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I think there is a bit more intuitive solution without map for this problem

Courses
,
#1

Something like this:

public static int findLength(String str, int k) {        
    if(str == null || str.isEmpty() || k <= 0) {
      return -1;
    }

    int res = 0;
    int start = 0;
    int end = 0;
    int skip = k;
    while(start <= end && end < str.length()) {
      if(str.charAt(start) == str.charAt(end) || skip > 0) {
        if(str.charAt(start) != str.charAt(end)) {
          skip--;
        }        
        end++;
      }
      else {        
        res = Math.max(res, end - start);
        skip++;
        start++;
      }
    }

    return Math.max(res, end - start);
  }

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Course: https://www.educative.io/collection/5668639101419520/5671464854355968
Lesson: https://www.educative.io/collection/page/5668639101419520/5671464854355968/6497958910492672