feat(content): function signatures + test cases

backend/data/questions/concatenation-of-array.yaml

@@ -8,6 +8,26 @@ categories:
 patterns:
   - two-pointers
 
+function_signature: "def get_concatenation(nums: list[int]) -> list[int]:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 2, 1] }
+      expected: [1, 2, 1, 1, 2, 1]
+    - input: { nums: [1, 3, 2, 1] }
+      expected: [1, 3, 2, 1, 1, 3, 2, 1]
+  hidden:
+    - input: { nums: [1] }
+      expected: [1, 1]
+    - input: { nums: [5, 4, 3, 2, 1] }
+      expected: [5, 4, 3, 2, 1, 5, 4, 3, 2, 1]
+    - input: { nums: [1, 1, 1] }
+      expected: [1, 1, 1, 1, 1, 1]
+    - input: { nums: [7] }
+      expected: [7, 7]
+    - input: { nums: [100, 200] }
+      expected: [100, 200, 100, 200]
+
 description: |
   Given an integer array `nums` of length `n`, you want to create an array `ans` of length `2n` where `ans[i] == nums[i]` and `ans[i + n] == nums[i]` for `0 <= i < n` (**0-indexed**).