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摘要：
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 阅读全文
摘要：
An abbreviation of a word follows the form <first letter><number><last letter>. Below are some examples of word abbreviations: Assume you have a dicti 阅读全文
摘要：
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. 阅读全文