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Results tagged with combinatorics
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user 113648
Questions related to combinatorics and discrete mathematical structures
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Lexicographic permutation
Consider that you have a permutation of $n$ elements from $1$ to $n$ and you need to sort the elements lexicographical . for example sorted permutation for $n=11$ is $1,10,11,2,3,4,5,6,7,8,9$ .Now con …
- 47
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Counting strings with balanced substrings
Consider a string of characters $a, b, c$ only. Such a string is called good if the number of $a$'s + number of $b$'s is equal to the number of $c$'s.
Given an integer $n$, find the number of strings …
- 47