Second Largest String

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Problem

How would you write a program to find the second largest string? Treat strings as distinct by their casefold() values and compare them lexicographically without regard to case; preserve the first spelling encountered for the returned value. Implement second_largest_string(strings), which accepts a list of strings and returns the second-largest distinct string, or None when fewer than two case-insensitive values exist.

Constraints

1 <= len(strings) <= 10^4
Each element is a non-empty Python string
Comparison is lexicographic on each string's casefolded value
Case-insensitive duplicates count as one distinct value
Return None when fewer than two distinct casefolded values exist

Function Signature

def second_largest_string(strings):

Your solutionPython 3

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