feat(content): function signatures + test cases

backend/data/questions/contains-duplicate-ii.yaml

@@ -9,6 +9,30 @@ categories:
 patterns:
   - sliding-window
 
+function_signature: "def contains_nearby_duplicate(nums: list[int], k: int) -> bool:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 2, 3, 1], k: 3 }
+      expected: true
+    - input: { nums: [1, 0, 1, 1], k: 1 }
+      expected: true
+    - input: { nums: [1, 2, 3, 1, 2, 3], k: 2 }
+      expected: false
+  hidden:
+    - input: { nums: [1], k: 1 }
+      expected: false
+    - input: { nums: [1, 1], k: 0 }
+      expected: false
+    - input: { nums: [1, 2, 1], k: 2 }
+      expected: true
+    - input: { nums: [99, 99], k: 2 }
+      expected: true
+    - input: { nums: [1, 2, 3, 4, 5], k: 3 }
+      expected: false
+    - input: { nums: [0, 1, 2, 3, 4, 0, 0, 7, 8, 9, 10, 11, 12, 0], k: 1 }
+      expected: true
+
 description: |
   Given an integer array `nums` and an integer `k`, return `true` *if there are two **distinct indices*** `i` *and* `j` *in the array such that* `nums[i] == nums[j]` *and* `abs(i - j) <= k`.