feat(content): hidden test cases

backend/data/questions/building-boxes.yaml

@@ -10,6 +10,30 @@ patterns:
   - binary-search
   - greedy
 
+function_signature: "def minimum_boxes(n: int) -> int:"
+
+test_cases:
+  visible:
+    - input: { n: 3 }
+      expected: 3
+    - input: { n: 4 }
+      expected: 3
+    - input: { n: 10 }
+      expected: 6
+  hidden:
+    - input: { n: 1 }
+      expected: 1
+    - input: { n: 2 }
+      expected: 2
+    - input: { n: 5 }
+      expected: 4
+    - input: { n: 6 }
+      expected: 4
+    - input: { n: 7 }
+      expected: 5
+    - input: { n: 20 }
+      expected: 10
+
 description: |
   You have a cubic storeroom where the width, length, and height of the room are all equal to `n` units. You are asked to place `n` boxes in this room where each box is a cube of unit side length. There are however some rules to placing the boxes: