Get the area codes from a list of phone numbers
Find a subset that divides the vector into equal halves
Longest run of consecutive numbers
Implement simple rotation cypher
Given a matrix, swap the 2nd & 3rd columns
Construct the Seidel-Entringer-Arnold triangle
Solve a ballot counting problem
Deduce the pattern behind the sequence
Solve an ODE: equation for a 2D laminar jet
Compute home primes in a given base
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