feat(content): function signatures + test cases

backend/data/questions/combination-sum-iv.yaml

@@ -9,6 +9,28 @@ categories:
 patterns:
   - dynamic-programming
 
+function_signature: "def combination_sum4(nums: list[int], target: int) -> int:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 2, 3], target: 4 }
+      expected: 7
+    - input: { nums: [9], target: 3 }
+      expected: 0
+  hidden:
+    - input: { nums: [1], target: 1 }
+      expected: 1
+    - input: { nums: [1, 2], target: 3 }
+      expected: 3
+    - input: { nums: [2, 3], target: 6 }
+      expected: 4
+    - input: { nums: [1, 2, 3], target: 5 }
+      expected: 13
+    - input: { nums: [3, 4, 5, 6], target: 10 }
+      expected: 18
+    - input: { nums: [5, 10], target: 15 }
+      expected: 3
+
 description: |
   Given an array of **distinct** integers `nums` and a target integer `target`, return *the number of possible combinations that add up to* `target`.