seattle.rb may challenge - thagomizer.com · to participate • friend me! •...
TRANSCRIPT
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Who can do the most Project Euler
problems in a month?
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Project Euler
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Contest Rules
• May 7th 12:00 PM - June 3rd 12:00 PM!
• Language agnostic!
• Solution must take less than a minute!
• Don't use other people's code
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Prizes!
• $50 prize for most problems completed!
• Two divisions!
• Novice (< 1 year programming)!
• Open (everyone) !
• No prizes if < 10 people participate
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To participate
• Friend me!
• 73029928140835_45edcb4f778c358b11fc8589e912f0a9!
• Or send me an email of your friend code!
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Why Participate?
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Learn Ruby
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Prepare For Interviews
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Be Active In Seattle.rb
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Example Problem
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Euler #1
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"If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.!
!
"Find the sum of all the multiples of 3 or 5 below 1000.
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Example Solutions
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Solution 1sum = 0 (1...1_000).to_a.each do |n| if n % 5 == 0 then sum += n elsif n % 3 == 0 then sum += n end end p sum
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233168
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Solution 2nums = (1...1000).find_all { |x| x % 5 == 0 || x % 3 == 0 } ans = nums.inject(0) { |sum, n| sum += n } p ans
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233168
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Solution 3
nums = (1...1000).find_all { |x| x % 5 == 0 || x % 3 == 0 } p nums.inject(&:+)
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233168
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Solution 4
threes = (1..1000).select {|x| x%3 == 0} fives = (1..1000).select {|x| x%5 == 0} fifteens = (1..1000).select {|x| x%15 == 0} (threes + fives - fifteens).inject(:+)
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233168
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Solution 5
p 1000.times.find_all{ |x| x % 5 == 0 || x % 3 == 0 }.inject(&:+)
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233168
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Some Useful Ruby
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Numbery Stuff
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%
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> 5 % 2 1 !
!
> 321 % 3 0
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**
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> 5 ** 2 25 !
> 3 ** 3 27
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^
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> 5 ^ 2 7 !
> 3 ^ 3 0
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Prime
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times
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_
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> 1_000 > 1000 !
> 2_000_000_000 > 2000000000
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Stringy Stuff
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Reverse
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> "Hello".reverse "olleH"
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split
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> "Hello".split('') ["H", "e", "l", "l", "o"] !
> "Apple,Pear,Banana".split(',') ["Apples", "Pear", "Banana"]
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Enumerable
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find_all
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> (1..10).find_all { |x| x < 5 } [1, 2, 3, 4]
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inject
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> (0..10).inject {|s, n| s += n} 55 !
> (0..10).inject :+ 55
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downto upto
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> 3.downto(1) { |x| puts x } 3 2 1 !
> 3.upto(6) { |x| puts x } 3 4 5 6
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each_cons
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>(1..5).each_cons(3) { |a| p a } [1, 2, 3] [2, 3, 4] [3, 4, 5]
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map
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> [1, 2, 3].map { |x| x * 10 } [10, 20, 30]
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Other stuff
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Ranges
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> (1..3).max 3 !
> (1...3).max 2
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Re-opening Classes
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Timing
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$ time ruby my_script.rb !
real 0m0.118s user 0m0.062s sys 0m0.056s