feat(content): hidden test cases

backend/data/questions/build-a-matrix-with-conditions.yaml

@@ -9,6 +9,22 @@ categories:
 patterns:
   - topological-sort
 
+function_signature: "def build_matrix(k: int, row_conditions: list[list[int]], col_conditions: list[list[int]]) -> list[list[int]]:"
+
+test_cases:
+  visible:
+    - input: { k: 3, row_conditions: [[1, 2], [3, 2]], col_conditions: [[2, 1], [3, 2]] }
+      expected: [[3, 0, 0], [0, 0, 1], [0, 2, 0]]
+    - input: { k: 3, row_conditions: [[1, 2], [2, 3], [3, 1], [2, 3]], col_conditions: [[2, 1]] }
+      expected: []
+  hidden:
+    - input: { k: 2, row_conditions: [[1, 2]], col_conditions: [[1, 2]] }
+      expected: [[1, 0], [0, 2]]
+    - input: { k: 2, row_conditions: [[1, 2]], col_conditions: [[2, 1]] }
+      expected: [[0, 1], [2, 0]]
+    - input: { k: 2, row_conditions: [[1, 2], [2, 1]], col_conditions: [[1, 2]] }
+      expected: []
+
 description: |
   You are given a **positive** integer `k`. You are also given: