cryptomanic questions

• Frequency of each element of an array considering all contiguos subarrays
• Product of distinct prime numbers as a sum of perfect square
• Use of "list" in data.table's j argument
• How to find the lexicographically smallest string by reversing a substring?
• Modify functions in R using body, formals and environment methods
• Sum of all numbers written with particular digits in a given range
• What is the difference between flatten and ravel functions in numpy?

cryptomanic answers