How should I practice Lexicographically Smallest Palindrome Possible 🍊?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Amazon online assessment problems in FastPrep.

Is Lexicographically Smallest Palindrome Possible 🍊 associated with Amazon?

FastPrep tags this as a Amazon online assessment coding practice problem when the problem catalog has that company and stage context.

Lexicographically Smallest Palindrome Possible 🍊

Amazon● MediumOA

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Problem statement

Given a String, return the lexicographically smallest palindrome possible or -1.

Function

getSmallestPalindrome(s: String) → String

Examples

Example 1

s = "a?rt???"return = "aartraa"

Question marks can be replaced by a, r, a, a and we can make it palindrome.

Example 2

s = "bx??tm"return = "-1"

No character can be added to make it a palindrome.

Example 3

s = "ai?a??u"return = "aaiuiaa"

'?' is replaced by a, a and i and characters are rearranged to make it a palindrome.

Constraints

A mysterious untelling for now 🧐 As always, will add once find out