Warship/Warship/DrawingObjectWarship.cs

@@ -39,5 +39,48 @@ namespace Warship
         public string GetInfo() => _warship?.GetDataForSave();
 
         public static IDrawingObject Create(string data) => new DrawingObjectWarship(data.CreateDrawingWarship());
+
+        public bool Equals(IDrawingObject? other)
+        {
+            if (other == null)
+                return false;
+
+            var otherWarship = other as DrawingObjectWarship;
+
+            if (otherWarship == null)
+                return false;
+
+            var warship = _warship.Warship;
+            var otherWarshipWarship = otherWarship._warship.Warship;
+
+            if (warship.GetType() != otherWarshipWarship.GetType())
+                return false;
+
+            if (warship.Speed != otherWarshipWarship.Speed)
+                return false;
+
+            if (warship.Weight != otherWarshipWarship.Weight)
+                return false;
+
+            if (warship.BodyColor != otherWarshipWarship.BodyColor)
+                return false;
+
+            if(warship is EntityAdvancedWarship adv && otherWarshipWarship is EntityAdvancedWarship otherAdv)
+            {
+                if (adv.DopColor != otherAdv.DopColor)
+                    return false;
+
+                if (adv.Antenna != otherAdv.Antenna)
+                    return false;
+
+                if (adv.Helipad != otherAdv.Helipad)
+                    return false;
+
+                if (adv.Missile != otherAdv.Missile)
+                    return false;
+            }
+
+            return true;
+        }
     }
 }

Warship/Warship/IDrawingObject.cs

@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Warship
 {
-    internal interface IDrawingObject
+    internal interface IDrawingObject : IEquatable<IDrawingObject>
     {
         public float Step { get; }
         void SetObject(int x, int y, int width, int height);

Warship/Warship/MapWithSetWarshipsGeneric.cs

@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 namespace Warship
 {
     internal class MapWithSetWarshipsGeneric<T,U>
-        where T : class, IDrawingObject
+        where T : class, IDrawingObject, IEquatable<T>
         where U : AbstractMap
     {
         private readonly int _pictureWidth;

Warship/Warship/SetWarshipsGeneric.cs

@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 namespace Warship
 {
     internal class SetWarshipsGeneric<T>
-        where T : class
+        where T : class, IEquatable<T>
     {
         private readonly List<T> _places;
 
@@ -25,15 +25,22 @@ namespace Warship
         {
             if (Count >= _maxCount)
                 throw new StorageOverflowException(_maxCount);
+
             _places.Insert(0, warship);
+
             return 0;
         }
         
         public int Insert(T warship, int position)
         {
+            if (_places.Contains(warship))
+                return -1;
+
             if (position >= _maxCount || position < 0)
                 throw new StorageOverflowException(_maxCount);
+
             _places.Insert(position, warship);
+
             return position;
         }