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Given a string s consists of upper/lower-case alphabets and empty space characters '  ', return the length of last word in the string. If the last word does not exist, return 0. Note: A word is defi...

原题： Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"],  Return: [   ["ate", "eat","tea"],   [&quot