feat(content): more test cases

backend/data/questions/word-search.yaml

@@ -10,6 +10,24 @@ patterns:
   - backtracking
   - dfs
 
+function_signature: "def exist(board: list[list[str]], word: str) -> bool:"
+
+test_cases:
+  visible:
+    - input: { board: [["A", "B", "C", "E"], ["S", "F", "C", "S"], ["A", "D", "E", "E"]], word: "ABCCED" }
+      expected: true
+    - input: { board: [["A", "B", "C", "E"], ["S", "F", "C", "S"], ["A", "D", "E", "E"]], word: "SEE" }
+      expected: true
+    - input: { board: [["A", "B", "C", "E"], ["S", "F", "C", "S"], ["A", "D", "E", "E"]], word: "ABCB" }
+      expected: false
+  hidden:
+    - input: { board: [["A"]], word: "A" }
+      expected: true
+    - input: { board: [["A", "B"], ["C", "D"]], word: "ABCD" }
+      expected: false
+    - input: { board: [["A", "B"], ["C", "D"]], word: "ABDC" }
+      expected: true
+
 description: |
   Given an `m × n` grid of characters `board` and a string `word`, return `true` if `word` exists in the grid.