Solve LeetCode #90 'Subsets II' [Medium].

eminencegrs · Dec 11, 2024 · 2c81f6d · 2c81f6d
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diff --git a/LeetCode/src/LeetCode.Challenges/Problems00xx/N_0090_SubsetsII/Solution.cs b/LeetCode/src/LeetCode.Challenges/Problems00xx/N_0090_SubsetsII/Solution.cs
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+namespace LeetCode.Challenges.Problems00xx.N_0090_SubsetsII;
+
+public static class Solution
+{
+    public static IList<IList<int>> Subsets(int[] numbers)
+    {
+        var result = new List<IList<int>>();
+        Dfs(0, []);
+        return result;
+
+        void Dfs(int index, IList<int> subset)
+        {
+            if (index == numbers.Length)
+            {
+                result.Add(new List<int>(subset));
+                return;
+            }
+
+            subset.Add(numbers[index]);
+            Dfs(index + 1, subset);
+
+            subset.RemoveAt(subset.Count - 1);
+
+            while (index + 1 < numbers.Length && numbers[index] == numbers[index + 1])
+            {
+                index++;
+            }
+
+            Dfs(index + 1, subset);
+        }
+    }
+}
diff --git a/LeetCode/tests/LeetCode.Challenges.UnitTests/Problems00xx/N_0090_SubsetsII/SolutionTests.cs b/LeetCode/tests/LeetCode.Challenges.UnitTests/Problems00xx/N_0090_SubsetsII/SolutionTests.cs
@@ -0,0 +1,101 @@
+using FluentAssertions;
+using LeetCode.Challenges.Problems00xx.N_0090_SubsetsII;
+using Xunit;
+
+namespace LeetCode.Challenges.UnitTests.Problems00xx.N_0090_SubsetsII;
+
+public class SolutionTests
+{
+    [Theory]
+    [MemberData(nameof(TestData))]
+    public void GivenNumbers_WhenSubsets_ThenResultAsExpected(int[] numbers, IList<IList<int>> expectedResult)
+    {
+        Solution.Subsets(numbers).Should().BeEquivalentTo(expectedResult);
+    }
+
+    public static IEnumerable<object[]> TestData()
+    {
+        yield return
+        [
+            new[] { 0 },
+            new List<IList<int>>
+            {
+                new List<int> { 0 },
+                new List<int>()
+            }
+        ];
+
+        yield return
+        [
+            new[] { 1, 1 },
+            new List<IList<int>>
+            {
+                new List<int> { 1, 1 },
+                new List<int> { 1 },
+                new List<int>()
+            }
+        ];
+
+        yield return
+        [
+            new[] { 1, 2 },
+            new List<IList<int>>
+            {
+                new List<int> { 1, 2 },
+                new List<int> { 1 },
+                new List<int> { 2 },
+                new List<int>()
+            }
+        ];
+
+        yield return
+        [
+            new[] { 1, 2, 2 },
+            new List<IList<int>>
+            {
+                new List<int> { 1, 2, 2 },
+                new List<int> { 1, 2 },
+                new List<int> { 1 },
+                new List<int> { 2, 2 },
+                new List<int> { 2 },
+                new List<int>()
+            }
+        ];
+
+        yield return
+        [
+            new[] { 1, 2, 3 },
+            new List<IList<int>>
+            {
+                new List<int> { 1, 2, 3 },
+                new List<int> { 1, 2 },
+                new List<int> { 1, 3 },
+                new List<int> { 1 },
+                new List<int> { 2, 3 },
+                new List<int> { 2 },
+                new List<int> { 3 },
+                new List<int>()
+            }
+        ];
+
+        yield return
+        [
+            new[] { 1, 2, 2, 3 },
+            new List<IList<int>>
+            {
+                new List<int> { 1, 2, 2, 3 },
+                new List<int> { 1, 2, 2 },
+                new List<int> { 1, 2, 3 },
+                new List<int> { 1, 2 },
+                new List<int> { 1, 3 },
+                new List<int> { 1 },
+                new List<int> { 2, 2, 3 },
+                new List<int> { 2, 2 },
+                new List<int> { 2, 3 },
+                new List<int> { 2 },
+                new List<int> { 3 },
+                new List<int>()
+            }
+        ];
+    }
+}