I've added a Skip(int count) method to the IntSet class. This method provides an IEnumerable<int> that leaves out the initial count elements from the set (when considering them in their natural ascending order) and then provides the rest.

To do this, I made use of the existing `GetElementsInRange` method:
- If `count` is zero or less, all elements are given back.
- If `count` is the same as or larger than the total number of elements, you'll get an empty list.
- In other cases, I find the element at the `count`-th spot and then use `GetElementsInRange` to give you all the elements that come after it, including the one at the `count`-th position.

I've also put thorough unit tests into `IntSetTests.cs` to check many different situations, such as:
- Empty sets.
- When `count` is zero, negative, the same as the set size, or bigger than the set size.
- Skipping some elements in both small and large sets.
- Sets that include positive numbers, negative numbers, and zero.
These tests confirm that the elements are correct and are in ascending order.

Author: google-labs-jules[bot]

src/IntSet.Tests/IntSetTests.cs

@@ -605,5 +605,56 @@ public void GetElementsInRange_DeepTraversal()
         }
 
         #endregion
+
+        #region Skip Tests
+
+        [Theory]
+        [InlineData(new int[] { }, 0, new int[] { })]
+        [InlineData(new int[] { }, 1, new int[] { })]
+        [InlineData(new int[] { }, -1, new int[] { })]
+        [InlineData(new[] { 1, 2, 3 }, 0, new[] { 1, 2, 3 })]
+        [InlineData(new[] { 1, 2, 3 }, -2, new[] { 1, 2, 3 })] // Negative count should be like 0
+        [InlineData(new[] { 1, 2, 3 }, 1, new[] { 2, 3 })]
+        [InlineData(new[] { 1, 2, 3 }, 2, new[] { 3 })]
+        [InlineData(new[] { 1, 2, 3 }, 3, new int[] { })] // Count equals length
+        [InlineData(new[] { 1, 2, 3 }, 4, new int[] { })] // Count greater than length
+        [InlineData(new[] { -5, -2, 0, 3, 7 }, 0, new[] { -5, -2, 0, 3, 7 })]
+        [InlineData(new[] { -5, -2, 0, 3, 7 }, 2, new[] { 0, 3, 7 })]
+        [InlineData(new[] { -5, -2, 0, 3, 7 }, 4, new[] { 7 })]
+        [InlineData(new[] { -5, -2, 0, 3, 7 }, 5, new int[] { })]
+        [InlineData(new[] { -5, -2, 0, 3, 7 }, 6, new int[] { })]
+        [InlineData(new[] { -5, -2, 0, 3, 7 }, -5, new[] { -5, -2, 0, 3, 7 })]
+        public void Skip_VariousScenarios(int[] setData, int count, int[] expectedData)
+        {
+            // Arrange
+            var set = new Kibnet.IntSet(setData);
+            var expected = expectedData.ToList();
+
+            // Act
+            var actual = set.Skip(count).ToList();
+
+            // Assert
+            Assert.Equal(expected, actual); // Assert.Equal on lists checks order and content
+        }
+
+        [Fact]
+        public void Skip_LargeSet_ReturnsCorrectSubsetsAndOrder()
+        {
+            // Arrange
+            var largeSetData = Enumerable.Range(0, 1000).ToArray(); // Creates {0, 1, ..., 999}
+            var set = new Kibnet.IntSet(largeSetData);
+
+            // Act & Assert
+            // Compare with LINQ's Skip behavior
+            Assert.Equal(largeSetData.Skip(0).ToList(), set.Skip(0).ToList());
+            Assert.Equal(largeSetData.Skip(100).ToList(), set.Skip(100).ToList());
+            Assert.Equal(largeSetData.Skip(500).ToList(), set.Skip(500).ToList());
+            Assert.Equal(largeSetData.Skip(999).ToList(), set.Skip(999).ToList());
+            Assert.Equal(largeSetData.Skip(1000).ToList(), set.Skip(1000).ToList()); // Should be empty
+            Assert.Equal(largeSetData.Skip(1001).ToList(), set.Skip(1001).ToList()); // Should be empty
+            Assert.Equal(largeSetData.Skip(-10).ToList(), set.Skip(-10).ToList()); // Negative, should return all
+        }
+
+        #endregion
     }
 }

src/IntSet/IntSet.cs

@@ -916,6 +916,56 @@ public IEnumerable<int> GetElementsInRange(int firstElement, int lastElement)
             }
         }
 
+        /// <summary>
+        /// Skips a specified number of elements in a sequence and then returns the remaining elements.
+        /// </summary>
+        /// <param name="count">The number of elements to skip before returning the remaining elements.</param>
+        /// <returns>An <see cref="IEnumerable{T}"/> that contains the elements that occur after the specified index in the input sequence.</returns>
+        public IEnumerable<int> Skip(int count)
+        {
+            if (count <= 0)
+            {
+                // Return all elements in ascending order
+                foreach (var item in this)
+                {
+                    yield return item;
+                }
+                yield break;
+            }
+
+            if (count >= this.LongCount)
+            {
+                // Return empty if count is too large
+                yield break;
+            }
+
+            int? elementToStartFrom = null;
+            long elementsSkipped = 0; // Use long to match LongCount
+
+            // Iterate to find the (count)-th element (0-indexed).
+            // This element is the first one to be included.
+            foreach (var item in this) // 'this' iterates in ascending order
+            {
+                if (elementsSkipped == count)
+                {
+                    elementToStartFrom = item;
+                    break;
+                }
+                elementsSkipped++;
+            }
+
+            if (elementToStartFrom.HasValue)
+            {
+                // GetElementsInRange is inclusive of its first parameter.
+                foreach (var itemInRange in GetElementsInRange(elementToStartFrom.Value, int.MaxValue))
+                {
+                    yield return itemInRange;
+                }
+            }
+            // If elementToStartFrom is null (e.g., if count == LongCount, though caught earlier),
+            // this correctly yields nothing.
+        }
+
         private static (int Min, int Max) GetBlockRange(int i0 = -1, int i1 = -1, int i2 = -1, int i3 = -1)
         {
             int minBase = 0;