<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 &gt;= 3</code></li>
	<li>There exists some <code>i</code> with <code>0 &lt; i &lt; arr.length - 1</code> such that:
	<ul>
		<li><code>arr[0] &lt; arr[1] &lt; ... &lt; arr[i - 1] &lt; arr[i] </code></li>
		<li><code>arr[i] &gt; arr[i + 1] &gt; ... &gt; arr[arr.length - 1]</code></li>
	</ul>
	</li>
</ul>
<img src="https://assets.leetcode.com/uploads/2019/10/20/hint_valid_mountain_array.png" width="500" />
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> arr = [2,1]
<strong>Output:</strong> false
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> arr = [3,5,5]
<strong>Output:</strong> false
</pre><p><strong class="example">Example 3:</strong></p>
<pre><strong>Input:</strong> arr = [0,3,2,1]
<strong>Output:</strong> true
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= arr.length &lt;= 10<sup>4</sup></code></li>
	<li><code>0 &lt;= arr[i] &lt;= 10<sup>4</sup></code></li>
</ul>

class Solution:
    def validMountainArray(self, arr: List[int]) -> bool:
        if len(arr)<3:
            return False
#         runner = 1
#         left_flag = right_flag = False
#         while runner < len(arr) -1:
#             if arr[runner-1] < arr[runner]:
#                 runner += 1
#                 left_flag = True
#             else:
#                 break
#         runner -= 1
#         print(runner)
#         while runner < len(arr)-1:
#             if arr[runner]<=arr[runner+1]:
#                 return False
#             runner +=1
#             right_flag = True
            
#         return True and right_flag and left_flag
        index = arr.index(max(arr))
        if index == len(arr) -1 or index == 0:
            return False
        for i in range(1,index+1):
            if arr[i-1] >= arr[i]:
                return False
    
        for i in range(index,len(arr)-1):
            if arr[i] <= arr[i+1]:
                return False
        return True
17900