feat(content): more test cases

backend/data/questions/permutations.yaml

@@ -9,6 +9,26 @@ categories:
 patterns:
   - backtracking
 
+function_signature: "def permute(nums: list[int]) -> list[list[int]]:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 2, 3] }
+      expected: [[1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1]]
+    - input: { nums: [0, 1] }
+      expected: [[0, 1], [1, 0]]
+    - input: { nums: [1] }
+      expected: [[1]]
+  hidden:
+    - input: { nums: [5, 4] }
+      expected: [[5, 4], [4, 5]]
+    - input: { nums: [-1, 0, 1] }
+      expected: [[-1, 0, 1], [-1, 1, 0], [0, -1, 1], [0, 1, -1], [1, -1, 0], [1, 0, -1]]
+    - input: { nums: [1, 2, 3, 4] }
+      expected: [[1, 2, 3, 4], [1, 2, 4, 3], [1, 3, 2, 4], [1, 3, 4, 2], [1, 4, 2, 3], [1, 4, 3, 2], [2, 1, 3, 4], [2, 1, 4, 3], [2, 3, 1, 4], [2, 3, 4, 1], [2, 4, 1, 3], [2, 4, 3, 1], [3, 1, 2, 4], [3, 1, 4, 2], [3, 2, 1, 4], [3, 2, 4, 1], [3, 4, 1, 2], [3, 4, 2, 1], [4, 1, 2, 3], [4, 1, 3, 2], [4, 2, 1, 3], [4, 2, 3, 1], [4, 3, 1, 2], [4, 3, 2, 1]]
+    - input: { nums: [0] }
+      expected: [[0]]
+
 description: |
   Given an array `nums` of distinct integers, return *all the possible permutations*. You can return the answer in **any order**.