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Grokking the Coding Interview Patterns

Solution: Total Appeal of a String

Discover how to compute the total appeal of a string by summing unique characters across all substrings. Learn to use hash maps to track character occurrences and efficiently calculate contributions without redundant counting. Understand an O(n) time and O(1) space complexity solution designed for coding interviews.

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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 ...