feat(content): more test cases

backend/data/questions/decode-string.yaml

@@ -10,6 +10,32 @@ categories:
 patterns:
   - monotonic-stack
 
+function_signature: "def decode_string(s: str) -> str:"
+
+test_cases:
+  visible:
+    - input: { s: "3[a]2[bc]" }
+      expected: "aaabcbc"
+    - input: { s: "3[a2[c]]" }
+      expected: "accaccacc"
+    - input: { s: "2[abc]3[cd]ef" }
+      expected: "abcabccdcdcdef"
+  hidden:
+    - input: { s: "abc" }
+      expected: "abc"
+    - input: { s: "10[a]" }
+      expected: "aaaaaaaaaa"
+    - input: { s: "2[2[2[b]]]" }
+      expected: "bbbbbbbb"
+    - input: { s: "1[ab]" }
+      expected: "ab"
+    - input: { s: "2[xy3[z]]" }
+      expected: "xyzzzxyzzz"
+    - input: { s: "2[a2[b]]" }
+      expected: "abbabb"
+    - input: { s: "100[x]" }
+      expected: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+
 description: |
   Given an encoded string, return its decoded string.