Created
August 23, 2012 21:35
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Subset Check
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| def is_subset?(a,b) | |
| return true if b and b.is_a? Array and b.empty? # O(1) | |
| hash = {} # O(1) | |
| a.each{|v| hash[v] = true} # O(n) outer, O(1) inner, O(n) total | |
| b.map{|v| hash[v] }.uniq == [true] # O(n) outer, O(1) inner, O(n) total | |
| end |
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