Given a string s, partition it into the maximum number of contiguous substrings such that every substring starts with a distinct character.

Return the maximum number of substrings that can be obtained from such a partition.

Constraints:

• $1 \leq$ s.length $\leq 10^5$

• s consists of lowercase English letters.

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We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.