< Ace Coding /> 🚀
"""
You are given a string s consisting only of the letters 'a' and 'b', and an integer k.
What is the minimum number of characters you need to change to obtain a substring of length ≥ k where all characters are the same?
Example 1:
s = “aabaabaa”, k = 3
Output: 1
Explanation: s can be transformed to “aaaaabaa”
Example 2:
s = “bbabbaba”, k = 8
Output: 3
Explanation: s can be transformed to “bbbbbbbb”
Constraints:
1 <= s.length <= 10^5
1 <= k <= s.length
aaab, k = 4
aaaa
abs(3 - 1) = 2
"""
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