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Grokking the Coding Interview Patterns in C++

Solution: Total Appeal of a String

Understand how to calculate the total appeal of a string by focusing on each character's contribution using hash maps. This lesson helps you efficiently find the count of unique characters across all substrings with a time complexity of O(n) by tracking last occurrences and avoiding repeated counts.

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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 ...