My Project Euler solutions
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You can quickly setup a new ruby file for any given problem if you have the nokogiri gem:
load 'common.rb'
#this will create a file like p100.rb and set it up with the problem description
setup_p 100 # or whatever number you like,
# this will try problem 100 and pass an arg of 123 to the p100 method
# it will copy the result to clipboard and time the execution
try_p 100, 123