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题目： Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, 阅读全文
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题目： Given a non-empty binary tree, find the maximum path sum. For this problem, a path is defined as any sequence of nodes from some starting node to 阅读全文
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题目： Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: Each of the digits 阅读全文
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题目： Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate 阅读全文
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题目： Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations per 阅读全文
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题目： Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assume that the intervals were in 阅读全文
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题目： Given a collection of intervals, merge all overlapping intervals. Example 1: Input: [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6],[8,10],[15,18]] Ex 阅读全文
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题目： In this problem, a rooted tree is a directed graph such that, there is exactly one node (the root) for which all other nodes are descendants of th 阅读全文
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题目： Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path b 阅读全文
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题目： Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where 阅读全文