feat(content): function signatures + test cases

backend/data/questions/car-fleet.yaml

@@ -10,6 +10,30 @@ categories:
 patterns:
   - monotonic-stack
 
+function_signature: "def car_fleet(target: int, position: list[int], speed: list[int]) -> int:"
+
+test_cases:
+  visible:
+    - input: { target: 12, position: [10, 8, 0, 5, 3], speed: [2, 4, 1, 1, 3] }
+      expected: 3
+    - input: { target: 10, position: [3], speed: [3] }
+      expected: 1
+    - input: { target: 100, position: [0, 2, 4], speed: [4, 2, 1] }
+      expected: 1
+  hidden:
+    - input: { target: 10, position: [], speed: [] }
+      expected: 0
+    - input: { target: 10, position: [0, 5], speed: [1, 1] }
+      expected: 2
+    - input: { target: 10, position: [6, 8], speed: [3, 2] }
+      expected: 2
+    - input: { target: 10, position: [2, 4], speed: [3, 2] }
+      expected: 1
+    - input: { target: 100, position: [0, 50, 99], speed: [1, 1, 1] }
+      expected: 3
+    - input: { target: 20, position: [0, 10], speed: [10, 5] }
+      expected: 1
+
 description: |
   There are `n` cars at given miles away from the starting mile `0`, travelling to reach the mile `target`.