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Solution: Count Binary Substrings

Understand how to count non-empty binary substrings containing equal numbers of consecutive zeros and ones. Learn to track group sizes and calculate valid substrings efficiently using a linear scan approach that optimizes time and space complexity.

Statement

Given a binary string s, return the count of non-empty substrings that satisfy both of the following conditions:

  • The substring contains an equal number of '0's and '1's.

  • All '0's and all '1's within the substring are grouped consecutively (i.e., no interleaving of the two characters).

Substrings that appear multiple times are counted once for each occurrence.

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