human
Can you provide a code to number of triangles possible with given lengths of sticks which are powers of 2 and the other steps required given the following:
Number of triangles possible with given lengths of sticks which are powers of 2 | Function to return the number of positive area triangles.
To store the count of total triangles.
To store the count of pairs of sticks with equal lengths.
Back - traverse and count the number of triangles.
Count the number of pairs.
If we have one remaining stick and we have a pair.
Count 1 triangle.
Reduce one pair.
Count the remaining triangles that can be formed.
Driver code"
How can the above be solved in Python?
assistant
#Here is code to number of triangles possible with given lengths of sticks which are powers of 2 and the other steps required.
 def countTriangles ( a , n ) :
	cnt = 0
	pairs = 0
	for i in range ( n - 1 , - 1 , - 1 ) :
		pairs += a [ i ] // 2
		if ( a [ i ] % 2 == 1 and pairs > 0 ) :
			cnt += 1
			pairs -= 1
	cnt += ( 2 * pairs ) // 3
	return cnt
a = [ 1 , 2 , 2 , 2 , 2 ]
n = len ( a )
print ( countTriangles ( a , n ) )