Minimum Substrings Without Repeating Characters

Problem Overview

• Partition string S into the fewest substrings where each has no repeating characters; return that minimum count.
• Input: string S; Output: integer minimum number of such substrings; Constraints: N/A.
• Domain: text processing or streaming, where segments must keep unique characters per chunk.
• This problem comes from Microsoft interviews and is a common coding interview interview question.