a = [1,4,1]
total = []
a.each do |num|
total << a.select {|x| x != num}
end
p total => [[4], [1, 1], [4]]
a = [1,4,1]
total = []
a.each do |num|
total
阅读背景：
在数组中选择除当前之外的所有元素
来源：互联网
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