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

Solution: Total Appeal of a String

Explore how to calculate the total appeal of a string by summing unique characters in its substrings. This lesson guides you through using hash maps to track character indices, enabling an efficient O(n) solution that avoids counting duplicates. Understand how to implement key-value operations for optimization and practice calculating contributions of each character to the total appeal.

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 ...