题目:
You need to construct a binary tree from a string consisting of parenthesis and integers.
The whole input represents a binary tree. It contains an integer followed by zero, one or two pairs of parenthesis. The integer represents the root's value and a pair of parenthesis contains a child binary tree with the same structure.
You always start to construct the left child node of the parent first if it exists.

这篇博客详细介绍了如何根据由括号和整数组成的字符串来构建二叉树。作者首先解析输入字符串,以整数创建根节点,并依据括号递归构建左右子树。特别地,处理了根节点值可能为负的情况。通过遍历字符串,遇到'('表示开始构建子树,')'表示结束。解题过程中注意先构建左子树,若有需要再构建右子树。最后返回构建完成的根节点。
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