find-all-good-indices

Find All Good Indices

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goodIndices

You are given a 0-indexed integer array <code>nums</code> of size <code>n</code> and a positive integer <code>k</code>.

We call an index <code>i</code> in the range <code>k &lt;= i &lt; n - k</code> good if the following conditions are satisfied:

<ul>
	<li>The <code>k</code> elements that are just before the index <code>i</code> are in non-increasing order.</li>
	<li>The <code>k</code> elements that are just after the index <code>i</code> are in non-decreasing order.</li>
</ul>

Return an array of all good indices sorted in increasing order.

&nbsp;
Example 1:

<pre>
Input: nums = [2,1,1,1,3,4,1], k = 2
Output: [2,3]
Explanation: There are two good indices in the array:
- Index 2. The subarray [2,1] is in non-increasing order, and the subarray [1,3] is in non-decreasing order.
- Index 3. The subarray [1,1] is in non-increasing order, and the subarray [3,4] is in non-decreasing order.
Note that the index 4 is not good because [4,1] is not non-decreasing.</pre>

Example 2:

<pre>
Input: nums = [2,1,1,2], k = 2
Output: []
Explanation: There are no good indices in this array.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>n == nums.length</code></li>
	<li><code>3 &lt;= n &lt;= 105</code></li>
	<li><code>1 &lt;= nums[i] &lt;= 106</code></li>
	<li><code>1 &lt;= k &lt;= n / 2</code></li>
</ul>

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