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Solution: Count Binary Substrings

Understand how to count non-empty substrings in a binary string that have equal numbers of consecutive zeros and ones. Learn to track groups of identical characters and apply the minimum group count to calculate valid substrings efficiently in a single pass.

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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