Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns in Python

Solution: Total Appeal of a String

Explore how to calculate the total appeal of a string, defined as the sum of unique characters in all substrings, by leveraging hash maps. Learn to track character occurrences to optimize the solution with O(n) time and constant space complexity. This lesson guides you in applying hash map logic to solve substring uniqueness problems effectively.

We'll cover the following...

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 ...