Question

How to reverse subarray of an array in C#

Answer 1

using System;

class Program
{
    static void reverseSubarray(int[] arr, int start, int end) {
        if (end > arr.Length) {
            Console.WriteLine("End index out of range");
            return;
        }
     
        int mid_sub = (end - start + 1) / 2;
         
        for (int i = 0; i < mid_sub; i++) {
            int tmp = arr[start + i];
            arr[start + i] = arr[end - i];
            arr[end - i] = tmp;
        }
    }
    static void Main() {
        int[] arr = { 1, 4, 8, 0, 7, 3, 9, 5, 6 };
        
        int start = 2, end = 6;
         
        reverseSubarray(arr, start, end);
 
        Console.WriteLine(String.Join(" ", arr));
    }
}



 
 
/*
run:
 
1 4 9 3 7 0 8 5 6

*/
 

 

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