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题目：Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the d... 阅读全文
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题目：Given an array where elements are sorted in ascending order, convert it to a height balanced BST.题解：先复习下什么是二叉搜索树（引自Wikipedia）：二叉查找树（Binary Search ... 阅读全文
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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 neares... 阅读全文
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题目：Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthes... 阅读全文
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题目：Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tree is symmetric: 1 /... 阅读全文