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Grokking the Coding Interview Patterns in JavaScript

Solution: Total Appeal of a String

Understand how to calculate the total appeal of a string by summing unique character counts in all substrings. Explore using hash maps to track last occurrences, enabling efficient computation in linear time and constant space, and grasp the method through illustrative examples.

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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 ...