Reverse [1, 2, 3, 4, 5, 6, 7] in-place.
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using System;
class Program
{
static void Main()
{
int[] arr = { 1, 2, 3, 4, 5, 6, 7 };
int l = 0, r = arr.Length - 1;
while (l < r) { (arr[l], arr[r]) = (arr[r], arr[l]); l++; r--; }
Console.WriteLine(string.Join(", ", arr));
}
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Two-pointer reverse.
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