Grokking the Coding Interview: Patterns for Coding Questions
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Solution: Longest Substring with K Distinct Characters

Problem Statement

Given a string, find the length of the longest substring in it with no more than K distinct characters.

You can assume that K is less than or equal to the length of the given string.

Example 1:

Input: str="araaci", K=2  
Output: 4  
Explanation: The longest substring with no more than '2' distinct characters is "araa".

Example 2:

Input: str="araaci", K=1  
Output: 2  
Explanation: The longest substring with no more than '1' distinct characters is "aa".

Example 3:

Input: str="cbbebi", K=3  
Output: 5

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