human
Find if a crest is present in the index range [ L , R ] of the given array | Function that returns true if the array contains a crest in the index range [ L , R ].
To keep track of elements which satisfy the Property.
Property is satisfied for the current element.
Cumulative Sum.
If a crest is present in the given index range.
Driver code"
How can the above be solved in Python?
 Write me a code to find if a crest is present in the index range [ L , R ] of the given array and the other steps required?
assistant
#Here is code to find if a crest is present in the index range [ L , R ] of the given array and the other steps required.
 def hasCrest ( arr , n , L , R ) :
	present = [ 0 ] * n ;
	for i in range ( 1 , n - 2 + 1 ) :
		if ( ( arr [ i ] <= arr [ i + 1 ] ) and ( arr [ i ] <= arr [ i - 1 ] ) ) :
			present [ i ] = 1 ;
	for i in range ( 1 , n ) :
		present [ i ] += present [ i - 1 ] ;
	if ( present [ L ] == present [ R - 1 ] ) :
		return True ;
	return False ;
if __name__ == " _ _ main _ _ " :
	arr = [ 2 , 1 , 3 , 5 , 12 , 11 , 7 , 9 ] ;
	N = len ( arr ) ;
	L = 2 ;
	R = 6 ;
	if ( hasCrest ( arr , N , L , R ) ) :
		print ( " Yes " ) ;
	else :
		print ( " No " ) ;