Iterate SortedDictionary keys in order.
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using System;
class Program
{
static void Main()
{
using System.Collections.Generic;
var map = new SortedDictionary<string, int> { ["b"] = 2, ["a"] = 1 };
Console.WriteLine(string.Join(",", map.Keys));
}
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SortedDictionary keeps keys sorted—O(log n) operations.
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