feat(content): function signatures + test cases

backend/data/questions/best-time-to-buy-and-sell-stock-ii.yaml

@@ -9,6 +9,30 @@ categories:
 patterns:
   - greedy
 
+function_signature: "def max_profit(prices: list[int]) -> int:"
+
+test_cases:
+  visible:
+    - input: { prices: [7, 1, 5, 3, 6, 4] }
+      expected: 7
+    - input: { prices: [1, 2, 3, 4, 5] }
+      expected: 4
+    - input: { prices: [7, 6, 4, 3, 1] }
+      expected: 0
+  hidden:
+    - input: { prices: [1] }
+      expected: 0
+    - input: { prices: [2, 1] }
+      expected: 0
+    - input: { prices: [1, 2] }
+      expected: 1
+    - input: { prices: [3, 3, 3, 3] }
+      expected: 0
+    - input: { prices: [1, 2, 1, 2, 1, 2] }
+      expected: 3
+    - input: { prices: [5, 1, 3, 2, 8, 4, 9] }
+      expected: 14
+
 description: |
   You are given an integer array `prices` where `prices[i]` is the price of a given stock on the i<sup>th</sup> day.