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Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 思想和merge 阅读全文
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Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWordto endWord, s 阅读全文
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Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, add spaces in s to construct a sentence where each word is 阅读全文
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Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following unique pe 阅读全文
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Given a collection of distinct numbers, return all possible permutations. For example,[1,2,3] have the following permutations: [ [1,2,3], [1,3,2], [2, 阅读全文
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Given a collection of integers that might contain duplicates, nums, return all possible subsets. Note: The solution set must not contain duplicate sub 阅读全文
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Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each num 阅读全文
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Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums 阅读全文
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Given a mountain sequence of n integers which increase firstly and then decrease, find the mountain top. Given a mountain sequence of n integers which 阅读全文
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Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For exampl 阅读全文