Solution: Total Appeal of a String
Understand how to calculate the total appeal of a string by summing unique characters in all substrings. This lesson teaches you to use hash maps to track character occurrences, enabling an efficient O(n) solution with constant space. Explore how to derive the contribution of each character to the total appeal without enumerating all substrings.
We'll cover the following...
We'll cover the following...
Statement
Given a string s, return its total appeal, which is calculated by summing the appeals of all its
The appeal of a string is defined as the count of unique characters present in that string.
For instance, the appeal of “xyzxz” is