You are given a string word and an integer k.
A substring s of word is complete if:
s occurs exactly k times.2. That is, for any two adjacent characters c1 and c2 in s, the absolute difference in their positions in the alphabet is at most 2.Return the number of complete substrings of word.
A substring is a non-empty contiguous sequence of characters in a string.
\n\n\n
Example 1:
\n\n\nInput: word = "igigee", k = 2\nOutput: 3\nExplanation: The complete substrings where each character appears exactly twice and the difference between adjacent characters is at most 2 are: igigee, igigee, igigee.\n\n\n
Example 2:
\n\n\nInput: word = "aaabbbccc", k = 3\nOutput: 6\nExplanation: The complete substrings where each character appears exactly three times and the difference between adjacent characters is at most 2 are: aaabbbccc, aaabbbccc, aaabbbccc, aaabbbccc, aaabbbccc, aaabbbccc.\n\n\n
\n
Constraints:
\n\n1 <= word.length <= 105word consists only of lowercase English letters.1 <= k <= word.lengthk *1, k * 2, … k * 26.****",
"For each length, we can use sliding window to count the frequency of each letter in the window.",
"We still need to check for all characters in the window that abs(word[i] - word[i - 1]) <= 2. We do this by maintaining the values of abs(word[i] - word[i - 1]) in the sliding window dynamically in an ordered multiset or priority queue, so that we know the maximum value at each iteration."
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