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Grokking the Coding Interview Patterns in JavaScript

Solution: Total Appeal of a String

Understand how to compute the total appeal of a string by summing the count of unique characters in all its substrings. This lesson teaches an efficient hash map approach to track character occurrences and calculate contributions, helping you solve related coding interview problems with linear 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 ...