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题目： Implement a MapSum class with insert, and sum methods. For the method insert, you'll be given a pair of (string, integer). The string represents t 阅读全文
摘要：
题目： Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Input: "aba" Output: True 阅读全文
摘要：
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