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Grokking the Coding Interview Patterns in C#

Solution: Total Appeal of a String

Explore how to calculate the total appeal of a string by summing the unique characters across all its substrings. Understand the use of hash maps to track character occurrences efficiently and learn to implement an O(n) time complexity solution for this problem.

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Statement

Given a string s, return its total appeal, which is calculated by summing the appeals of all its substringsA substring is a contiguous sequence of characters within a string..

The appeal of a string is defined as the count of unique characters present in that string.

For instance, the appeal of “xyzxz” is 3 ...