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DescriptionQ049
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Q049FWASIC interview problem

Clean palindrome check

TechniquesStringTwo pointers
DifficultyEasy
TopicStrings
LanguageSystemVerilog
Requirements3 checkpoints
01

Problem

Return 1 when a string is a palindrome after ignoring punctuation and letter case. Only alphanumeric characters participate in the comparison.

Example input and output

Use this case to check your interpretation
Input
s = "A man, a plan, a canal: Panama!"
Output
1 (palindrome)
Explanation

Removing punctuation and folding case produces "amanaplanacanalpanama", which reads the same in both directions.

02

Requirements (3)

  • Skip non-alphanumeric bytes from both ends.
  • Compare letters case-insensitively.
  • Treat an empty cleaned string as a palindrome.