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Leetcode interview question 17.04 Vanishing numbers

2022-07-02 18:25:00 【I'm not Xiao Haiwa~~~~】

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Array nums Contains from 0 To n All integers of , But one of them is missing . Please write code to find the missing integer . You have a way O(n) Is it finished in time ？

Be careful ： A slight change in the title of the book

Example 1：

 Input ：[3,0,1]
 Output ：2

Example 2：

 Input ：[9,6,4,2
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