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Solution: Count Substrings with Only One Distinct Letter

Understand how to calculate the total number of substrings containing only one distinct letter in a given string. Explore a mathematical approach that uses run length tracking to solve the problem in a single pass with O(n) time and O(1) space complexity.

Statement

Given a string s, return the total number of substrings that contain only one distinct letter.

Constraints:

  • 1 ...