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| 1 | +<h2><a href="https://leetcode.com/problems/missing-number">268. Missing Number</a></h2><h3>Easy</h3><hr><p>Given an array <code>nums</code> containing <code>n</code> distinct numbers in the range <code>[0, n]</code>, return <em>the only number in the range that is missing from the array.</em></p> |
| 2 | + |
| 3 | +<p> </p> |
| 4 | +<p><strong class="example">Example 1:</strong></p> |
| 5 | + |
| 6 | +<pre> |
| 7 | +<strong>Input:</strong> nums = [3,0,1] |
| 8 | +<strong>Output:</strong> 2 |
| 9 | +<strong>Explanation:</strong> 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. |
| 10 | +</pre> |
| 11 | + |
| 12 | +<p><strong class="example">Example 2:</strong></p> |
| 13 | + |
| 14 | +<pre> |
| 15 | +<strong>Input:</strong> nums = [0,1] |
| 16 | +<strong>Output:</strong> 2 |
| 17 | +<strong>Explanation:</strong> 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. |
| 18 | +</pre> |
| 19 | + |
| 20 | +<p><strong class="example">Example 3:</strong></p> |
| 21 | + |
| 22 | +<pre> |
| 23 | +<strong>Input:</strong> nums = [9,6,4,2,3,5,7,0,1] |
| 24 | +<strong>Output:</strong> 8 |
| 25 | +<strong>Explanation:</strong> 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. |
| 26 | +</pre> |
| 27 | + |
| 28 | +<p> </p> |
| 29 | +<p><strong>Constraints:</strong></p> |
| 30 | + |
| 31 | +<ul> |
| 32 | + <li><code>n == nums.length</code></li> |
| 33 | + <li><code>1 <= n <= 10<sup>4</sup></code></li> |
| 34 | + <li><code>0 <= nums[i] <= n</code></li> |
| 35 | + <li>All the numbers of <code>nums</code> are <strong>unique</strong>.</li> |
| 36 | +</ul> |
| 37 | + |
| 38 | +<p> </p> |
| 39 | +<p><strong>Follow up:</strong> Could you implement a solution using only <code>O(1)</code> extra space complexity and <code>O(n)</code> runtime complexity?</p> |
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