20 lines
436 B
Ruby
20 lines
436 B
Ruby
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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} treeNode
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# @return {Integer}
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def minimum_depth_of_binary_tree(tree_node)
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if tree_node.nil?
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0
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else
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1 + [minimum_depth_of_binary_tree(tree_node.left), minimum_depth_of_binary_tree(tree_node.right)].min
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end
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end
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