Added second test for duplicates

Author: xurten

CodingInterview/CodingInterview/Tests.cs

@@ -16,6 +16,27 @@ int[] RemoveDuplicates(int[] arrayOfNumbers)
  return numbers.ToArray();
  }
 
+ int[] LeaveTwoDuplicates(int[] arrayOfNumbers)
+ {
+ var numbers = new HashSet<int>();
+ var numbersWithTwoDuplicates = new List<int>();
+ for (int index = 0; index < arrayOfNumbers.Length; index++)
+ {
+ numbers.Add(arrayOfNumbers[index]);
+ }
+
+ for (int index = 0; index < numbers.Count; index++)
+ { 
+ var actualValue = numbers.ElementAt(index);
+ if (arrayOfNumbers.Where(element => element == actualValue).Count() >= 2)
+ {
+ numbersWithTwoDuplicates.Add(actualValue);
+ }
+ numbersWithTwoDuplicates.Add(actualValue);
+ }
+ return numbersWithTwoDuplicates.ToArray();
+ }
+
  [Test]
  public void RemoveDuplicatesFromSortedArray_1()
  {
@@ -26,5 +47,16 @@ public void RemoveDuplicatesFromSortedArray_1()
 
  Assert.AreEqual(expectedSortedArrayWithoutDuplicates, sortedArrayWithoutDuplicatesCalculated);
  }
+
+ [Test]
+ public void RemoveDuplicatesFromSortedArray_2()
+ {
+ var sortedArrayWithDuplicates = new int[] { 1, 3, 3, 3, 6, 8, 8, 9, 9, 9 };
+ var expectedSortedArrayWithTwoDuplicates = new int[] { 1, 3, 3, 6, 8, 8, 9, 9 };
+
+ var sortedArrayWithTwoDuplicatesCalculated = LeaveTwoDuplicates(sortedArrayWithDuplicates);
+
+ Assert.AreEqual(expectedSortedArrayWithTwoDuplicates, sortedArrayWithTwoDuplicatesCalculated);
+ }
  }
 }