離散数学読書会（＠2012-02-12）

1_50.rb

def myset(a1, a2)
    h = Hash.new(0)
    a1.each{|a| h[a] += 1}
    a2.each{|a| h[a] += 1}
    
    puts "a and b"
    p h.select{|k, v| v == 2}.keys

    puts "a or b"
    p h.keys

    puts "a - b"
    p a1.select{|a| h[a] == 1}
end

myset([1, 3, -5, 8, -4], [7, -4, 2, 3, 8, -6, 5])
myset([1, 3, -5, 8, -4], [7, -2, 3, 2, -6, 9, -4])