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23 lines
589 B
Ruby
23 lines
589 B
Ruby
# Given a binary tree, return all root-to-leaf paths.
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#
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# 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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# @param {TreeNode} root
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# @return {String[]}
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def root_to_leaf_paths(root, current_path)
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paths = []
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paths << root.left.nil? ? current_path : root_to_leaf_paths(root.left, current_path + "->#{root.left.val}")
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paths << root.right.nil? ? current_path : root_to_leaf_paths(root.right, current_path + "->#{root.right.val}")
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paths
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end
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