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题目 Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A mapping of digit to 阅读全文
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题目一 Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives t 阅读全文
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题目 Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string "". Exa 阅读全文
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题目 You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes con 阅读全文
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题目 Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have 阅读全文