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题目描述 Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies nums b 阅读全文
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题目描述 Additive number is a string whose digits can form additive sequence. A valid additive sequence should contain at least three numbers. Except for 阅读全文
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题目描述 Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results. Note: The input string may 阅读全文