FastPrepValid Palindrome After Normalization
Problem · String

Valid Palindrome After Normalization

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Problem statement

Given a string s, determine whether its letters and digits form a palindrome when letter case is ignored.

Normalize the string conceptually using these rules:

The problem statement continues
Pro

Examples

Example 1

s = "A!b?b,a"return = true

Filtering punctuation and folding case gives abba, whose two outer pairs match.

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FastPrep Pro
Reported in 1 Amazon interview this week

Unlock this recently reported problem

FastPrep Pro gives you full access to interview problems reported within the last week.

  • Full problem statement and constraints
  • 1 more worked example, explained
  • Guided hints and editorial
  • Run your code on real test cases
$8.25/month

$99 billed yearly — or $19 month-to-month. Cancel anytime.

Free plan — 2 of 2 free unlocks used this week