Leetcode 424 Solution

This article provides solution to leetcode question 424 (longest-repeating-character-replacement)
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https://leetcode.com/problems/longest-repeating-character-replacement

Solution

class Solution:
    def characterReplacement(self, s: str, k: int) -> int:
        l = 0
        r = 0
        opt = 0
        best = 0



        m = collections.defaultdict(int)



        while r < len(s):
            m[s[r]] += 1



            best = max(best, m[s[r]])



            while r - l + 1 > best + k:
                m[s[l]] -= 1
                l += 1



            opt = max(opt, r - l + 1)
            r += 1



        return opt