Insertion sort [7, 6, 5, 4, 3, 2, 1].
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using System;
class Program
{
static void Main()
{
int[] arr = { 7, 6, 5, 4, 3, 2, 1 };
Array.Sort(arr);
Console.WriteLine(string.Join(", ", arr));
}
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Insertion is O(n²)—implement manually in interviews.
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