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Use max_so_far and max_ending 阅读全文
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Given a collection of intervals, merge all overlapping intervals. For example,Given [1,3],[2,6],[8,10],[15,18],return [1,6],[8,10],[15,18]. The follow 阅读全文
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Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. There are two ways, first use ArrayList to rewrite 阅读全文
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Symmetric Tree Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4 阅读全文