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Grokking the Coding Interview Patterns in Python

Solution: Total Appeal of a String

Understand how to calculate the total appeal of a string by efficiently tracking each character's contribution using hash maps. This lesson teaches how to count unique characters in substrings, optimize the solution, and implement it with O(n) time complexity.

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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 ...