feat(content): more test cases

backend/data/questions/largest-rectangle-in-histogram.yaml

@@ -9,6 +9,32 @@ categories:
 patterns:
   - monotonic-stack
 
+function_signature: "def largest_rectangle_area(heights: list[int]) -> int:"
+
+test_cases:
+  visible:
+    - input: { heights: [2, 1, 5, 6, 2, 3] }
+      expected: 10
+    - input: { heights: [2, 4] }
+      expected: 4
+    - input: { heights: [1, 1] }
+      expected: 2
+  hidden:
+    - input: { heights: [1] }
+      expected: 1
+    - input: { heights: [0] }
+      expected: 0
+    - input: { heights: [2, 1, 2] }
+      expected: 3
+    - input: { heights: [1, 2, 3, 4, 5] }
+      expected: 9
+    - input: { heights: [5, 4, 3, 2, 1] }
+      expected: 9
+    - input: { heights: [3, 6, 5, 7, 4, 8, 1, 0] }
+      expected: 20
+    - input: { heights: [4, 2, 0, 3, 2, 5] }
+      expected: 6
+
 description: |
   Given an array of integers `heights` representing the histogram's bar height where the width of each bar is `1`, return *the area of the largest rectangle in the histogram*.