feat(content): more test cases

backend/data/questions/top-k-frequent-elements.yaml

@@ -11,6 +11,24 @@ categories:
 patterns:
   - heap
 
+function_signature: "def top_k_frequent(nums: list[int], k: int) -> list[int]:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 1, 1, 2, 2, 3], k: 2 }
+      expected: [1, 2]
+    - input: { nums: [1], k: 1 }
+      expected: [1]
+    - input: { nums: [4, 1, -1, 2, -1, 2, 3], k: 2 }
+      expected: [-1, 2]
+  hidden:
+    - input: { nums: [1, 2], k: 2 }
+      expected: [1, 2]
+    - input: { nums: [5, 5, 5, 5, 5], k: 1 }
+      expected: [5]
+    - input: { nums: [1, 1, 2, 2, 3, 3, 4], k: 3 }
+      expected: [1, 2, 3]
+
 description: |
   Given an integer array `nums` and an integer `k`, return *the* `k` *most frequent elements*. You may return the answer in **any order**.