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->a{a.size.times{|i|j=rand*|i|j=rand(i+1);a[i],a[j]=a[j],a[i]};p a}
f.([1,2,3,4,5])
[2, 1, 4, 3, 5]
->a{a.size.times{|i|j=rand*(i+1);a[i],a[j]=a[j],a[i]};p a}
->a{a.size.times{|i|j=rand(i+1);a[i],a[j]=a[j],a[i]};p a}
a=gets.split.map(&:to_i) ->a{a.size.times{|i|j=rand*(i+1);a[i],a[j]=a[j],a[i]} p;p a}
1 f.([1,2 ,3 ,4 5,5])
a=gets.split.map(&:to_i) a.size.times{|i|j=rand*(i+1);a[i],a[j]=a[j],a[i]} p a
1 2 3 4 5
a=gets.split.map(&:to_i) (0...a.size).eachtimes{|i|j=rand*(i+1);a[i],a[j]=a[j],a[i]} p a
a=gets.split.map(&:to_i) (0...a.size).each{|i|j=rand*(i+1);a[i],a[j]=a[j],a[i]} p a
