it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
Solve the set of simultaneous linear equations
We love vectorized solutions. Problem 1 : remove the row average.
Insert zeros into vector
Find the definite integral of various linear functions
Center of mass
Bridge and Torch Problem - Minimum time
Check if the input is a strong prime
String permutations on phone keyboard
Repeat string n times
Create initial basic feasible solution for transportation problems -Minimum Cost Method
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