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leetcode-cn/problem (English)/消失的数字(English) [missing-number-lcci].html Normal file
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<p>An array&nbsp;contains all the integers from 0 to n, except for one number which is missing.&nbsp; Write code to find the missing integer. Can you do it in O(n) time?</p>
<p><strong>Note: </strong>This problem is slightly different from the original one the book.</p>
<p><strong>Example 1: </strong></p>
<pre>
<strong>Input: </strong>[3,0,1]
<strong>Output: </strong>2</pre>
<p>&nbsp;</p>
<p><strong>Example 2: </strong></p>
<pre>
<strong>Input: </strong>[9,6,4,2,3,5,7,0,1]
<strong>Output: </strong>8
</pre>