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Grokking the Coding Interview Patterns in C#

Solution: Total Appeal of a String

Explore an efficient method to calculate the total appeal of a string by focusing on each character's contribution using hash maps. Learn to track character occurrences, compute substring counts, and sum unique characters' impact. This lesson helps you implement an O(n) time complexity solution with constant space usage, reinforcing your understanding of hash maps in coding interviews.

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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 ...