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https://leetcode.com/problems/count-good-numbers/description/


Count (0,2,4,6,8)(2,3,5,7) generated strings of length n #medium #math
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# 17.06.2025
[3405. Count the Number of Arrays with K Matching Adjacent Elements](https://leetcode.com/problems/count-the-number-of-arrays-with-k-matching-adjacent-elements/description/) hard


Combinations k equal siblings 1..m in [n] array #hard #combinatorics #math
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