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Algorithms

Given an array of&nbsp;integers <code>arr</code> and an integer <code>d</code>. In one step you can jump from index <code>i</code> to index:

<ul>
	<li><code>i + x</code> where:&nbsp;<code>i + x &lt; arr.length</code> and <code> 0 &lt;&nbsp;x &lt;= d</code>.</li>
	<li><code>i - x</code> where:&nbsp;<code>i - x &gt;= 0</code> and <code> 0 &lt;&nbsp;x &lt;= d</code>.</li>
</ul>

In addition, you can only jump from index <code>i</code> to index <code>j</code>&nbsp;if <code>arr[i] &gt; arr[j]</code> and <code>arr[i] &gt; arr[k]</code> for all indices <code>k</code> between <code>i</code> and <code>j</code> (More formally <code>min(i,&nbsp;j) &lt; k &lt; max(i, j)</code>).

You can choose any index of the array and start jumping. Return the maximum number of indices&nbsp;you can visit.

Notice that you can not jump outside of the array at any time.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2020/01/23/meta-chart.jpeg" style="width: 633px; height: 419px;" />
<pre>
Input: arr = [6,4,14,6,8,13,9,7,10,6,12], d = 2
Output: 4
Explanation: You can start at index 10. You can jump 10 --&gt; 8 --&gt; 6 --&gt; 7 as shown.
Note that if you start at index 6 you can only jump to index 7. You cannot jump to index 5 because 13 &gt; 9. You cannot jump to index 4 because index 5 is between index 4 and 6 and 13 &gt; 9.
Similarly You cannot jump from index 3 to index 2 or index 1.
</pre>

Example 2:

<pre>
Input: arr = [3,3,3,3,3], d = 3
Output: 1
Explanation: You can start at any index. You always cannot jump to any index.
</pre>

Example 3:

<pre>
Input: arr = [7,6,5,4,3,2,1], d = 1
Output: 7
Explanation: Start at index 0. You can visit all the indicies. 
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= arr.length &lt;= 1000</code></li>
	<li><code>1 &lt;= arr[i] &lt;= 105</code></li>
	<li><code>1 &lt;= d &lt;= arr.length</code></li>
</ul>