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imouaddine/Rotate matrix by 90

Created November 10, 2014 14:41
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Rotate matrix by 90
def rotate_matrix(a, length)
(0).upto(length -1) do |i|
(i+1).upto(length -1) do |j|
a[i][j], a[j][i] = a[j][i], a[i][j]
end
end
a
end
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