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Valid Mountain Array ( Google )

 Problem :-

Given  an  array  A  of  integers ,  return  true  if  and  only  if  it  is  a  valid  mountain  Array ,  otherwise  return  false .

☝ Sample Input :-  [ 0 , 2 , 3 , 4 , 5 , 2 , 1 ]

Sample Output :-  true

✌ Sample Input :-  [ 0 , 2 , 3 , 4 , 5  ]

Sample Output :-  false

 Explanation :-






Solution : -

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 public class Mountain
 {
	public static void main(String[] args) {
		int[] arr = { 0, 2, 3, 4, 5, 2, 1 } ;
		System.out.println(validMountain(arr)) ;
	}
	public static boolean validMountain(int[] arr) {
	    int i = 0, n = arr.length-1;
	    while(i<n && arr[i]<arr[i+1]) 
	       i++;
	    if(i==0 || i==n)
	       return false;
	    while(i<n && arr[i]>arr[i+1])
	       i++;
	    return i==n;
	}
 }


def validMountain(arr):
    i = 0
    n = len(arr)-1
    
    while i<n and arr[i]<arr[i+1]:
        i+=1
    
    if i==0 or i==n:
        return False
      
    while i<n and arr[i]>arr[i+1]:
        i+=1
      
    return i==n


arr = [ 0, 2, 3, 4, 5 ]
print(validMountain(arr))




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