mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-11-04 19:53:12 +08:00
53 lines
3.1 KiB
HTML
53 lines
3.1 KiB
HTML
<p>A <strong>critical point</strong> in a linked list is defined as <strong>either</strong> a <strong>local maxima</strong> or a <strong>local minima</strong>.</p>
|
|
|
|
<p>A node is a <strong>local maxima</strong> if the current node has a value <strong>strictly greater</strong> than the previous node and the next node.</p>
|
|
|
|
<p>A node is a <strong>local minima</strong> if the current node has a value <strong>strictly smaller</strong> than the previous node and the next node.</p>
|
|
|
|
<p>Note that a node can only be a local maxima/minima if there exists <strong>both</strong> a previous node and a next node.</p>
|
|
|
|
<p>Given a linked list <code>head</code>, return <em>an array of length 2 containing </em><code>[minDistance, maxDistance]</code><em> where </em><code>minDistance</code><em> is the <strong>minimum distance</strong> between <strong>any two distinct</strong> critical points and </em><code>maxDistance</code><em> is the <strong>maximum distance</strong> between <strong>any two distinct</strong> critical points. If there are <strong>fewer</strong> than two critical points, return </em><code>[-1, -1]</code>.</p>
|
|
|
|
<p> </p>
|
|
<p><strong>Example 1:</strong></p>
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2021/10/13/a1.png" style="width: 148px; height: 55px;" />
|
|
<pre>
|
|
<strong>Input:</strong> head = [3,1]
|
|
<strong>Output:</strong> [-1,-1]
|
|
<strong>Explanation:</strong> There are no critical points in [3,1].
|
|
</pre>
|
|
|
|
<p><strong>Example 2:</strong></p>
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2021/10/13/a2.png" style="width: 624px; height: 46px;" />
|
|
<pre>
|
|
<strong>Input:</strong> head = [5,3,1,2,5,1,2]
|
|
<strong>Output:</strong> [1,3]
|
|
<strong>Explanation:</strong> There are three critical points:
|
|
- [5,3,<strong><u>1</u></strong>,2,5,1,2]: The third node is a local minima because 1 is less than 3 and 2.
|
|
- [5,3,1,2,<u><strong>5</strong></u>,1,2]: The fifth node is a local maxima because 5 is greater than 2 and 1.
|
|
- [5,3,1,2,5,<u><strong>1</strong></u>,2]: The sixth node is a local minima because 1 is less than 5 and 2.
|
|
The minimum distance is between the fifth and the sixth node. minDistance = 6 - 5 = 1.
|
|
The maximum distance is between the third and the sixth node. maxDistance = 6 - 3 = 3.
|
|
</pre>
|
|
|
|
<p><strong>Example 3:</strong></p>
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2021/10/14/a5.png" style="width: 624px; height: 39px;" />
|
|
<pre>
|
|
<strong>Input:</strong> head = [1,3,2,2,3,2,2,2,7]
|
|
<strong>Output:</strong> [3,3]
|
|
<strong>Explanation:</strong> There are two critical points:
|
|
- [1,<u><strong>3</strong></u>,2,2,3,2,2,2,7]: The second node is a local maxima because 3 is greater than 1 and 2.
|
|
- [1,3,2,2,<u><strong>3</strong></u>,2,2,2,7]: The fifth node is a local maxima because 3 is greater than 2 and 2.
|
|
Both the minimum and maximum distances are between the second and the fifth node.
|
|
Thus, minDistance and maxDistance is 5 - 2 = 3.
|
|
Note that the last node is not considered a local maxima because it does not have a next node.
|
|
</pre>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li>The number of nodes in the list is in the range <code>[2, 10<sup>5</sup>]</code>.</li>
|
|
<li><code>1 <= Node.val <= 10<sup>5</sup></code></li>
|
|
</ul>
|