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17 lines
386 B
Ruby
17 lines
386 B
Ruby
# Definition for a binary tree node.
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# class TreeNode
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# attr_accessor :val, :left, :right
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# def initialize(val)
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# @val = val
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# @left, @right = nil, nil
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# end
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# end
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#
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# @param {TreeNode} root
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# @return {TreeNode}
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def invert_binary_tree(root)
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root.right, root.left = invert_binary_tree(root.left), invert_binary_tree(root.right) unless root.nil?
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root
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end
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