mikhail-putilov

class Solution {
    public int characterReplacement(String s, int k) {
        int windowStart = 0;
        int[] frequenciesInCurrentWindow = new int['A' + 26];
        int maxFrequencyOfDominantCharacterSoFar = 0;
        int kMinus1 = k - 1;
        for (int windowEnd = 0; windowEnd < s.length(); windowEnd++) {
            char rightChar = s.charAt(windowEnd);
            int rightCharFrequency = ++frequenciesInCurrentWindow[rightChar];