using System.Collections.Generic;
 
public class EfficiencyDemo
{
    public void PreallocateList()
    {
        // Pre-allocate space for 1000 items to avoid resizing
        var data = new List<int>(1000);
        
        for (int i = 0; i < 1000; i++)
        {
            data.Add(i);
        }
    }
}