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Services/StepLogger.cs

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+using System.Text;
+
+namespace Lab9.Services;
+
+public class StepLogger
+{
+    private readonly StringBuilder _builder = new();
+
+    public void Header(string text)
+    {
+        _builder.AppendLine(text);
+    }
+
+    public void BlankLine()
+    {
+        _builder.AppendLine();
+    }
+
+    public void Line(string text)
+    {
+        _builder.AppendLine(text);
+    }
+
+    public void ArrayState(int[] array, params int[] highlightedIndices)
+    {
+        var highlighted = highlightedIndices.Length == 0
+            ? new HashSet<int>()
+            : highlightedIndices.ToHashSet();
+
+        var parts = new string[array.Length];
+        for (var i = 0; i < array.Length; i++)
+        {
+            parts[i] = highlighted.Contains(i) ? $"[{array[i]}]" : array[i].ToString();
+        }
+
+        _builder.AppendLine(string.Join(" ", parts));
+    }
+
+    public override string ToString() => _builder.ToString();
+}