feat(content): function signatures + test cases

backend/data/questions/check-if-the-sentence-is-pangram.yaml

@@ -9,6 +9,28 @@ categories:
 patterns:
   - prefix-sum
 
+function_signature: "def check_if_pangram(sentence: str) -> bool:"
+
+test_cases:
+  visible:
+    - input: { sentence: "thequickbrownfoxjumpsoverthelazydog" }
+      expected: true
+    - input: { sentence: "leetcode" }
+      expected: false
+  hidden:
+    - input: { sentence: "abcdefghijklmnopqrstuvwxyz" }
+      expected: true
+    - input: { sentence: "a" }
+      expected: false
+    - input: { sentence: "abcdefghijklmnopqrstuvwxy" }
+      expected: false
+    - input: { sentence: "aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz" }
+      expected: true
+    - input: { sentence: "zyxwvutsrqponmlkjihgfedcba" }
+      expected: true
+    - input: { sentence: "qwertyuiopasdfghjklzxcvbnm" }
+      expected: true
+
 description: |
   A **pangram** is a sentence where every letter of the English alphabet appears at least once.