shortest-unsorted-continuous-subarray

Algorithms

Shortest Unsorted Continuous Subarray

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findUnsortedSubarray

Given an integer array <code>nums</code>, you need to find one continuous subarray such that if you only sort this subarray in non-decreasing order, then the whole array will be sorted in non-decreasing order.

Return the shortest such subarray and output its length.

&nbsp;
Example 1:

<pre>
Input: nums = [2,6,4,8,10,9,15]
Output: 5
Explanation: You need to sort [6, 4, 8, 10, 9] in ascending order to make the whole array sorted in ascending order.
</pre>

Example 2:

<pre>
Input: nums = [1,2,3,4]
Output: 0
</pre>

Example 3:

<pre>
Input: nums = [1]
Output: 0
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 104</code></li>
	<li><code>-105 &lt;= nums[i] &lt;= 105</code></li>
</ul>

&nbsp;
Follow up: Can you solve it in <code>O(n)</code> time complexity?

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