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Grokking the Coding Interview Patterns

Solution: Total Appeal of a String

Understand how to calculate the total appeal of a string by efficiently tracking unique characters using hash maps. This lesson helps you apply a method that counts character contributions across substrings and implements an O(n) time complexity solution to solve coding interview problems effectively.

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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 33, as it contains three distinct characters: ‘x’, ‘y’, and ‘z’.

Constraints:

  • 1≤1 \leq s.length ≤103\leq 10^3 ...