int start, int end){
while (start < end){
int temp = arr[start];
arr[start] = arr[end];
arr[end] = temp;
start++;
end--;
}
}
}
class Program{
static void Main(string[] args){
Arrays a = new Arrays();
int[] arr = { 9, 8, 7, 6, 5, 4, 3, 2, 1 };
a.ReverseArrayKTimes(arr, 3);
for (int i = 0; i < arr.Length; i++){
Console.WriteLine(arr[i]);
}
Console.ReadLine();
}
}
}Output
3 2 1 9 8 7 6 5 4
Updated on: 27-Aug-2021
748 Views
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