Package g0901_1000.s0941_valid_mountain_array

Class Solution

java.lang.Object

g0901_1000.s0941_valid_mountain_array.Solution

public class Solution
extends Object

941 - Valid Mountain Array.<p>Easy</p> <p>Given an array of integers <code>arr</code>, return <em><code>true</code> if and only if it is a valid mountain array</em>.</p> <p>Recall that arr is a mountain array if and only if:</p> <ul> <li><code>arr.length >= 3</code></li> <li>There exists some <code>i</code> with <code>0 < i < arr.length - 1</code> such that: <ul> <li><code>arr[0] < arr[1] < ... < arr[i - 1] < arr[i]</code></li> <li><code>arr[i] > arr[i + 1] > ... > arr[arr.length - 1]</code></li> </ul> </li> </ul> <p><img src="https://assets.leetcode.com/uploads/2019/10/20/hint_valid_mountain_array.png" alt="" /></p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> arr = [2,1]</p> <p><strong>Output:</strong> false</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> arr = [3,5,5]</p> <p><strong>Output:</strong> false</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> arr = [0,3,2,1]</p> <p><strong>Output:</strong> true</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= arr.length <= 10⁴</code></li> <li><code>0 <= arr[i] <= 10⁴</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	validMountainArray(int[] arr)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

validMountainArray

public boolean validMountainArray(int[] arr)