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Find the peak index of a given array | Function to find the peak index for the given array.
Base Case.
Check for strictly increasing array.
If the strictly increasing condition is violated , then break.
Stores the value of i , which is a potential peak index.
Second traversal , for strictly decreasing array.
When the strictly decreasing condition is violated , then break.
If i = N - 1 , it means that ans is the peak index.
Otherwise , peak index doesn 't exist.
Driver Code"
Solution in Python:

What is a code to find the peak index of a given array and the other steps required?
assistant
#Here is code to find the peak index of a given array and the other steps required.
 def peakIndex ( arr ) :
	N = len ( arr )
	if ( len ( arr ) < 3 ) :
		return - 1
	i = 0
	while ( i + 1 < N ) :
		if ( arr [ i + 1 ] < arr [ i ] or arr [ i ] == arr [ i + 1 ] ) :
			break
		i += 1
	if ( i == 0 or i == N - 1 ) :
		return - 1
	ans = i
	while ( i < N - 1 ) :
		if ( arr [ i ] < arr [ i + 1 ] or arr [ i ] == arr [ i + 1 ] ) :
			break
		i += 1
	if ( i == N - 1 ) :
		return ans
	return - 1
if __name__ == ' _ _ main _ _ ' :
	arr = [ 0 , 1 , 0 ]
	print ( peakIndex ( arr ) )