feat(content): function signatures + test cases

backend/data/questions/add-minimum-number-of-rungs.yaml

@@ -8,6 +8,28 @@ categories:
 patterns:
   - greedy
 
+function_signature: "def add_rungs(rungs: list[int], dist: int) -> int:"
+
+test_cases:
+  visible:
+    - input: { rungs: [1, 3, 5, 10], dist: 2 }
+      expected: 2
+    - input: { rungs: [3, 6, 8, 10], dist: 3 }
+      expected: 0
+    - input: { rungs: [3, 4, 6, 7], dist: 2 }
+      expected: 1
+  hidden:
+    - input: { rungs: [5], dist: 10 }
+      expected: 0
+    - input: { rungs: [10], dist: 3 }
+      expected: 3
+    - input: { rungs: [1, 100], dist: 10 }
+      expected: 9
+    - input: { rungs: [1, 2, 3, 4, 5], dist: 1 }
+      expected: 0
+    - input: { rungs: [4, 8, 12, 16], dist: 3 }
+      expected: 4
+
 description: |
   You are given a **strictly increasing** integer array `rungs` that represents the **height** of rungs on a ladder. You are currently on the **floor** at height `0`, and you want to reach the last rung.