missing-number

Missing Number

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missingNumber

Given an array <code>nums</code> containing <code>n</code> distinct numbers in the range <code>[0, n]</code>, return the only number in the range that is missing from the array.

&nbsp;
Example 1:

<pre>
Input: nums = [3,0,1]
Output: 2
Explanation: n = 3 since there are 3 numbers, so all numbers are in the range [0,3]. 2 is the missing number in the range since it does not appear in nums.
</pre>

Example 2:

<pre>
Input: nums = [0,1]
Output: 2
Explanation: n = 2 since there are 2 numbers, so all numbers are in the range [0,2]. 2 is the missing number in the range since it does not appear in nums.
</pre>

Example 3:

<pre>
Input: nums = [9,6,4,2,3,5,7,0,1]
Output: 8
Explanation: n = 9 since there are 9 numbers, so all numbers are in the range [0,9]. 8 is the missing number in the range since it does not appear in nums.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>n == nums.length</code></li>
	<li><code>1 &lt;= n &lt;= 104</code></li>
	<li><code>0 &lt;= nums[i] &lt;= n</code></li>
	<li>All the numbers of <code>nums</code> are unique.</li>
</ul>

&nbsp;
Follow up: Could you implement a solution using only <code>O(1)</code> extra space complexity and <code>O(n)</code> runtime complexity?

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