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Given a binary tree, find its minimum depth.
给定一棵二叉树，计算其最小深度。
youdao
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The minimum reflection time section can be directly converted into depth section.
极小值时间剖面可直接作时深转换。
youdao
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The minimum reflection time section can be directly converted into depth section.
极小值时间剖面可直接作时深转换。
youdao