文章目录 一、题目二、题解 一、题目
Given an array of integers arr, return true if and only if it is a valid mountain array.
Recall that arr is a mountain array if and only if:
arr.length > 3 There exists some i with 0 < i < arr.length - 1 such …
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文章目录 一、题目二、题解 一、题目
Given a binary tree, find its minimum depth.
The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.
Note: A leaf is a node with no children.
Example 1:
Inpu…